Merge pull request #20 from gogrlx/cd/exhaustive-containertests

test: exhaustive integration tests + codecov

.github/workflows/integration.yml

@@ -16,7 +16,11 @@ jobs:
           go-version-file: go.mod
       - run: go build ./...
       - run: go vet ./...
-      - run: go test -race ./...
+      - run: go test -race -coverprofile=coverage-unit.out ./...
+      - uses: actions/upload-artifact@v4
+        with:
+          name: coverage-unit
+          path: coverage-unit.out
 
   debian:
     name: Debian (apt)
@@ -32,7 +36,12 @@ jobs:
           apt-get update
           apt-get install -y sudo tree curl
       - name: Integration tests
-        run: go test -v -tags integration -count=1 ./apt/ ./dpkg/ ./detect/
+        run: go test -v -tags integration -count=1 -coverprofile=coverage-debian.out ./apt/ ./dpkg/ ./detect/
+      - uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          name: coverage-debian
+          path: coverage-debian.out
 
   ubuntu:
     name: Ubuntu (apt + snap)
@@ -48,9 +57,14 @@ jobs:
           sudo apt-get install -y tree
           sudo snap install hello-world 2>/dev/null; sudo snap remove hello-world 2>/dev/null
       - name: Integration tests (apt)
-        run: sudo -E go test -v -tags integration -count=1 ./apt/ ./dpkg/ ./detect/
+        run: sudo -E go test -v -tags integration -count=1 -coverprofile=coverage-ubuntu-apt.out ./apt/ ./dpkg/ ./detect/
       - name: Integration tests (snap)
-        run: sudo -E go test -v -tags integration -count=1 ./snap/
+        run: sudo -E go test -v -tags integration -count=1 -coverprofile=coverage-ubuntu-snap.out ./snap/
+      - uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          name: coverage-ubuntu
+          path: coverage-ubuntu-*.out
 
   fedora-dnf4:
     name: Fedora 39 (dnf4)
@@ -65,7 +79,12 @@ jobs:
         run: |
           dnf install -y tree sudo
       - name: Integration tests
-        run: go test -v -tags integration -count=1 ./dnf/ ./rpm/ ./detect/
+        run: go test -v -tags integration -count=1 -coverprofile=coverage-fedora39.out ./dnf/ ./rpm/ ./detect/
+      - uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          name: coverage-fedora39
+          path: coverage-fedora39.out
 
   fedora-dnf5:
     name: Fedora latest (dnf5)
@@ -80,7 +99,12 @@ jobs:
         run: |
           dnf install -y tree sudo
       - name: Integration tests
-        run: go test -v -tags integration -count=1 ./dnf/ ./rpm/ ./detect/
+        run: go test -v -tags integration -count=1 -coverprofile=coverage-fedora-latest.out ./dnf/ ./rpm/ ./detect/
+      - uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          name: coverage-fedora-latest
+          path: coverage-fedora-latest.out
 
   alpine:
     name: Alpine (apk)
@@ -95,7 +119,12 @@ jobs:
         run: |
           apk add --no-cache sudo tree bash
       - name: Integration tests
-        run: go test -v -tags integration -count=1 ./apk/ ./detect/
+        run: go test -v -tags integration -count=1 -coverprofile=coverage-alpine.out ./apk/ ./detect/
+      - uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          name: coverage-alpine
+          path: coverage-alpine.out
 
   arch:
     name: Arch Linux (pacman)
@@ -111,7 +140,12 @@ jobs:
           pacman -Syu --noconfirm
           pacman -S --noconfirm sudo tree
       - name: Integration tests
-        run: go test -v -tags integration -count=1 ./pacman/ ./detect/
+        run: go test -v -tags integration -count=1 -coverprofile=coverage-arch.out ./pacman/ ./detect/
+      - uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          name: coverage-arch
+          path: coverage-arch.out
 
   flatpak:
     name: Ubuntu + Flatpak
@@ -130,4 +164,29 @@ jobs:
           sudo apt-get install -y flatpak
           sudo flatpak remote-add --if-not-exists flathub https://dl.flathub.org/repo/flathub.flatpakrepo
       - name: Integration tests
-        run: sudo -E go test -v -tags integration -count=1 ./flatpak/
+        run: sudo -E go test -v -tags integration -count=1 -coverprofile=coverage-flatpak.out ./flatpak/
+      - uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          name: coverage-flatpak
+          path: coverage-flatpak.out
+
+  codecov:
+    name: Upload Coverage
+    runs-on: ubuntu-latest
+    needs: [unit-tests, debian, ubuntu, fedora-dnf4, fedora-dnf5, alpine, arch, flatpak]
+    if: always()
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/download-artifact@v4
+        with:
+          pattern: coverage-*
+          merge-multiple: true
+      - name: List coverage files
+        run: ls -la coverage-*.out 2>/dev/null || echo "No coverage files found"
+      - uses: codecov/codecov-action@v5
+        with:
+          files: coverage-unit.out,coverage-debian.out,coverage-ubuntu-apt.out,coverage-ubuntu-snap.out,coverage-fedora39.out,coverage-fedora-latest.out,coverage-alpine.out,coverage-arch.out,coverage-flatpak.out
+          fail_ci_if_error: false
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}

.gitignore

@@ -0,0 +1,2 @@
+coverage.out
+coverage.html

apk/apk_integration_test.go

@@ -19,89 +19,245 @@ func TestIntegration_Apk(t *testing.T) {
 	}
 	ctx := context.Background()
 
+	assert.Equal(t, "apk", mgr.Name())
+
+	caps := snack.GetCapabilities(mgr)
+	assert.True(t, caps.VersionQuery, "apk should support VersionQuery")
+	assert.True(t, caps.Clean, "apk should support Clean")
+	assert.True(t, caps.FileOwnership, "apk should support FileOwnership")
+	assert.False(t, caps.Hold, "apk should not support Hold")
+	assert.False(t, caps.RepoManagement, "apk should not support RepoManagement")
+	assert.False(t, caps.KeyManagement, "apk should not support KeyManagement")
+	assert.False(t, caps.Groups, "apk should not support Groups")
+	assert.False(t, caps.NameNormalize, "apk should not support NameNormalize")
+
 	t.Run("Update", func(t *testing.T) {
-		err := mgr.Update(ctx)
-		require.NoError(t, err)
+		require.NoError(t, mgr.Update(ctx))
 	})
 
 	t.Run("Search", func(t *testing.T) {
 		pkgs, err := mgr.Search(ctx, "curl")
 		require.NoError(t, err)
-		require.NotEmpty(t, pkgs)
+		require.NotEmpty(t, pkgs, "search for curl should return results")
+
+		found := false
+		for _, p := range pkgs {
+			if p.Name == "curl" {
+				found = true
+				break
+			}
+		}
+		assert.True(t, found, "curl should appear in search results")
 	})
 
-	t.Run("Info", func(t *testing.T) {
-		// apk info only works on installed packages, use "tree" after install
-		// or test with a pre-installed package like "busybox"
+	t.Run("Search_NoResults", func(t *testing.T) {
+		pkgs, err := mgr.Search(ctx, "xyznonexistentpackage999")
+		// apk search may return error or empty results for no matches
+		if err == nil {
+			assert.Empty(t, pkgs)
+		}
+	})
+
+	t.Run("Info_PreInstalled", func(t *testing.T) {
 		pkg, err := mgr.Info(ctx, "busybox")
 		if err != nil {
-			t.Skip("busybox not installed, skipping Info test")
+			t.Skip("busybox not installed")
 		}
 		require.NotNil(t, pkg)
+		assert.Equal(t, "busybox", pkg.Name)
+		assert.NotEmpty(t, pkg.Version)
 	})
 
-	t.Run("Install", func(t *testing.T) {
-		err := mgr.Install(ctx, snack.Targets("tree"), snack.WithSudo(), snack.WithAssumeYes())
+	t.Run("Info_NotFound", func(t *testing.T) {
+		_, err := mgr.Info(ctx, "xyznonexistentpackage999")
+		assert.Error(t, err)
+	})
+
+	t.Run("Install_Single", func(t *testing.T) {
+		_ = mgr.Remove(ctx, snack.Targets("tree"))
+		err := mgr.Install(ctx, snack.Targets("tree"))
 		require.NoError(t, err)
 	})
 
-	t.Run("IsInstalled", func(t *testing.T) {
+	t.Run("IsInstalled_True", func(t *testing.T) {
 		installed, err := mgr.IsInstalled(ctx, "tree")
 		require.NoError(t, err)
 		assert.True(t, installed)
 	})
 
-	t.Run("Version", func(t *testing.T) {
+	t.Run("IsInstalled_False", func(t *testing.T) {
+		installed, err := mgr.IsInstalled(ctx, "xyznonexistentpackage999")
+		require.NoError(t, err)
+		assert.False(t, installed)
+	})
+
+	t.Run("Version_Installed", func(t *testing.T) {
 		ver, err := mgr.Version(ctx, "tree")
 		require.NoError(t, err)
 		assert.NotEmpty(t, ver)
+		t.Logf("tree version: %s", ver)
 	})
 
-	t.Run("List", func(t *testing.T) {
+	t.Run("Version_NotInstalled", func(t *testing.T) {
+		_, err := mgr.Version(ctx, "xyznonexistentpackage999")
+		assert.Error(t, err)
+	})
+
+	t.Run("List_ContainsInstalled", func(t *testing.T) {
 		pkgs, err := mgr.List(ctx)
 		require.NoError(t, err)
+		require.NotEmpty(t, pkgs)
+
 		found := false
 		for _, p := range pkgs {
 			if p.Name == "tree" {
 				found = true
+				assert.NotEmpty(t, p.Version)
 				break
 			}
 		}
 		assert.True(t, found, "tree should be in installed list")
 	})
 
-	t.Run("Remove", func(t *testing.T) {
-		err := mgr.Remove(ctx, snack.Targets("tree"), snack.WithSudo(), snack.WithAssumeYes())
+	t.Run("Info_AfterInstall", func(t *testing.T) {
+		pkg, err := mgr.Info(ctx, "tree")
 		require.NoError(t, err)
+		require.NotNil(t, pkg)
+		assert.Equal(t, "tree", pkg.Name)
+		assert.NotEmpty(t, pkg.Version)
 	})
 
-	t.Run("IsInstalled_After_Remove", func(t *testing.T) {
+	t.Run("Install_Multiple", func(t *testing.T) {
+		err := mgr.Install(ctx, snack.Targets("tree", "less"))
+		require.NoError(t, err)
+
+		for _, pkg := range []string{"tree", "less"} {
+			installed, err := mgr.IsInstalled(ctx, pkg)
+			require.NoError(t, err)
+			assert.True(t, installed, "%s should be installed", pkg)
+		}
+	})
+
+	t.Run("Purge", func(t *testing.T) {
+		// apk purge is same as remove
+		err := mgr.Purge(ctx, snack.Targets("less"))
+		require.NoError(t, err)
+
+		installed, err := mgr.IsInstalled(ctx, "less")
+		require.NoError(t, err)
+		assert.False(t, installed)
+	})
+
+	t.Run("Remove", func(t *testing.T) {
+		err := mgr.Remove(ctx, snack.Targets("tree"))
+		require.NoError(t, err)
+
 		installed, err := mgr.IsInstalled(ctx, "tree")
 		require.NoError(t, err)
 		assert.False(t, installed)
 	})
 
-	t.Run("Capabilities", func(t *testing.T) {
-		if vq, ok := mgr.(snack.VersionQuerier); ok {
-			ver, err := vq.LatestVersion(ctx, "busybox")
+	// --- VersionQuerier ---
+	t.Run("VersionQuerier", func(t *testing.T) {
+		vq, ok := mgr.(snack.VersionQuerier)
+		require.True(t, ok)
+
+		t.Run("LatestVersion", func(t *testing.T) {
+			ver, err := vq.LatestVersion(ctx, "curl")
 			require.NoError(t, err)
 			assert.NotEmpty(t, ver)
+			t.Logf("curl latest: %s", ver)
+		})
 
-			upgrades, err := vq.ListUpgrades(ctx)
+		t.Run("LatestVersion_NotFound", func(t *testing.T) {
+			_, err := vq.LatestVersion(ctx, "xyznonexistentpackage999")
+			assert.Error(t, err)
+		})
+
+		t.Run("ListUpgrades", func(t *testing.T) {
+			pkgs, err := vq.ListUpgrades(ctx)
 			require.NoError(t, err)
-			_ = upgrades
-		}
+			t.Logf("upgradable packages: %d", len(pkgs))
+		})
 
