Add unit reload support

reload_linux_test.go

@@ -0,0 +1,67 @@
+//go:build linux
+
+package systemctl
+
+import (
+	"context"
+	"os"
+	"path/filepath"
+	"reflect"
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestReloadBuildsExpectedCommand(t *testing.T) {
+	tests := []struct {
+		name string
+		opts Options
+		want []string
+	}{
+		{
+			name: "system mode",
+			opts: Options{},
+			want: []string{"reload", "--system", "nginx.service"},
+		},
+		{
+			name: "user mode",
+			opts: Options{UserMode: true},
+			want: []string{"reload", "--user", "nginx.service"},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			tempDir := t.TempDir()
+			logFile := filepath.Join(tempDir, "args.log")
+			fakeSystemctl := filepath.Join(tempDir, "systemctl")
+			script := "#!/bin/sh\nprintf '%s\\n' \"$@\" > '" + logFile + "'\n"
+
+			if err := os.WriteFile(fakeSystemctl, []byte(script), 0o755); err != nil {
+				t.Fatalf("write fake systemctl: %v", err)
+			}
+
+			original := systemctl
+			systemctl = fakeSystemctl
+			t.Cleanup(func() {
+				systemctl = original
+			})
+
+			ctx, cancel := context.WithTimeout(context.Background(), time.Second)
+			defer cancel()
+
+			if err := Reload(ctx, "nginx.service", tt.opts); err != nil {
+				t.Fatalf("Reload returned error: %v", err)
+			}
+
+			gotBytes, err := os.ReadFile(logFile)
+			if err != nil {
+				t.Fatalf("read captured args: %v", err)
+			}
+			got := strings.Fields(strings.TrimSpace(string(gotBytes)))
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Fatalf("Reload args = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}