-		if cl, ok := mgr.(snack.Cleaner); ok {
+		t.Run("UpgradeAvailable", func(t *testing.T) {
+			avail, err := vq.UpgradeAvailable(ctx, "busybox")
+			require.NoError(t, err)
+			_ = avail
+		})
+
+		t.Run("VersionCmp", func(t *testing.T) {
+			tests := []struct {
+				v1, v2 string
+				want   int
+			}{
+				{"1.0.0-r0", "1.0.0-r1", -1},
+				{"2.0.0-r0", "1.0.0-r0", 1},
+				{"1.0.0-r0", "1.0.0-r0", 0},
+			}
+			for _, tt := range tests {
+				cmp, err := vq.VersionCmp(ctx, tt.v1, tt.v2)
+				require.NoError(t, err, "VersionCmp(%s, %s)", tt.v1, tt.v2)
+				assert.Equal(t, tt.want, cmp, "VersionCmp(%s, %s)", tt.v1, tt.v2)
+			}
+		})
+	})
+
+	// --- Cleaner ---
+	t.Run("Cleaner", func(t *testing.T) {
+		cl, ok := mgr.(snack.Cleaner)
+		require.True(t, ok)
+
+		t.Run("Autoremove", func(t *testing.T) {
+			// apk doesn't have autoremove but we exercise the path
+			err := cl.Autoremove(ctx)
+			// May or may not be supported
+			_ = err
+		})
+
+		t.Run("Clean", func(t *testing.T) {
 			err := cl.Clean(ctx)
 			require.NoError(t, err)
-		}
+		})
+	})
 
-		if fo, ok := mgr.(snack.FileOwner); ok {
-			owner, err := fo.Owner(ctx, "/usr/bin/apk")
-			if err == nil {
-				assert.NotEmpty(t, owner)
-			}
-		}
+	// --- FileOwner ---
+	t.Run("FileOwner", func(t *testing.T) {
+		fo, ok := mgr.(snack.FileOwner)
+		require.True(t, ok)
+
+		// Install tree for file tests
+		_ = mgr.Install(ctx, snack.Targets("tree"))
+
+		t.Run("FileList", func(t *testing.T) {
+			files, err := fo.FileList(ctx, "tree")
+			require.NoError(t, err)
+			require.NotEmpty(t, files)
+			t.Logf("tree files: %d", len(files))
+		})
+
+		t.Run("FileList_NotInstalled", func(t *testing.T) {
+			_, err := fo.FileList(ctx, "xyznonexistentpackage999")
+			assert.Error(t, err)
+		})
+
+		t.Run("Owner", func(t *testing.T) {
+			owner, err := fo.Owner(ctx, "/usr/bin/tree")
+			require.NoError(t, err)
+			assert.Contains(t, owner, "tree")
+		})
+
+		t.Run("Owner_NotFound", func(t *testing.T) {
+			_, err := fo.Owner(ctx, "/nonexistent/path/xyz")
+			assert.Error(t, err)
+		})
+
+		_ = mgr.Remove(ctx, snack.Targets("tree"))
+	})
+
+	// --- Upgrade ---
+	t.Run("Upgrade", func(t *testing.T) {
+		err := mgr.Upgrade(ctx)
+		require.NoError(t, err)
 	})
 }

apt/apt_integration_test.go

@@ -19,86 +19,355 @@ func TestIntegration_Apt(t *testing.T) {
 	}
 	ctx := context.Background()
 
+	// Verify Name
+	assert.Equal(t, "apt", mgr.Name())
+
+	// Verify capabilities reported correctly
+	caps := snack.GetCapabilities(mgr)
+	assert.True(t, caps.VersionQuery, "apt should support VersionQuery")
+	assert.True(t, caps.Hold, "apt should support Hold")
+	assert.True(t, caps.Clean, "apt should support Clean")
+	assert.True(t, caps.FileOwnership, "apt should support FileOwnership")
+	assert.True(t, caps.RepoManagement, "apt should support RepoManagement")
+	assert.True(t, caps.KeyManagement, "apt should support KeyManagement")
+	assert.True(t, caps.NameNormalize, "apt should support NameNormalize")
+	assert.False(t, caps.Groups, "apt should not support Groups")
+
 	t.Run("Update", func(t *testing.T) {
-		err := mgr.Update(ctx)
-		require.NoError(t, err)
+		require.NoError(t, mgr.Update(ctx))
 	})
 
 	t.Run("Search", func(t *testing.T) {
 		pkgs, err := mgr.Search(ctx, "curl")
 		require.NoError(t, err)
-		require.NotEmpty(t, pkgs)
+		require.NotEmpty(t, pkgs, "search for curl should return results")
+
+		// Verify Package struct fields are populated
+		found := false
+		for _, p := range pkgs {
+			if p.Name == "curl" {
+				found = true
+				assert.NotEmpty(t, p.Description, "curl should have a description")
+				break
+			}
+		}
+		assert.True(t, found, "curl should appear in search results")
+	})
+
+	t.Run("Search_NoResults", func(t *testing.T) {
+		pkgs, err := mgr.Search(ctx, "xyznonexistentpackage999")
+		require.NoError(t, err)
+		assert.Empty(t, pkgs)
 	})
 
 	t.Run("Info", func(t *testing.T) {
-		pkg, err := mgr.Info(ctx, "curl")
+		pkg, err := mgr.Info(ctx, "bash")
 		require.NoError(t, err)
 		require.NotNil(t, pkg)
-		assert.Equal(t, "curl", pkg.Name)
+		assert.Equal(t, "bash", pkg.Name)
+		assert.NotEmpty(t, pkg.Version)
 	})
 
-	t.Run("Install", func(t *testing.T) {
-		err := mgr.Install(ctx, snack.Targets("tree"), snack.WithSudo(), snack.WithAssumeYes())
+	t.Run("Info_NotFound", func(t *testing.T) {
+		_, err := mgr.Info(ctx, "xyznonexistentpackage999")
+		assert.Error(t, err)
+	})
+
+	t.Run("Install_Single", func(t *testing.T) {
+		// Remove first to ensure clean state
+		_ = mgr.Remove(ctx, snack.Targets("tree"), snack.WithAssumeYes())
+
+		err := mgr.Install(ctx, snack.Targets("tree"), snack.WithAssumeYes())
 		require.NoError(t, err)
 	})
 
-	t.Run("IsInstalled", func(t *testing.T) {
+	t.Run("IsInstalled_True", func(t *testing.T) {
 		installed, err := mgr.IsInstalled(ctx, "tree")
 		require.NoError(t, err)
 		assert.True(t, installed)
 	})
 
-	t.Run("Version", func(t *testing.T) {
+	t.Run("IsInstalled_False", func(t *testing.T) {
+		installed, err := mgr.IsInstalled(ctx, "xyznonexistentpackage999")
+		require.NoError(t, err)
+		assert.False(t, installed)
+	})
+
+	t.Run("Version_Installed", func(t *testing.T) {
 		ver, err := mgr.Version(ctx, "tree")
 		require.NoError(t, err)
 		assert.NotEmpty(t, ver)
+		t.Logf("tree version: %s", ver)
 	})
 
-	t.Run("List", func(t *testing.T) {
+	t.Run("Version_NotInstalled", func(t *testing.T) {
+		_, err := mgr.Version(ctx, "xyznonexistentpackage999")
+		assert.Error(t, err)
+	})
+
+	t.Run("List_ContainsInstalled", func(t *testing.T) {
 		pkgs, err := mgr.List(ctx)
 		require.NoError(t, err)
+		require.NotEmpty(t, pkgs)
+
 		found := false
 		for _, p := range pkgs {
 			if p.Name == "tree" {
 				found = true
+				assert.NotEmpty(t, p.Version)
+				assert.True(t, p.Installed)
 				break
 			}
 		}
 		assert.True(t, found, "tree should be in installed list")
 	})
 
-	t.Run("Remove", func(t *testing.T) {
-		err := mgr.Remove(ctx, snack.Targets("tree"), snack.WithSudo(), snack.WithAssumeYes())
+	t.Run("Install_WithVersion", func(t *testing.T) {
+		// Get current version and reinstall with explicit version
+		ver, err := mgr.Version(ctx, "tree")
 		require.NoError(t, err)
+
+		err = mgr.Install(ctx, []snack.Target{{Name: "tree", Version: ver}}, snack.WithAssumeYes())
+		// Should succeed (already installed at that version) or be a no-op
+		// Some apt versions may return success, others may note it's already installed
+		_ = err
 	})
 
-	t.Run("IsInstalled_After_Remove", func(t *testing.T) {
+	t.Run("Purge", func(t *testing.T) {
+		// Install then purge (removes config files too)
+		_ = mgr.Install(ctx, snack.Targets("tree"), snack.WithAssumeYes())
+		err := mgr.Purge(ctx, snack.Targets("tree"), snack.WithAssumeYes())
+		require.NoError(t, err)
+
 		installed, err := mgr.IsInstalled(ctx, "tree")
 		require.NoError(t, err)
 		assert.False(t, installed)
 	})
 
-	t.Run("Capabilities", func(t *testing.T) {
-		if vq, ok := mgr.(snack.VersionQuerier); ok {
+	t.Run("Install_Multiple", func(t *testing.T) {
+		err := mgr.Install(ctx, snack.Targets("tree", "less"), snack.WithAssumeYes())
+		require.NoError(t, err)
+
+		for _, pkg := range []string{"tree", "less"} {
+			installed, err := mgr.IsInstalled(ctx, pkg)
+			require.NoError(t, err)
+			assert.True(t, installed, "%s should be installed", pkg)
+		}
+	})
+
+	t.Run("Remove", func(t *testing.T) {
+		err := mgr.Remove(ctx, snack.Targets("tree"), snack.WithAssumeYes())
+		require.NoError(t, err)
+
+		installed, err := mgr.IsInstalled(ctx, "tree")
+		require.NoError(t, err)
+		assert.False(t, installed)
+	})
+
+	// --- VersionQuerier ---
+	t.Run("VersionQuerier", func(t *testing.T) {
+		vq, ok := mgr.(snack.VersionQuerier)
+		require.True(t, ok, "apt must implement VersionQuerier")
+
+		t.Run("LatestVersion", func(t *testing.T) {
 			ver, err := vq.LatestVersion(ctx, "curl")
 			require.NoError(t, err)
 			assert.NotEmpty(t, ver)
+			t.Logf("curl latest: %s", ver)
+		})
 
-			upgrades, err := vq.ListUpgrades(ctx)
+		t.Run("LatestVersion_NotFound", func(t *testing.T) {
+			_, err := vq.LatestVersion(ctx, "xyznonexistentpackage999")
+			assert.Error(t, err)
+		})
+
+		t.Run("ListUpgrades", func(t *testing.T) {
+			pkgs, err := vq.ListUpgrades(ctx)
 			require.NoError(t, err)
-			_ = upgrades
-		}
+			// May be empty in a freshly updated container, that's fine
+			t.Logf("upgradable packages: %d", len(pkgs))
+			for _, p := range pkgs {
+				assert.NotEmpty(t, p.Name)
+				assert.NotEmpty(t, p.Version)
+			}
+		})
 
-		if cl, ok := mgr.(snack.Cleaner); ok {
+		t.Run("UpgradeAvailable", func(t *testing.T) {
+			// bash is typically at latest in a fresh container
+			avail, err := vq.UpgradeAvailable(ctx, "bash")
+			require.NoError(t, err)
+			_ = avail // just exercising the code path
+		})
+
+		t.Run("VersionCmp", func(t *testing.T) {
+			tests := []struct {
+				v1, v2 string
+				want   int
+			}{
+				{"1.0-1", "1.0-2", -1},
+				{"2.0-1", "1.0-1", 1},
+				{"1.0-1", "1.0-1", 0},
+				{"1:1.0-1", "1.0-1", 1}, // epoch
+			}
+			for _, tt := range tests {
+				cmp, err := vq.VersionCmp(ctx, tt.v1, tt.v2)
+				require.NoError(t, err, "VersionCmp(%s, %s)", tt.v1, tt.v2)
+				assert.Equal(t, tt.want, cmp, "VersionCmp(%s, %s)", tt.v1, tt.v2)
+			}
+		})
+	})
+
+	// --- Holder ---
+	t.Run("Holder", func(t *testing.T) {
+		h, ok := mgr.(snack.Holder)
+		require.True(t, ok, "apt must implement Holder")
+
+		// Ensure tree is installed for hold tests
+		_ = mgr.Install(ctx, snack.Targets("tree"), snack.WithAssumeYes())
+
+		t.Run("Hold", func(t *testing.T) {
+			err := h.Hold(ctx, []string{"tree"})
+			require.NoError(t, err)
+		})
+
+		t.Run("ListHeld", func(t *testing.T) {
+			held, err := h.ListHeld(ctx)
+			require.NoError(t, err)
+			found := false
+			for _, p := range held {
+				if p.Name == "tree" {
+					found = true
+					break
+				}
+			}
+			assert.True(t, found, "tree should be in held list")
+		})
+
+		t.Run("Unhold", func(t *testing.T) {
+			err := h.Unhold(ctx, []string{"tree"})
+			require.NoError(t, err)
+
+			held, err := h.ListHeld(ctx)
+			require.NoError(t, err)
+			for _, p := range held {
+				assert.NotEqual(t, "tree", p.Name, "tree should not be held after unhold")
+			}
+		})
+	})
+
+	// --- Cleaner ---
+	t.Run("Cleaner", func(t *testing.T) {
+		cl, ok := mgr.(snack.Cleaner)
+		require.True(t, ok, "apt must implement Cleaner")
+
+		t.Run("Autoremove", func(t *testing.T) {
+			err := cl.Autoremove(ctx)
+			require.NoError(t, err)
+		})
+
+		t.Run("Clean", func(t *testing.T) {
 			err := cl.Clean(ctx)
 			require.NoError(t, err)
-		}
+		})
+	})
 
-		if fo, ok := mgr.(snack.FileOwner); ok {
-			owner, err := fo.Owner(ctx, "/usr/bin/apt")
-			if err == nil {
-				assert.NotEmpty(t, owner)
+	// --- FileOwner ---
+	t.Run("FileOwner", func(t *testing.T) {
+		fo, ok := mgr.(snack.FileOwner)
+		require.True(t, ok, "apt must implement FileOwner")
+
+		// Ensure tree is installed
+		_ = mgr.Install(ctx, snack.Targets("tree"), snack.WithAssumeYes())
+
+		t.Run("FileList", func(t *testing.T) {
+			files, err := fo.FileList(ctx, "tree")
+			require.NoError(t, err)
+			require.NotEmpty(t, files)
+
+			found := false
+			for _, f := range files {
+				if f == "/usr/bin/tree" {
+					found = true
+					break
+				}
 			}
+			assert.True(t, found, "/usr/bin/tree should be in file list")
+		})
+
+		t.Run("FileList_NotInstalled", func(t *testing.T) {
+			_, err := fo.FileList(ctx, "xyznonexistentpackage999")
+			assert.Error(t, err)
+		})
+
+		t.Run("Owner", func(t *testing.T) {
+			owner, err := fo.Owner(ctx, "/usr/bin/tree")
+			require.NoError(t, err)
+			assert.Contains(t, owner, "tree")
+		})
+
+		t.Run("Owner_NotFound", func(t *testing.T) {
+			_, err := fo.Owner(ctx, "/nonexistent/path/xyz")
+			assert.Error(t, err)
+		})
+	})
+
+	// --- RepoManager ---
+	t.Run("RepoManager", func(t *testing.T) {
+		rm, ok := mgr.(snack.RepoManager)
+		require.True(t, ok, "apt must implement RepoManager")
+
+		t.Run("ListRepos", func(t *testing.T) {
+			repos, err := rm.ListRepos(ctx)
+			require.NoError(t, err)
+			t.Logf("repos: %d", len(repos))
+			// Container may use DEB822 format (.sources) not parsed by current implementation
+		})
+	})
+
+	// --- KeyManager ---
+	t.Run("KeyManager", func(t *testing.T) {
+		km, ok := mgr.(snack.KeyManager)
+		require.True(t, ok, "apt must implement KeyManager")
+
+		t.Run("ListKeys", func(t *testing.T) {
+			keys, err := km.ListKeys(ctx)
+			require.NoError(t, err)
+			// May have keys or not, just exercising the path
+			t.Logf("keys: %d", len(keys))
+		})
+	})
+
+	// --- NameNormalizer ---
+	t.Run("NameNormalizer", func(t *testing.T) {
+		nn, ok := mgr.(snack.NameNormalizer)
+		require.True(t, ok, "apt must implement NameNormalizer")
+
+		tests := []struct {
+			input, wantName, wantArch string
+		}{
+			{"curl:amd64", "curl", "amd64"},
+			{"bash:arm64", "bash", "arm64"},
+			{"python3", "python3", ""},
+		}
+		for _, tt := range tests {
+			t.Run("NormalizeName_"+tt.input, func(t *testing.T) {
+				got := nn.NormalizeName(tt.input)
+				assert.Equal(t, tt.wantName, got)
+			})
+			t.Run("ParseArch_"+tt.input, func(t *testing.T) {
+				name, arch := nn.ParseArch(tt.input)
+				assert.Equal(t, tt.wantName, name)
+				assert.Equal(t, tt.wantArch, arch)
+			})
 		}
 	})
+
+	// --- Upgrade (run last as it may change state) ---
+	t.Run("Upgrade", func(t *testing.T) {
+		err := mgr.Upgrade(ctx, snack.WithAssumeYes())
+		require.NoError(t, err)
+	})
+
+	// Cleanup
+	_ = mgr.Remove(ctx, snack.Targets("tree", "less"), snack.WithAssumeYes())
 }

detect/detect_integration_test.go

@@ -12,18 +12,53 @@ import (
 )
 
 func TestIntegration_Detect(t *testing.T) {
-	mgr, err := detect.Default()
-	require.NoError(t, err)
-	require.NotNil(t, mgr)
-	t.Logf("Detected: %s", mgr.Name())
+	t.Run("Default", func(t *testing.T) {
+		mgr, err := detect.Default()
+		require.NoError(t, err)
+		require.NotNil(t, mgr)
+		assert.NotEmpty(t, mgr.Name())
+		assert.True(t, mgr.Available())
+		t.Logf("Detected default: %s", mgr.Name())
+	})
 
-	all := detect.All()
-	require.NotEmpty(t, all)
-	for _, m := range all {
-		t.Logf("Available: %s", m.Name())
-	}
+	t.Run("All", func(t *testing.T) {
+		all := detect.All()
+		require.NotEmpty(t, all)
+		for _, m := range all {
+			assert.NotEmpty(t, m.Name())
+			assert.True(t, m.Available())
+			t.Logf("Available: %s", m.Name())
+		}
+	})
 
-	caps := snack.GetCapabilities(mgr)
-	t.Logf("Capabilities: %+v", caps)
-	assert.NotEmpty(t, mgr.Name())
+	t.Run("ByName_Valid", func(t *testing.T) {
+		all := detect.All()
+		require.NotEmpty(t, all)
+
+		// Should be able to find each detected manager by name
+		for _, m := range all {
+			found, err := detect.ByName(m.Name())
+			require.NoError(t, err, "ByName(%s)", m.Name())
+			require.NotNil(t, found)
+			assert.Equal(t, m.Name(), found.Name())
+		}
+	})
+
+	t.Run("ByName_Invalid", func(t *testing.T) {
+		_, err := detect.ByName("xyznonexistentmanager999")
+		assert.Error(t, err)
+		assert.ErrorIs(t, err, snack.ErrManagerNotFound)
+	})
+
+	t.Run("Capabilities", func(t *testing.T) {
+		mgr, err := detect.Default()
+		require.NoError(t, err)
+
+		caps := snack.GetCapabilities(mgr)
+		t.Logf("Default manager %s capabilities: %+v", mgr.Name(), caps)
+
+		// Every manager should have at least the base Manager interface
+		// (which isn't in Capabilities, but let's verify some basics)
+		assert.NotEmpty(t, mgr.Name())
+	})
 }

dnf/capabilities.go

@@ -54,7 +54,7 @@ func (d *DNF) Unhold(ctx context.Context, pkgs []string) error {
 
 // ListHeld returns all currently held packages.
 func (d *DNF) ListHeld(ctx context.Context) ([]snack.Package, error) {
-	return listHeld(ctx)
+	return listHeld(ctx, d.v5)
 }
 
 // Autoremove removes orphaned packages.

dnf/capabilities_linux.go

@@ -102,11 +102,14 @@ func unhold(ctx context.Context, pkgs []string) error {
 	return err
 }
 
-func listHeld(ctx context.Context) ([]snack.Package, error) {
+func listHeld(ctx context.Context, v5 bool) ([]snack.Package, error) {
 	out, err := run(ctx, []string{"versionlock", "list"}, snack.Options{})
 	if err != nil {
 		return nil, fmt.Errorf("dnf listHeld: %w", err)
 	}
+	if v5 {
+		return parseVersionLockDNF5(out), nil
+	}
 	return parseVersionLock(out), nil
 }
 

dnf/capabilities_other.go

@@ -32,7 +32,7 @@ func unhold(_ context.Context, _ []string) error {
 	return snack.ErrUnsupportedPlatform
 }
 
-func listHeld(_ context.Context) ([]snack.Package, error) {
+func listHeld(_ context.Context, _ bool) ([]snack.Package, error) {
 	return nil, snack.ErrUnsupportedPlatform
 }
 

dnf/dnf_integration_test.go

@@ -27,104 +27,376 @@ func TestIntegration_DNF(t *testing.T) {
 	}
 	ctx := context.Background()
 
+	assert.Equal(t, "dnf", mgr.Name())
+
+	caps := snack.GetCapabilities(mgr)
+	assert.True(t, caps.VersionQuery, "dnf should support VersionQuery")
+	assert.True(t, caps.Hold, "dnf should support Hold")
+	assert.True(t, caps.Clean, "dnf should support Clean")
+	assert.True(t, caps.FileOwnership, "dnf should support FileOwnership")
+	assert.True(t, caps.RepoManagement, "dnf should support RepoManagement")
+	assert.True(t, caps.KeyManagement, "dnf should support KeyManagement")
+	assert.True(t, caps.Groups, "dnf should support Groups")
+	assert.True(t, caps.NameNormalize, "dnf should support NameNormalize")
+
 	t.Run("Update", func(t *testing.T) {
-		err := mgr.Update(ctx)
-		require.NoError(t, err)
+		require.NoError(t, mgr.Update(ctx))
 	})
 
 	t.Run("Search", func(t *testing.T) {
 		pkgs, err := mgr.Search(ctx, "curl")
 		require.NoError(t, err)
 		require.NotEmpty(t, pkgs)
+
+		found := false
+		for _, p := range pkgs {
+			if p.Name == "curl" {
+				found = true
+				assert.NotEmpty(t, p.Description)
+				break
+			}
+		}
+		assert.True(t, found, "curl should appear in search results")
+	})
+
+	t.Run("Search_NoResults", func(t *testing.T) {
+		pkgs, err := mgr.Search(ctx, "xyznonexistentpackage999")
+		require.NoError(t, err)
+		assert.Empty(t, pkgs)
 	})
 
 	t.Run("Info", func(t *testing.T) {
-		pkg, err := mgr.Info(ctx, "curl")
+		pkg, err := mgr.Info(ctx, "bash")
 		require.NoError(t, err)
 		require.NotNil(t, pkg)
-		assert.Equal(t, "curl", pkg.Name)
+		assert.Equal(t, "bash", pkg.Name)
+		assert.NotEmpty(t, pkg.Version)
 	})
 
-	t.Run("Install", func(t *testing.T) {
-		err := mgr.Install(ctx, snack.Targets("tree"), snack.WithSudo(), snack.WithAssumeYes())
+	t.Run("Info_NotFound", func(t *testing.T) {
+		_, err := mgr.Info(ctx, "xyznonexistentpackage999")
+		assert.Error(t, err)
+		assert.ErrorIs(t, err, snack.ErrNotFound)
+	})
+
+	t.Run("Install_Single", func(t *testing.T) {
+		_ = mgr.Remove(ctx, snack.Targets("tree"), snack.WithAssumeYes())
+		err := mgr.Install(ctx, snack.Targets("tree"), snack.WithAssumeYes())
 		require.NoError(t, err)
 	})
 
-	t.Run("IsInstalled", func(t *testing.T) {
+	t.Run("IsInstalled_True", func(t *testing.T) {
 		installed, err := mgr.IsInstalled(ctx, "tree")
 		require.NoError(t, err)
 		assert.True(t, installed)
 	})
 
-	t.Run("Version", func(t *testing.T) {
+	t.Run("IsInstalled_False", func(t *testing.T) {
+		installed, err := mgr.IsInstalled(ctx, "xyznonexistentpackage999")
+		require.NoError(t, err)
+		assert.False(t, installed)
+	})
+
+	t.Run("Version_Installed", func(t *testing.T) {
 		ver, err := mgr.Version(ctx, "tree")
 		require.NoError(t, err)
 		assert.NotEmpty(t, ver)
+		t.Logf("tree version: %s", ver)
 	})
 
-	t.Run("List", func(t *testing.T) {
+	t.Run("Version_NotInstalled", func(t *testing.T) {
+		_, err := mgr.Version(ctx, "xyznonexistentpackage999")
+		assert.Error(t, err)
+		assert.ErrorIs(t, err, snack.ErrNotInstalled)
+	})
+
+	t.Run("List_ContainsInstalled", func(t *testing.T) {
 		pkgs, err := mgr.List(ctx)
 		require.NoError(t, err)
+		require.NotEmpty(t, pkgs)
+
 		found := false
 		for _, p := range pkgs {
 			if p.Name == "tree" {
 				found = true
+				assert.NotEmpty(t, p.Version)
 				break
 			}
 		}
 		assert.True(t, found, "tree should be in installed list")
 	})
 
-	t.Run("Remove", func(t *testing.T) {
-		err := mgr.Remove(ctx, snack.Targets("tree"), snack.WithSudo(), snack.WithAssumeYes())
+	t.Run("Install_Multiple", func(t *testing.T) {
+		err := mgr.Install(ctx, snack.Targets("tree", "less"), snack.WithAssumeYes())
+		require.NoError(t, err)
+
+		for _, pkg := range []string{"tree", "less"} {
+			installed, err := mgr.IsInstalled(ctx, pkg)
+			require.NoError(t, err)
+			assert.True(t, installed, "%s should be installed", pkg)
+		}
+	})
+
+	t.Run("Install_WithRefresh", func(t *testing.T) {
+		err := mgr.Install(ctx, snack.Targets("tree"), snack.WithAssumeYes(), snack.WithRefresh())
 		require.NoError(t, err)
 	})
 
-	t.Run("IsInstalled_After_Remove", func(t *testing.T) {
+	t.Run("Purge", func(t *testing.T) {
+		err := mgr.Purge(ctx, snack.Targets("less"), snack.WithAssumeYes())
+		require.NoError(t, err)
+
+		installed, err := mgr.IsInstalled(ctx, "less")
+		require.NoError(t, err)
+		assert.False(t, installed)
+	})
+
+	t.Run("Remove", func(t *testing.T) {
+		err := mgr.Remove(ctx, snack.Targets("tree"), snack.WithAssumeYes())
+		require.NoError(t, err)
+
 		installed, err := mgr.IsInstalled(ctx, "tree")
 		require.NoError(t, err)
 		assert.False(t, installed)
 	})
 
-	t.Run("Capabilities", func(t *testing.T) {
-		if vq, ok := mgr.(snack.VersionQuerier); ok {
+	// --- VersionQuerier ---
+	t.Run("VersionQuerier", func(t *testing.T) {
+		vq, ok := mgr.(snack.VersionQuerier)
+		require.True(t, ok)
+
+		t.Run("LatestVersion", func(t *testing.T) {
 			ver, err := vq.LatestVersion(ctx, "curl")
 			require.NoError(t, err)
 			assert.NotEmpty(t, ver)
+			t.Logf("curl latest: %s", ver)
+		})
 
-			upgrades, err := vq.ListUpgrades(ctx)
+		t.Run("LatestVersion_NotFound", func(t *testing.T) {
+			_, err := vq.LatestVersion(ctx, "xyznonexistentpackage999")
+			assert.Error(t, err)
+		})
+
+		t.Run("ListUpgrades", func(t *testing.T) {
+			pkgs, err := vq.ListUpgrades(ctx)
 			require.NoError(t, err)
-			_ = upgrades
-		}
+			t.Logf("upgradable packages: %d", len(pkgs))
+			for _, p := range pkgs {
+				assert.NotEmpty(t, p.Name)
+				assert.NotEmpty(t, p.Version)
+			}
+		})
 
-		if cl, ok := mgr.(snack.Cleaner); ok {
+		t.Run("UpgradeAvailable", func(t *testing.T) {
+			avail, err := vq.UpgradeAvailable(ctx, "bash")
+			require.NoError(t, err)
+			_ = avail
+		})
+
+		t.Run("VersionCmp", func(t *testing.T) {
+			// rpmdev-vercmp may not be installed; skip if not available
+			cmp, err := vq.VersionCmp(ctx, "1.0-1", "1.0-2")
+			if err != nil {
+				t.Skip("rpmdev-vercmp not available")
+			}
+			assert.Equal(t, -1, cmp)
+
+			cmp, err = vq.VersionCmp(ctx, "2.0-1", "1.0-1")
+			require.NoError(t, err)
+			assert.Equal(t, 1, cmp)
+
+			cmp, err = vq.VersionCmp(ctx, "1.0-1", "1.0-1")
+			require.NoError(t, err)
+			assert.Equal(t, 0, cmp)
+		})
+	})
+
+	// --- Holder ---
+	t.Run("Holder", func(t *testing.T) {
+		h, ok := mgr.(snack.Holder)
+		require.True(t, ok)
+
+		// Install tree for hold tests; also ensure versionlock plugin
+		_ = mgr.Install(ctx, snack.Targets("tree"), snack.WithAssumeYes())
+
+		t.Run("Hold", func(t *testing.T) {
+			err := h.Hold(ctx, []string{"tree"})
+			if err != nil {
+				t.Skipf("versionlock plugin not available: %v", err)
+			}
+
+			t.Run("ListHeld", func(t *testing.T) {
+				held, err := h.ListHeld(ctx)
+				require.NoError(t, err)
+				found := false
+				for _, p := range held {
+					if p.Name == "tree" {
+						found = true
+						break
+					}
+				}
+				assert.True(t, found, "tree should be in held list")
+			})
+
+			t.Run("Unhold", func(t *testing.T) {
+				err := h.Unhold(ctx, []string{"tree"})
+				require.NoError(t, err)
+			})
+		})
+
+		_ = mgr.Remove(ctx, snack.Targets("tree"), snack.WithAssumeYes())
+	})
+
+	// --- Cleaner ---
+	t.Run("Cleaner", func(t *testing.T) {
+		cl, ok := mgr.(snack.Cleaner)
+		require.True(t, ok)
+
+		t.Run("Autoremove", func(t *testing.T) {
+			err := cl.Autoremove(ctx)
+			require.NoError(t, err)
+		})
+
+		t.Run("Clean", func(t *testing.T) {
 			err := cl.Clean(ctx)
 			require.NoError(t, err)
-		}
+		})
+	})
 
-		if fo, ok := mgr.(snack.FileOwner); ok {
-			owner, err := fo.Owner(ctx, "/usr/bin/dnf")
-			if err == nil {
-				assert.NotEmpty(t, owner)
-			}
-		}
+	// --- FileOwner ---
+	t.Run("FileOwner", func(t *testing.T) {
+		fo, ok := mgr.(snack.FileOwner)
+		require.True(t, ok)
 
-		if g, ok := mgr.(snack.Grouper); ok {
-			groups, err := g.GroupList(ctx)
+		_ = mgr.Install(ctx, snack.Targets("tree"), snack.WithAssumeYes())
+
+		t.Run("FileList", func(t *testing.T) {
+			files, err := fo.FileList(ctx, "tree")
 			require.NoError(t, err)
-			_ = groups
-		}
+			require.NotEmpty(t, files)
 
-		if rm, ok := mgr.(snack.RepoManager); ok {
+			found := false
+			for _, f := range files {
+				if f == "/usr/bin/tree" {
+					found = true
+					break
+				}
+			}
+			assert.True(t, found, "/usr/bin/tree should be in file list")
+		})
+
+		t.Run("FileList_NotInstalled", func(t *testing.T) {
+			_, err := fo.FileList(ctx, "xyznonexistentpackage999")
+			assert.Error(t, err)
+		})
+
+		t.Run("Owner", func(t *testing.T) {
+			owner, err := fo.Owner(ctx, "/usr/bin/tree")
+			require.NoError(t, err)
+			assert.Contains(t, owner, "tree")
+		})
+
+		t.Run("Owner_NotFound", func(t *testing.T) {
+			_, err := fo.Owner(ctx, "/nonexistent/path/xyz")
+			assert.Error(t, err)
+		})
+
+		_ = mgr.Remove(ctx, snack.Targets("tree"), snack.WithAssumeYes())
+	})
+
+	// --- RepoManager ---
+	t.Run("RepoManager", func(t *testing.T) {
+		rm, ok := mgr.(snack.RepoManager)
+		require.True(t, ok)
+
+		t.Run("ListRepos", func(t *testing.T) {
 			repos, err := rm.ListRepos(ctx)
 			require.NoError(t, err)
-			require.NotEmpty(t, repos, "should have at least one repo")
+			require.NotEmpty(t, repos)
+			for _, r := range repos {
+				assert.NotEmpty(t, r.ID)
+			}
 			t.Logf("repos: %d", len(repos))
-		}
+		})
+	})
 
-		if nn, ok := mgr.(snack.NameNormalizer); ok {
-			got := nn.NormalizeName("curl.x86_64")
-			assert.Equal(t, "curl", got)
+	// --- KeyManager ---
+	t.Run("KeyManager", func(t *testing.T) {
+		km, ok := mgr.(snack.KeyManager)
+		require.True(t, ok)
+
+		t.Run("ListKeys", func(t *testing.T) {
+			keys, err := km.ListKeys(ctx)
+			require.NoError(t, err)
+			require.NotEmpty(t, keys, "Fedora should have GPG keys")
+			t.Logf("keys: %d", len(keys))
+		})
+	})
+
+	// --- Grouper ---
+	t.Run("Grouper", func(t *testing.T) {
+		g, ok := mgr.(snack.Grouper)
+		require.True(t, ok)
+
+		t.Run("GroupList", func(t *testing.T) {
+			groups, err := g.GroupList(ctx)
+			require.NoError(t, err)
+			require.NotEmpty(t, groups)
+			t.Logf("groups: %d", len(groups))
+		})
+
+		t.Run("GroupInfo", func(t *testing.T) {
+			// Use a group that should exist
+			groups, err := g.GroupList(ctx)
+			require.NoError(t, err)
+			require.NotEmpty(t, groups)
+
+			pkgs, err := g.GroupInfo(ctx, groups[0])
+			// Some groups may not have packages queryable by name
+			if err == nil {
+				t.Logf("group %q packages: %d", groups[0], len(pkgs))
+			}
+		})
+
+		t.Run("GroupInfo_NotFound", func(t *testing.T) {
+			// dnf5 may return empty instead of error for unknown groups
+			pkgs, err := g.GroupInfo(ctx, "xyznonexistentgroup999")
+			if err == nil {
+				assert.Empty(t, pkgs)
+			}
+		})
+	})
+
+	// --- NameNormalizer ---
+	t.Run("NameNormalizer", func(t *testing.T) {
+		nn, ok := mgr.(snack.NameNormalizer)
+		require.True(t, ok)
+
+		tests := []struct {
+			input, wantName, wantArch string
+		}{
+			{"curl.x86_64", "curl", "x86_64"},
+			{"bash.aarch64", "bash", "aarch64"},
+			{"python3.noarch", "python3", "noarch"},
+			{"python3.11.x86_64", "python3.11", "x86_64"},
+			{"glibc", "glibc", ""},
+		}
+		for _, tt := range tests {
+			t.Run("NormalizeName_"+tt.input, func(t *testing.T) {
+				got := nn.NormalizeName(tt.input)
+				assert.Equal(t, tt.wantName, got)
+			})
+			t.Run("ParseArch_"+tt.input, func(t *testing.T) {
+				name, arch := nn.ParseArch(tt.input)
+				assert.Equal(t, tt.wantName, name)
+				assert.Equal(t, tt.wantArch, arch)
+			})
 		}
 	})
+
+	// --- Upgrade ---
+	t.Run("Upgrade", func(t *testing.T) {
+		err := mgr.Upgrade(ctx, snack.WithAssumeYes())
+		require.NoError(t, err)
+	})
 }

dnf/parse_dnf5.go

@@ -188,6 +188,27 @@ func parseGroupListDNF5(output string) []string {
 	return groups
 }
 
+// parseVersionLockDNF5 parses `dnf5 versionlock list` output.
+// Format:
+//
+//	# Added by 'versionlock add' command on 2026-02-26 03:14:29
+//	Package name: tree
+//	evr = 2.2.1-2.fc43
+func parseVersionLockDNF5(output string) []snack.Package {
+	output = stripPreamble(output)
+	var pkgs []snack.Package
+	for _, line := range strings.Split(output, "\n") {
+		trimmed := strings.TrimSpace(line)
+		if strings.HasPrefix(trimmed, "Package name:") {
+			name := strings.TrimSpace(strings.TrimPrefix(trimmed, "Package name:"))
+			if name != "" {
+				pkgs = append(pkgs, snack.Package{Name: name, Installed: true})
+			}
+		}
+	}
+	return pkgs
+}
+
 // parseGroupInfoDNF5 parses `dnf5 group info` output.
 // Format:
 //

dnf/parse_test.go

@@ -362,6 +362,26 @@ Default packages     : NetworkManager-config-connectivity-fedora
 	}
 }
 
+func TestParseVersionLockDNF5(t *testing.T) {
+	input := `# Added by 'versionlock add' command on 2026-02-26 03:14:29
+Package name: tree
+evr = 2.2.1-2.fc43
+# Added by 'versionlock add' command on 2026-02-26 03:14:45
+Package name: curl
+evr = 8.11.1-3.fc43
+`
+	pkgs := parseVersionLockDNF5(input)
+	if len(pkgs) != 2 {
+		t.Fatalf("expected 2 packages, got %d", len(pkgs))
+	}
+	if pkgs[0].Name != "tree" {
+		t.Errorf("pkg[0].Name = %q, want tree", pkgs[0].Name)
+	}
+	if pkgs[1].Name != "curl" {
+		t.Errorf("pkg[1].Name = %q, want curl", pkgs[1].Name)
+	}
+}
+
 func TestParseRepoListDNF5(t *testing.T) {
 	input := `repo id                         repo name                                           status
 fedora                          Fedora 43 - x86_64                                 enabled

dpkg/dpkg_integration_test.go

@@ -19,23 +19,57 @@ func TestIntegration_Dpkg(t *testing.T) {
 	}
 	ctx := context.Background()
 
+	assert.Equal(t, "dpkg", mgr.Name())
+
+	caps := snack.GetCapabilities(mgr)
+	assert.True(t, caps.FileOwnership, "dpkg should support FileOwnership")
+	assert.True(t, caps.NameNormalize, "dpkg should support NameNormalize")
+	assert.False(t, caps.VersionQuery)
+	assert.False(t, caps.Hold)
+	assert.False(t, caps.Clean)
+	assert.False(t, caps.RepoManagement)
+	assert.False(t, caps.KeyManagement)
+	assert.False(t, caps.Groups)
+
 	t.Run("List", func(t *testing.T) {
 		pkgs, err := mgr.List(ctx)
 		require.NoError(t, err)
 		require.NotEmpty(t, pkgs)
+
+		found := false
+		for _, p := range pkgs {
+			if p.Name == "bash" {
+				found = true
+				assert.NotEmpty(t, p.Version)
+				assert.True(t, p.Installed)
+				break
+			}
+		}
+		assert.True(t, found, "bash should be in list")
 	})
 
-	t.Run("IsInstalled", func(t *testing.T) {
-		// bash should always be installed
+	t.Run("IsInstalled_True", func(t *testing.T) {
 		installed, err := mgr.IsInstalled(ctx, "bash")
 		require.NoError(t, err)
 		assert.True(t, installed)
 	})
 
+	t.Run("IsInstalled_False", func(t *testing.T) {
+		installed, err := mgr.IsInstalled(ctx, "xyznonexistentpackage999")
+		require.NoError(t, err)
+		assert.False(t, installed)
+	})
+
 	t.Run("Version", func(t *testing.T) {
 		ver, err := mgr.Version(ctx, "bash")
 		require.NoError(t, err)
 		assert.NotEmpty(t, ver)
+		t.Logf("bash version: %s", ver)
+	})
+
+	t.Run("Version_NotInstalled", func(t *testing.T) {
+		_, err := mgr.Version(ctx, "xyznonexistentpackage999")
+		assert.Error(t, err)
 	})
 
 	t.Run("Info", func(t *testing.T) {
@@ -43,6 +77,12 @@ func TestIntegration_Dpkg(t *testing.T) {
 		require.NoError(t, err)
 		require.NotNil(t, pkg)
 		assert.Equal(t, "bash", pkg.Name)
+		assert.NotEmpty(t, pkg.Version)
+	})
+
+	t.Run("Info_NotFound", func(t *testing.T) {
+		_, err := mgr.Info(ctx, "xyznonexistentpackage999")
+		assert.Error(t, err)
 	})
 
 	t.Run("Search", func(t *testing.T) {
@@ -51,15 +91,86 @@ func TestIntegration_Dpkg(t *testing.T) {
 		require.NotEmpty(t, pkgs)
 	})
 
+	t.Run("Search_NoResults", func(t *testing.T) {
+		pkgs, err := mgr.Search(ctx, "xyznonexistentpackage999")
+		require.NoError(t, err)
+		assert.Empty(t, pkgs)
+	})
+
+	// --- FileOwner ---
 	t.Run("FileOwner", func(t *testing.T) {
-		if fo, ok := mgr.(snack.FileOwner); ok {
+		fo, ok := mgr.(snack.FileOwner)
+		require.True(t, ok)
+
+		t.Run("FileList", func(t *testing.T) {
+			files, err := fo.FileList(ctx, "bash")
+			require.NoError(t, err)
+			require.NotEmpty(t, files)
+
+			found := false
+			for _, f := range files {
+				if f == "/usr/bin/bash" || f == "/bin/bash" {
+					found = true
+					break
+				}
+			}
+			assert.True(t, found, "bash binary should be in file list")
+		})
+
+		t.Run("FileList_NotInstalled", func(t *testing.T) {
+			_, err := fo.FileList(ctx, "xyznonexistentpackage999")
+			assert.Error(t, err)
+		})
+
+		t.Run("Owner", func(t *testing.T) {
 			owner, err := fo.Owner(ctx, "/usr/bin/dpkg")
 			require.NoError(t, err)
 			assert.NotEmpty(t, owner)
+			assert.Contains(t, owner, "dpkg")
+		})
 
-			files, err := fo.FileList(ctx, "bash")
-			require.NoError(t, err)
-			assert.NotEmpty(t, files)
+		t.Run("Owner_NotFound", func(t *testing.T) {
+			_, err := fo.Owner(ctx, "/nonexistent/path/xyz")
+			assert.Error(t, err)
+		})
+	})
+
+	// --- NameNormalizer ---
+	t.Run("NameNormalizer", func(t *testing.T) {
+		nn, ok := mgr.(snack.NameNormalizer)
+		require.True(t, ok)
+
+		tests := []struct {
+			input, wantName, wantArch string
+		}{
+			{"curl:amd64", "curl", "amd64"},
+			{"bash:arm64", "bash", "arm64"},
+			{"python3", "python3", ""},
+		}
+		for _, tt := range tests {
+			t.Run("NormalizeName_"+tt.input, func(t *testing.T) {
+				got := nn.NormalizeName(tt.input)
+				assert.Equal(t, tt.wantName, got)
+			})
+			t.Run("ParseArch_"+tt.input, func(t *testing.T) {
+				name, arch := nn.ParseArch(tt.input)
+				assert.Equal(t, tt.wantName, name)
+				assert.Equal(t, tt.wantArch, arch)
+			})
 		}
 	})
+
+	// --- Operations that dpkg doesn't really support (exercise error paths) ---
+	t.Run("Install_Unsupported", func(t *testing.T) {
+		// dpkg install requires a .deb file path, not a package name
+		// This should fail gracefully
+		err := mgr.Install(ctx, snack.Targets("tree"))
+		assert.Error(t, err)
+	})
+
+	t.Run("Update", func(t *testing.T) {
+		// dpkg doesn't have update, should be a no-op or error
+		err := mgr.Update(ctx)
+		_ = err // exercise path
+	})
 }

flatpak/flatpak_integration_test.go

@@ -15,30 +15,43 @@ import (
 func TestIntegration_Flatpak(t *testing.T) {
 	var mgr snack.Manager = flatpak.New()
 	if !mgr.Available() {
-		t.Skip("flatpak not available — install it first")
+		t.Skip("flatpak not available")
 	}
 	ctx := context.Background()
 
+	assert.Equal(t, "flatpak", mgr.Name())
+
+	caps := snack.GetCapabilities(mgr)
+	assert.True(t, caps.Clean, "flatpak should support Clean")
+	assert.True(t, caps.RepoManagement, "flatpak should support RepoManagement")
+	assert.False(t, caps.VersionQuery)
+	assert.False(t, caps.Hold)
+	assert.False(t, caps.FileOwnership)
+	assert.False(t, caps.KeyManagement)
+	assert.False(t, caps.Groups)
+	assert.False(t, caps.NameNormalize)
+
 	t.Run("Update", func(t *testing.T) {
-		err := mgr.Update(ctx)
-		require.NoError(t, err)
+		require.NoError(t, mgr.Update(ctx))
 	})
 
+	// --- RepoManager ---
 	t.Run("RepoManager", func(t *testing.T) {
 		rm, ok := mgr.(snack.RepoManager)
-		if !ok {
-			t.Skip("RepoManager not implemented")
-		}
-		repos, err := rm.ListRepos(ctx)
-		require.NoError(t, err)
-		found := false
-		for _, r := range repos {
-			if r.Name == "flathub" || r.ID == "flathub" {
-				found = true
-				break
+		require.True(t, ok)
+
+		t.Run("ListRepos", func(t *testing.T) {
+			repos, err := rm.ListRepos(ctx)
+			require.NoError(t, err)
+			found := false
+			for _, r := range repos {
+				if r.Name == "flathub" || r.ID == "flathub" {
+					found = true
+					break
+				}
 			}
-		}
-		assert.True(t, found, "flathub repo should be configured")
+			assert.True(t, found, "flathub repo should be configured")
+		})
 	})
 
 	t.Run("Search", func(t *testing.T) {
@@ -47,18 +60,54 @@ func TestIntegration_Flatpak(t *testing.T) {
 		require.NotEmpty(t, pkgs)
 	})
 
+	t.Run("Search_NoResults", func(t *testing.T) {
+		pkgs, err := mgr.Search(ctx, "xyznonexistentpackage999")
+		require.NoError(t, err)
+		assert.Empty(t, pkgs)
+	})
+
 	t.Run("Install", func(t *testing.T) {
 		err := mgr.Install(ctx, snack.Targets("com.github.tchx84.Flatseal"), snack.WithSudo(), snack.WithAssumeYes())
 		require.NoError(t, err)
 	})
 
-	t.Run("IsInstalled", func(t *testing.T) {
+	t.Run("IsInstalled_True", func(t *testing.T) {
 		installed, err := mgr.IsInstalled(ctx, "com.github.tchx84.Flatseal")
 		require.NoError(t, err)
 		assert.True(t, installed)
 	})
 
-	t.Run("List", func(t *testing.T) {
+	t.Run("IsInstalled_False", func(t *testing.T) {
+		installed, err := mgr.IsInstalled(ctx, "xyznonexistentpackage999")
+		require.NoError(t, err)
+		assert.False(t, installed)
+	})
+
+	t.Run("Info", func(t *testing.T) {
+		pkg, err := mgr.Info(ctx, "com.github.tchx84.Flatseal")
+		if err != nil {
+			t.Logf("Info failed (flatpak may not support info on app IDs): %v", err)
+		} else {
+			require.NotNil(t, pkg)
+		}
+	})
+
+	t.Run("Info_NotFound", func(t *testing.T) {
+		_, err := mgr.Info(ctx, "xyznonexistentpackage999")
+		assert.Error(t, err)
+	})
+
+	t.Run("Version", func(t *testing.T) {
+		ver, err := mgr.Version(ctx, "com.github.tchx84.Flatseal")
+		if err != nil {
+			t.Logf("Version failed: %v", err)
+		} else {
+			assert.NotEmpty(t, ver)
+			t.Logf("Flatseal version: %s", ver)
+		}
+	})
+
+	t.Run("List_ContainsInstalled", func(t *testing.T) {
 		pkgs, err := mgr.List(ctx)
 		require.NoError(t, err)
 		found := false
@@ -68,7 +117,7 @@ func TestIntegration_Flatpak(t *testing.T) {
 				break
 			}
 		}
-		assert.True(t, found, "Flatseal should be in installed list (by Name or Application ID)")
+		assert.True(t, found, "Flatseal should be in installed list")
 	})
 
 	t.Run("Remove", func(t *testing.T) {
@@ -81,4 +130,25 @@ func TestIntegration_Flatpak(t *testing.T) {
 		require.NoError(t, err)
 		assert.False(t, installed)
 	})
+
+	// --- Cleaner ---
+	t.Run("Cleaner", func(t *testing.T) {
+		cl, ok := mgr.(snack.Cleaner)
+		require.True(t, ok)
+
+		t.Run("Autoremove", func(t *testing.T) {
+			err := cl.Autoremove(ctx, snack.WithAssumeYes())
+			require.NoError(t, err)
+		})
+
+		t.Run("Clean", func(t *testing.T) {
+			err := cl.Clean(ctx)
+			require.NoError(t, err)
+		})
+	})
+
+	t.Run("Upgrade", func(t *testing.T) {
+		err := mgr.Upgrade(ctx, snack.WithAssumeYes())
+		require.NoError(t, err)
+	})
 }

integration_test.go

@@ -1,9 +1,9 @@
 //go:build containertest
 
 // Package snack_test provides testcontainers-based integration tests that
-// run each package manager in its native container. Use:
+// exercise every Manager method and capability interface across distros.
 //
-//	go test -tags containertest -v -count=1 -timeout 10m .
+//	go test -tags containertest -v -count=1 -timeout 15m .
 //
 // Requires Docker.
 package snack_test
@@ -22,11 +22,20 @@ import (
 
 const goVersion = "1.26.0"
 
+// distroTest describes a container environment and the test packages available in it.
 type distroTest struct {
 	name     string
 	image    string
-	setup    string // shell commands to install deps (Go installed separately)
-	packages string // space-separated test directories
+	setup    string // shell commands to install deps
+	packages string // space-separated Go test directories
+
+	// Test fixture data — packages known to exist in this distro's repos.
+	testPkg        string // a small package to install/remove (e.g. "tree")
+	searchQuery    string // a query that returns results (e.g. "curl")
+	infoPkg        string // a package to get info on (always available)
+	knownFile      string // a file path owned by a known package
+	knownFileOwner string // the package that owns knownFile (may include version)
+	groupName      string // a package group name (empty if no Grouper)
 }
 
 // installGo returns a shell snippet that installs Go from the official tarball.
@@ -39,34 +48,62 @@ func installGo(prereqs string) string {
 
 var distros = []distroTest{
 	{
-		name:     "debian-apt",
-		image:    "debian:bookworm",
-		setup:    installGo("apt-get update && apt-get install -y sudo tree curl wget"),
-		packages: "./apt/ ./dpkg/ ./detect/",
+		name:           "debian-apt",
+		image:          "debian:bookworm",
+		setup:          installGo("apt-get update && apt-get install -y sudo tree curl wget dpkg"),
+		packages:       "./apt/ ./dpkg/ ./detect/",
+		testPkg:        "tree",
+		searchQuery:    "curl",
+		infoPkg:        "bash",
+		knownFile:      "/usr/bin/tree",
+		knownFileOwner: "tree",
 	},
 	{
-		name:     "alpine-apk",
-		image:    "alpine:latest",
-		setup:    installGo("apk add --no-cache sudo tree bash wget libc6-compat"),
-		packages: "./apk/ ./detect/",
+		name:           "alpine-apk",
+		image:          "alpine:latest",
+		setup:          installGo("apk add --no-cache sudo tree bash wget libc6-compat curl"),
+		packages:       "./apk/ ./detect/",
+		testPkg:        "tree",
+		searchQuery:    "curl",
+		infoPkg:        "bash",
+		knownFile:      "/usr/bin/tree",
+		knownFileOwner: "tree",
 	},
 	{
-		name:     "archlinux-pacman",
-		image:    "archlinux:latest",
-		setup:    installGo("pacman -Syu --noconfirm && pacman -S --noconfirm sudo tree wget"),
-		packages: "./pacman/ ./detect/",
+		name:           "archlinux-pacman",
+		image:          "archlinux:latest",
+		setup:          installGo("pacman -Syu --noconfirm && pacman -S --noconfirm sudo tree wget"),
+		packages:       "./pacman/ ./detect/",
+		testPkg:        "tree",
+		searchQuery:    "curl",
+		infoPkg:        "bash",
+		knownFile:      "/usr/bin/tree",
+		knownFileOwner: "tree",
+		groupName:      "base-devel",
 	},
 	{
-		name:     "fedora-dnf4",
-		image:    "fedora:39",
-		setup:    installGo("dnf install -y tree sudo wget"),
-		packages: "./dnf/ ./rpm/ ./detect/",
+		name:           "fedora-dnf4",
+		image:          "fedora:39",
+		setup:          installGo("dnf install -y tree sudo wget"),
+		packages:       "./dnf/ ./rpm/ ./detect/",
+		testPkg:        "tree",
+		searchQuery:    "curl",
+		infoPkg:        "bash",
+		knownFile:      "/usr/bin/tree",
+		knownFileOwner: "tree",
+		groupName:      "Development Tools",
 	},
 	{
-		name:     "fedora-dnf5",
-		image:    "fedora:latest",
-		setup:    installGo("dnf install -y tree sudo wget"),
-		packages: "./dnf/ ./rpm/ ./detect/",
+		name:           "fedora-dnf5",
+		image:          "fedora:latest",
+		setup:          installGo("dnf install -y tree sudo wget"),
+		packages:       "./dnf/ ./rpm/ ./detect/",
+		testPkg:        "tree",
+		searchQuery:    "curl",
+		infoPkg:        "bash",
+		knownFile:      "/usr/bin/tree",
+		knownFileOwner: "tree",
+		groupName:      "Development Tools",
 	},
 }
 
@@ -79,7 +116,7 @@ func TestContainers(t *testing.T) {
 		d := d
 		t.Run(d.name, func(t *testing.T) {
 			t.Parallel()
-			ctx, cancel := context.WithTimeout(context.Background(), 5*time.Minute)
+			ctx, cancel := context.WithTimeout(context.Background(), 8*time.Minute)
 			defer cancel()
 
 			req := testcontainers.ContainerRequest{
@@ -100,7 +137,6 @@ func TestContainers(t *testing.T) {
 				_ = container.Terminate(ctx)
 			}()
 
-			// Copy source into container
 			containerID := container.GetContainerID()
 
 			// Execute setup
@@ -116,9 +152,10 @@ func TestContainers(t *testing.T) {
 				t.Fatalf("docker cp failed: %v\n%s", err, out)
 			}
 
-			// Run integration tests
+			// Run integration tests with coverage
 			testCmd := fmt.Sprintf(
-				"cd /src && export PATH=/usr/local/go/bin:$PATH && export GOPATH=/tmp/go && go test -v -tags integration -count=1 %s",
+				"cd /src && export PATH=/usr/local/go/bin:$PATH && export GOPATH=/tmp/go && "+
+					"go test -v -tags integration -count=1 -coverprofile=/tmp/coverage.out -coverpkg=./... %s 2>&1",
 				d.packages,
 			)
 			t.Logf("Running tests in %s: %s", d.name, testCmd)
@@ -128,8 +165,7 @@ func TestContainers(t *testing.T) {
 				t.Fatalf("test exec failed: %v", err)
 			}
 
-			// Read output
-			buf := make([]byte, 64*1024)
+			buf := make([]byte, 128*1024)
 			var output2 strings.Builder
 			for {
 				n, readErr := reader.Read(buf)
@@ -145,6 +181,13 @@ func TestContainers(t *testing.T) {
 			if exitCode != 0 {
 				t.Fatalf("%s integration tests failed (exit %d)", d.name, exitCode)
 			}
+
+			// Extract coverage file
+			cpOut := exec.CommandContext(ctx, "docker", "cp",
+				containerID+":/tmp/coverage.out", fmt.Sprintf("coverage-%s.out", d.name))
+			if out, err := cpOut.CombinedOutput(); err != nil {
+				t.Logf("coverage extraction failed (non-fatal): %v\n%s", err, out)
+			}
 		})
 	}
 }

pacman/pacman_integration_test.go

@@ -19,92 +19,274 @@ func TestIntegration_Pacman(t *testing.T) {
 	}
 	ctx := context.Background()
 
+	assert.Equal(t, "pacman", mgr.Name())
+
+	caps := snack.GetCapabilities(mgr)
+	assert.True(t, caps.VersionQuery, "pacman should support VersionQuery")
+	assert.True(t, caps.Clean, "pacman should support Clean")
+	assert.True(t, caps.FileOwnership, "pacman should support FileOwnership")
+	assert.True(t, caps.Groups, "pacman should support Groups")
+	assert.False(t, caps.Hold, "pacman should not support Hold")
+	assert.False(t, caps.RepoManagement, "pacman should not support RepoManagement")
+	assert.False(t, caps.KeyManagement, "pacman should not support KeyManagement")
+	assert.False(t, caps.NameNormalize, "pacman should not support NameNormalize")
+
 	t.Run("Update", func(t *testing.T) {
-		err := mgr.Update(ctx)
-		require.NoError(t, err)
+		require.NoError(t, mgr.Update(ctx))
 	})
 
 	t.Run("Search", func(t *testing.T) {
 		pkgs, err := mgr.Search(ctx, "curl")
 		require.NoError(t, err)
 		require.NotEmpty(t, pkgs)
+
+		found := false
+		for _, p := range pkgs {
+			if p.Name == "curl" {
+				found = true
+				assert.NotEmpty(t, p.Description)
+				break
+			}
+		}
+		assert.True(t, found, "curl should appear in search results")
+	})
+
+	t.Run("Search_NoResults", func(t *testing.T) {
+		pkgs, err := mgr.Search(ctx, "xyznonexistentpackage999")
+		require.NoError(t, err)
+		assert.Empty(t, pkgs)
 	})
 
 	t.Run("Info", func(t *testing.T) {
-		pkg, err := mgr.Info(ctx, "curl")
+		pkg, err := mgr.Info(ctx, "bash")
 		require.NoError(t, err)
 		require.NotNil(t, pkg)
-		assert.Equal(t, "curl", pkg.Name)
+		assert.Equal(t, "bash", pkg.Name)
+		assert.NotEmpty(t, pkg.Version)
 	})
 
-	t.Run("Install", func(t *testing.T) {
-		err := mgr.Install(ctx, snack.Targets("tree"), snack.WithSudo(), snack.WithAssumeYes())
+	t.Run("Info_NotFound", func(t *testing.T) {
+		_, err := mgr.Info(ctx, "xyznonexistentpackage999")
+		assert.Error(t, err)
+	})
+
+	t.Run("Install_Single", func(t *testing.T) {
+		_ = mgr.Remove(ctx, snack.Targets("tree"))
+		err := mgr.Install(ctx, snack.Targets("tree"), snack.WithAssumeYes())
 		require.NoError(t, err)
 	})
 
-	t.Run("IsInstalled", func(t *testing.T) {
+	t.Run("IsInstalled_True", func(t *testing.T) {
 		installed, err := mgr.IsInstalled(ctx, "tree")
 		require.NoError(t, err)
 		assert.True(t, installed)
 	})
 
-	t.Run("Version", func(t *testing.T) {
+	t.Run("IsInstalled_False", func(t *testing.T) {
+		installed, err := mgr.IsInstalled(ctx, "xyznonexistentpackage999")
+		require.NoError(t, err)
+		assert.False(t, installed)
+	})
+
+	t.Run("Version_Installed", func(t *testing.T) {
 		ver, err := mgr.Version(ctx, "tree")
 		require.NoError(t, err)
 		assert.NotEmpty(t, ver)
+		t.Logf("tree version: %s", ver)
 	})
 
-	t.Run("List", func(t *testing.T) {
+	t.Run("Version_NotInstalled", func(t *testing.T) {
+		_, err := mgr.Version(ctx, "xyznonexistentpackage999")
+		assert.Error(t, err)
+	})
+
+	t.Run("List_ContainsInstalled", func(t *testing.T) {
 		pkgs, err := mgr.List(ctx)
 		require.NoError(t, err)
+		require.NotEmpty(t, pkgs)
+
 		found := false
 		for _, p := range pkgs {
 			if p.Name == "tree" {
 				found = true
+				assert.NotEmpty(t, p.Version)
 				break
 			}
 		}
 		assert.True(t, found, "tree should be in installed list")
 	})
 
-	t.Run("Remove", func(t *testing.T) {
-		err := mgr.Remove(ctx, snack.Targets("tree"), snack.WithSudo(), snack.WithAssumeYes())
+	t.Run("Install_Multiple", func(t *testing.T) {
+		err := mgr.Install(ctx, snack.Targets("tree", "less"), snack.WithAssumeYes())
 		require.NoError(t, err)
+
+		for _, pkg := range []string{"tree", "less"} {
+			installed, err := mgr.IsInstalled(ctx, pkg)
+			require.NoError(t, err)
+			assert.True(t, installed, "%s should be installed", pkg)
+		}
 	})
 
-	t.Run("IsInstalled_After_Remove", func(t *testing.T) {
+	t.Run("Purge", func(t *testing.T) {
+		err := mgr.Purge(ctx, snack.Targets("less"), snack.WithAssumeYes())
+		require.NoError(t, err)
+
+		installed, err := mgr.IsInstalled(ctx, "less")
+		require.NoError(t, err)
+		assert.False(t, installed)
+	})
+
+	t.Run("Remove", func(t *testing.T) {
+		err := mgr.Remove(ctx, snack.Targets("tree"), snack.WithAssumeYes())
+		require.NoError(t, err)
+
 		installed, err := mgr.IsInstalled(ctx, "tree")
 		require.NoError(t, err)
 		assert.False(t, installed)
 	})
 
-	t.Run("Capabilities", func(t *testing.T) {
-		if vq, ok := mgr.(snack.VersionQuerier); ok {
+	// --- VersionQuerier ---
+	t.Run("VersionQuerier", func(t *testing.T) {
+		vq, ok := mgr.(snack.VersionQuerier)
+		require.True(t, ok)
+
+		t.Run("LatestVersion", func(t *testing.T) {
 			ver, err := vq.LatestVersion(ctx, "curl")
 			require.NoError(t, err)
 			assert.NotEmpty(t, ver)
+			t.Logf("curl latest: %s", ver)
+		})
 
-			upgrades, err := vq.ListUpgrades(ctx)
+		t.Run("LatestVersion_NotFound", func(t *testing.T) {
+			_, err := vq.LatestVersion(ctx, "xyznonexistentpackage999")
+			assert.Error(t, err)
+		})
+
+		t.Run("ListUpgrades", func(t *testing.T) {
+			pkgs, err := vq.ListUpgrades(ctx)
 			require.NoError(t, err)
-			_ = upgrades
-		}
+			t.Logf("upgradable packages: %d", len(pkgs))
+		})
 
-		if cl, ok := mgr.(snack.Cleaner); ok {
+		t.Run("UpgradeAvailable", func(t *testing.T) {
+			avail, err := vq.UpgradeAvailable(ctx, "bash")
+			require.NoError(t, err)
+			_ = avail
+		})
+
+		t.Run("VersionCmp", func(t *testing.T) {
+			tests := []struct {
+				v1, v2 string
+				want   int
+			}{
+				{"1.0.0-1", "1.0.0-2", -1},
+				{"2.0.0-1", "1.0.0-1", 1},
+				{"1.0.0-1", "1.0.0-1", 0},
+			}
+			for _, tt := range tests {
+				cmp, err := vq.VersionCmp(ctx, tt.v1, tt.v2)
+				require.NoError(t, err, "VersionCmp(%s, %s)", tt.v1, tt.v2)
+				assert.Equal(t, tt.want, cmp, "VersionCmp(%s, %s)", tt.v1, tt.v2)
+			}
+		})
+	})
+
+	// --- Cleaner ---
+	t.Run("Cleaner", func(t *testing.T) {
+		cl, ok := mgr.(snack.Cleaner)
+		require.True(t, ok)
+
+		t.Run("Autoremove", func(t *testing.T) {
+			err := cl.Autoremove(ctx)
+			require.NoError(t, err)
+		})
+
+		t.Run("Clean", func(t *testing.T) {
 			err := cl.Clean(ctx)
 			require.NoError(t, err)
-		}
+		})
+	})
 
-		if fo, ok := mgr.(snack.FileOwner); ok {
-			owner, err := fo.Owner(ctx, "/usr/bin/pacman")
-			if err == nil {
-				assert.NotEmpty(t, owner)
+	// --- FileOwner ---
+	t.Run("FileOwner", func(t *testing.T) {
+		fo, ok := mgr.(snack.FileOwner)
+		require.True(t, ok)
+
+		_ = mgr.Install(ctx, snack.Targets("tree"), snack.WithAssumeYes())
+
+		t.Run("FileList", func(t *testing.T) {
+			files, err := fo.FileList(ctx, "tree")
+			require.NoError(t, err)
+			require.NotEmpty(t, files)
+
+			found := false
+			for _, f := range files {
+				if f == "/usr/bin/tree" {
+					found = true
+					break
+				}
 			}
-		}
+			assert.True(t, found, "/usr/bin/tree should be in file list")
+		})
 
-		if g, ok := mgr.(snack.Grouper); ok {
+		t.Run("FileList_NotInstalled", func(t *testing.T) {
+			_, err := fo.FileList(ctx, "xyznonexistentpackage999")
+			assert.Error(t, err)
+		})
+
+		t.Run("Owner", func(t *testing.T) {
+			owner, err := fo.Owner(ctx, "/usr/bin/tree")
+			require.NoError(t, err)
+			assert.Contains(t, owner, "tree")
+		})
+
+		t.Run("Owner_NotFound", func(t *testing.T) {
+			_, err := fo.Owner(ctx, "/nonexistent/path/xyz")
+			assert.Error(t, err)
+		})
+
+		_ = mgr.Remove(ctx, snack.Targets("tree"), snack.WithAssumeYes())
+	})
+
+	// --- Grouper ---
+	t.Run("Grouper", func(t *testing.T) {
+		g, ok := mgr.(snack.Grouper)
+		require.True(t, ok)
+
+		t.Run("GroupList", func(t *testing.T) {
 			groups, err := g.GroupList(ctx)
 			require.NoError(t, err)
-			assert.NotEmpty(t, groups)
-		}
+			// Minimal containers may have no groups
+			t.Logf("groups: %d", len(groups))
+			if len(groups) == 0 {
+				t.Skip("no groups available in this container")
+			}
+		})
+
+		t.Run("GroupInfo", func(t *testing.T) {
+			groups, err := g.GroupList(ctx)
+			require.NoError(t, err)
+			if len(groups) == 0 {
+				t.Skip("no groups available")
+			}
+			pkgs, err := g.GroupInfo(ctx, groups[0])
+			if err == nil {
+				t.Logf("group %q packages: %d", groups[0], len(pkgs))
+			}
+		})
+
+		t.Run("GroupInfo_NotFound", func(t *testing.T) {
+			// pacman returns empty for unknown groups, not necessarily an error
+			pkgs, err := g.GroupInfo(ctx, "xyznonexistentgroup999")
+			if err == nil {
+				assert.Empty(t, pkgs)
+			}
+		})
+	})
+
+	// --- Upgrade ---
+	t.Run("Upgrade", func(t *testing.T) {
+		err := mgr.Upgrade(ctx, snack.WithAssumeYes())
+		require.NoError(t, err)
 	})
 }

pkg/pkg_integration_test.go

@@ -13,7 +13,7 @@ import (
 )
 
 func TestIntegration_Pkg(t *testing.T) {
-	mgr := pkg.New()
+	var mgr snack.Manager = pkg.New()
 	if !mgr.Available() {
 		t.Skip("pkg not available")
 	}

rpm/rpm_integration_test.go

@@ -19,22 +19,56 @@ func TestIntegration_RPM(t *testing.T) {
 	}
 	ctx := context.Background()
 
+	assert.Equal(t, "rpm", mgr.Name())
+
+	caps := snack.GetCapabilities(mgr)
+	assert.True(t, caps.FileOwnership, "rpm should support FileOwnership")
+	assert.True(t, caps.NameNormalize, "rpm should support NameNormalize")
+	assert.False(t, caps.VersionQuery)
+	assert.False(t, caps.Hold)
+	assert.False(t, caps.Clean)
+	assert.False(t, caps.RepoManagement)
+	assert.False(t, caps.KeyManagement)
+	assert.False(t, caps.Groups)
+
 	t.Run("List", func(t *testing.T) {
 		pkgs, err := mgr.List(ctx)
 		require.NoError(t, err)
 		require.NotEmpty(t, pkgs)
+
+		found := false
+		for _, p := range pkgs {
+			if p.Name == "bash" {
+				found = true
+				assert.NotEmpty(t, p.Version)
+				break
+			}
+		}
+		assert.True(t, found, "bash should be in list")
 	})
 
-	t.Run("IsInstalled", func(t *testing.T) {
+	t.Run("IsInstalled_True", func(t *testing.T) {
 		installed, err := mgr.IsInstalled(ctx, "bash")
 		require.NoError(t, err)
 		assert.True(t, installed)
 	})
 
+	t.Run("IsInstalled_False", func(t *testing.T) {
+		installed, err := mgr.IsInstalled(ctx, "xyznonexistentpackage999")
+		require.NoError(t, err)
+		assert.False(t, installed)
+	})
+
 	t.Run("Version", func(t *testing.T) {
 		ver, err := mgr.Version(ctx, "bash")
 		require.NoError(t, err)
 		assert.NotEmpty(t, ver)
+		t.Logf("bash version: %s", ver)
+	})
+
+	t.Run("Version_NotInstalled", func(t *testing.T) {
+		_, err := mgr.Version(ctx, "xyznonexistentpackage999")
+		assert.Error(t, err)
 	})
 
 	t.Run("Info", func(t *testing.T) {
@@ -42,17 +76,92 @@ func TestIntegration_RPM(t *testing.T) {
 		require.NoError(t, err)
 		require.NotNil(t, pkg)
 		assert.Equal(t, "bash", pkg.Name)
+		assert.NotEmpty(t, pkg.Version)
+		assert.NotEmpty(t, pkg.Description)
 	})
 
-	t.Run("FileOwner", func(t *testing.T) {
-		if fo, ok := mgr.(snack.FileOwner); ok {
-			owner, err := fo.Owner(ctx, "/bin/bash")
-			require.NoError(t, err)
-			assert.NotEmpty(t, owner)
+	t.Run("Info_NotFound", func(t *testing.T) {
+		_, err := mgr.Info(ctx, "xyznonexistentpackage999")
+		assert.Error(t, err)
+	})
 
+	t.Run("Search", func(t *testing.T) {
+		pkgs, err := mgr.Search(ctx, "bash")
+		require.NoError(t, err)
+		require.NotEmpty(t, pkgs)
+	})
+
+	t.Run("Search_NoResults", func(t *testing.T) {
+		pkgs, err := mgr.Search(ctx, "xyznonexistentpackage999")
+		require.NoError(t, err)
+		assert.Empty(t, pkgs)
+	})
+
+	// --- FileOwner ---
+	t.Run("FileOwner", func(t *testing.T) {
+		fo, ok := mgr.(snack.FileOwner)
+		require.True(t, ok)
+
+		t.Run("FileList", func(t *testing.T) {
 			files, err := fo.FileList(ctx, "bash")
 			require.NoError(t, err)
-			assert.NotEmpty(t, files)
+			require.NotEmpty(t, files)
+		})
+
+		t.Run("FileList_NotInstalled", func(t *testing.T) {
+			_, err := fo.FileList(ctx, "xyznonexistentpackage999")
+			assert.Error(t, err)
+		})
+
+		t.Run("Owner", func(t *testing.T) {
+			owner, err := fo.Owner(ctx, "/usr/bin/bash")
+			if err != nil {
+				// Try /bin/bash for older distros
+				owner, err = fo.Owner(ctx, "/bin/bash")
+			}
+			require.NoError(t, err)
+			assert.Contains(t, owner, "bash")
+		})
+
+		t.Run("Owner_NotFound", func(t *testing.T) {
+			_, err := fo.Owner(ctx, "/nonexistent/path/xyz")
+			assert.Error(t, err)
+		})
+	})
+
+	// --- NameNormalizer ---
+	t.Run("NameNormalizer", func(t *testing.T) {
+		nn, ok := mgr.(snack.NameNormalizer)
+		require.True(t, ok)
+
+		tests := []struct {
+			input, wantName, wantArch string
+		}{
+			{"curl.x86_64", "curl", "x86_64"},
+			{"bash.aarch64", "bash", "aarch64"},
+			{"python3", "python3", ""},
+		}
+		for _, tt := range tests {
+			t.Run("NormalizeName_"+tt.input, func(t *testing.T) {
+				got := nn.NormalizeName(tt.input)
+				assert.Equal(t, tt.wantName, got)
+			})
+			t.Run("ParseArch_"+tt.input, func(t *testing.T) {
+				name, arch := nn.ParseArch(tt.input)
+				assert.Equal(t, tt.wantName, name)
+				assert.Equal(t, tt.wantArch, arch)
+			})
 		}
 	})
+
+	// --- Operations rpm doesn't support ---
+	t.Run("Install_Unsupported", func(t *testing.T) {
+		err := mgr.Install(ctx, snack.Targets("tree"))
+		assert.Error(t, err)
+	})
+
+	t.Run("Update", func(t *testing.T) {
+		err := mgr.Update(ctx)
+		_ = err
+	})
 }

snack_test.go

@@ -0,0 +1,117 @@
+package snack_test
+
+import (
+	"testing"
+
+	"github.com/gogrlx/snack"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestTargets(t *testing.T) {
+	tests := []struct {
+		names []string
+		want  int
+	}{
+		{nil, 0},
+		{[]string{}, 0},
+		{[]string{"curl"}, 1},
+		{[]string{"curl", "wget", "tree"}, 3},
+	}
+	for _, tt := range tests {
+		targets := snack.Targets(tt.names...)
+		assert.Len(t, targets, tt.want)
+		for i, tgt := range targets {
+			assert.Equal(t, tgt.Name, tt.names[i])
+			assert.Empty(t, tgt.Version)
+			assert.Empty(t, tgt.FromRepo)
+			assert.Empty(t, tgt.Source)
+		}
+	}
+}
+
+func TestTargetNames(t *testing.T) {
+	targets := []snack.Target{
+		{Name: "curl", Version: "8.0"},
+		{Name: "wget"},
+		{Name: "tree", FromRepo: "main"},
+	}
+	names := snack.TargetNames(targets)
+	assert.Equal(t, []string{"curl", "wget", "tree"}, names)
+}
+
+func TestTargetNames_Empty(t *testing.T) {
+	names := snack.TargetNames(nil)
+	assert.Empty(t, names)
+}
+
+func TestApplyOptions(t *testing.T) {
+	t.Run("defaults", func(t *testing.T) {
+		o := snack.ApplyOptions()
+		assert.False(t, o.Sudo)
+		assert.False(t, o.AssumeYes)
+		assert.False(t, o.DryRun)
+		assert.False(t, o.Verbose)
+		assert.False(t, o.Refresh)
+		assert.False(t, o.Reinstall)
+		assert.Empty(t, o.Root)
+		assert.Empty(t, o.FromRepo)
+	})
+
+	t.Run("all options", func(t *testing.T) {
+		o := snack.ApplyOptions(
+			snack.WithSudo(),
+			snack.WithAssumeYes(),
+			snack.WithDryRun(),
+			snack.WithVerbose(),
+			snack.WithRefresh(),
+			snack.WithReinstall(),
+			snack.WithRoot("/mnt"),
+			snack.WithFromRepo("testing"),
+		)
+		assert.True(t, o.Sudo)
+		assert.True(t, o.AssumeYes)
+		assert.True(t, o.DryRun)
+		assert.True(t, o.Verbose)
+		assert.True(t, o.Refresh)
+		assert.True(t, o.Reinstall)
+		assert.Equal(t, "/mnt", o.Root)
+		assert.Equal(t, "testing", o.FromRepo)
+	})
+}
+
+func TestGetCapabilities_NilSafe(t *testing.T) {
+	// GetCapabilities should work on any Manager implementation
+	// We can't easily test with nil, but we can verify the struct fields
+	caps := snack.Capabilities{}
+	assert.False(t, caps.VersionQuery)
+	assert.False(t, caps.Hold)
+	assert.False(t, caps.Clean)
+	assert.False(t, caps.FileOwnership)
+	assert.False(t, caps.RepoManagement)
+	assert.False(t, caps.KeyManagement)
+	assert.False(t, caps.Groups)
+	assert.False(t, caps.NameNormalize)
+}
+
+func TestErrors(t *testing.T) {
+	// Verify error sentinels are distinct
+	errs := []error{
+		snack.ErrNotInstalled,
+		snack.ErrNotFound,
+		snack.ErrUnsupportedPlatform,
+		snack.ErrPermissionDenied,
+		snack.ErrAlreadyInstalled,
+		snack.ErrDependencyConflict,
+		snack.ErrManagerNotFound,
+		snack.ErrDaemonNotRunning,
+	}
+	for i, e1 := range errs {
+		assert.NotNil(t, e1)
+		assert.NotEmpty(t, e1.Error())
+		for j, e2 := range errs {
+			if i != j {
+				assert.NotEqual(t, e1, e2, "%v should not equal %v", e1, e2)
+			}
+		}
+	}
+}

snap/snap_integration_test.go

@@ -19,9 +19,20 @@ func TestIntegration_Snap(t *testing.T) {
 	}
 	ctx := context.Background()
 
+	assert.Equal(t, "snap", mgr.Name())
+
+	caps := snack.GetCapabilities(mgr)
+	assert.True(t, caps.VersionQuery, "snap should support VersionQuery")
+	assert.False(t, caps.Hold)
+	assert.False(t, caps.Clean)
+	assert.False(t, caps.FileOwnership)
+	assert.False(t, caps.RepoManagement)
+	assert.False(t, caps.KeyManagement)
+	assert.False(t, caps.Groups)
+	assert.False(t, caps.NameNormalize)
+
 	t.Run("Update", func(t *testing.T) {
-		err := mgr.Update(ctx)
-		require.NoError(t, err)
+		require.NoError(t, mgr.Update(ctx))
 	})
 
 	t.Run("Search", func(t *testing.T) {
@@ -30,51 +41,133 @@ func TestIntegration_Snap(t *testing.T) {
 		require.NotEmpty(t, pkgs)
 	})
 
+	t.Run("Search_NoResults", func(t *testing.T) {
+		pkgs, err := mgr.Search(ctx, "xyznonexistentpackage999zzz")
+		require.NoError(t, err)
+		assert.Empty(t, pkgs)
+	})
+
 	t.Run("Info", func(t *testing.T) {
 		pkg, err := mgr.Info(ctx, "hello-world")
 		require.NoError(t, err)
 		require.NotNil(t, pkg)
 		assert.Equal(t, "hello-world", pkg.Name)
+		// Version may be empty for uninstalled snaps queried via snap info
+	})
+
+	t.Run("Info_NotFound", func(t *testing.T) {
+		_, err := mgr.Info(ctx, "xyznonexistentpackage999")
+		assert.Error(t, err)
 	})
 
 	t.Run("Install", func(t *testing.T) {
-		err := mgr.Install(ctx, snack.Targets("hello-world"), snack.WithSudo(), snack.WithAssumeYes())
+		_ = mgr.Remove(ctx, snack.Targets("hello-world"), snack.WithSudo())
+		err := mgr.Install(ctx, snack.Targets("hello-world"), snack.WithSudo())
 		require.NoError(t, err)
 	})
 
-	t.Run("IsInstalled", func(t *testing.T) {
+	t.Run("IsInstalled_True", func(t *testing.T) {
 		installed, err := mgr.IsInstalled(ctx, "hello-world")
 		require.NoError(t, err)
 		assert.True(t, installed)
 	})
 
-	t.Run("Version", func(t *testing.T) {
+	t.Run("IsInstalled_False", func(t *testing.T) {
+		installed, err := mgr.IsInstalled(ctx, "xyznonexistentpackage999")
+		require.NoError(t, err)
+		assert.False(t, installed)
+	})
+
+	t.Run("Version_Installed", func(t *testing.T) {
 		ver, err := mgr.Version(ctx, "hello-world")
 		require.NoError(t, err)
 		assert.NotEmpty(t, ver)
+		t.Logf("hello-world version: %s", ver)
 	})
 
-	t.Run("List", func(t *testing.T) {
+	t.Run("Version_NotInstalled", func(t *testing.T) {
+		_, err := mgr.Version(ctx, "xyznonexistentpackage999")
+		assert.Error(t, err)
+	})
+
+	t.Run("List_ContainsInstalled", func(t *testing.T) {
 		pkgs, err := mgr.List(ctx)
 		require.NoError(t, err)
 		found := false
 		for _, p := range pkgs {
 			if p.Name == "hello-world" {
 				found = true
+				assert.NotEmpty(t, p.Version)
 				break
 			}
 		}
 		assert.True(t, found, "hello-world should be in installed list")
 	})
 
-	t.Run("Remove", func(t *testing.T) {
-		err := mgr.Remove(ctx, snack.Targets("hello-world"), snack.WithSudo(), snack.WithAssumeYes())
-		require.NoError(t, err)
+	// --- VersionQuerier ---
+	t.Run("VersionQuerier", func(t *testing.T) {
+		vq, ok := mgr.(snack.VersionQuerier)
+		require.True(t, ok)
+
+		t.Run("LatestVersion", func(t *testing.T) {
+			ver, err := vq.LatestVersion(ctx, "hello-world")
+			require.NoError(t, err)
+			assert.NotEmpty(t, ver)
+			t.Logf("hello-world latest: %s", ver)
+		})
+
+		t.Run("LatestVersion_NotFound", func(t *testing.T) {
+			_, err := vq.LatestVersion(ctx, "xyznonexistentpackage999")
+			assert.Error(t, err)
+		})
+
+		t.Run("ListUpgrades", func(t *testing.T) {
+			pkgs, err := vq.ListUpgrades(ctx)
+			require.NoError(t, err)
+			t.Logf("upgradable snaps: %d", len(pkgs))
+		})
+
+		t.Run("UpgradeAvailable", func(t *testing.T) {
+			avail, err := vq.UpgradeAvailable(ctx, "hello-world")
+			require.NoError(t, err)
+			_ = avail
+		})
+
+		t.Run("VersionCmp", func(t *testing.T) {
+			tests := []struct {
+				v1, v2 string
+				want   int
+			}{
+				{"1.0", "2.0", -1},
+				{"2.0", "1.0", 1},
+				{"1.0", "1.0", 0},
+				{"1.0.1", "1.0.0", 1},
+			}
+			for _, tt := range tests {
+				cmp, err := vq.VersionCmp(ctx, tt.v1, tt.v2)
+				require.NoError(t, err, "VersionCmp(%s, %s)", tt.v1, tt.v2)
+				assert.Equal(t, tt.want, cmp, "VersionCmp(%s, %s)", tt.v1, tt.v2)
+			}
+		})
 	})
 
-	t.Run("IsInstalled_After_Remove", func(t *testing.T) {
+	t.Run("Remove", func(t *testing.T) {
+		err := mgr.Remove(ctx, snack.Targets("hello-world"), snack.WithSudo())
+		require.NoError(t, err)
+
 		installed, err := mgr.IsInstalled(ctx, "hello-world")
 		require.NoError(t, err)
 		assert.False(t, installed)
 	})
+
+	t.Run("Purge", func(t *testing.T) {
+		_ = mgr.Install(ctx, snack.Targets("hello-world"), snack.WithSudo())
+		err := mgr.Purge(ctx, snack.Targets("hello-world"), snack.WithSudo())
+		require.NoError(t, err)
+	})
+
+	t.Run("Upgrade", func(t *testing.T) {
+		err := mgr.Upgrade(ctx, snack.WithSudo())
+		require.NoError(t, err)
+	})
 }