add colors starter files

colors_test.go

@@ -0,0 +1,88 @@
+package go_colorhash
+
+import (
+	"errors"
+	"testing"
+)
+
+func TestCreateColor(t *testing.T) {
+	tc := []struct {
+		ID     string
+		Value  int
+		Result int
+	}{{ID: "white", Value: TotalHexColorspace - 1, Result: TotalHexColorspace - 1},
+		{ID: "WraparoundBlack", Value: TotalHexColorspace, Result: 0},
+		{ID: "black", Value: 0, Result: 0},
+	}
+	for _, c := range tc {
+		t.Run(c.ID, func(t *testing.T) {
+			color := CreateColor(c.Value)
+			if color.Value != c.Result {
+				t.Errorf("Expected Value %d, but got %d", c.Result, color.Value)
+			}
+		})
+
+	}
+}
+func TestToHex(t *testing.T) {
+	tc := []struct {
+		ID     string
+		R      int
+		G      int
+		B      int
+		Result string
+	}{{ID: "red", R: 0xFF, G: 0x00, B: 0x00, Result: "#FF0000"},
+		{ID: "black", R: 0, G: 0, B: 0, Result: "#000000"},
+	}
+	for _, c := range tc {
+		t.Run(c.ID, func(t *testing.T) {
+			color := RGB(c.R, c.G, c.B)
+			if color.ToHex() != c.Result {
+				t.Errorf("Expected Value %s, but got %s", c.Result, color.ToHex())
+			}
+		})
+
+	}
+}
+func TestRGB(t *testing.T) {
+	tc := []struct {
+		ID     string
+		R      int
+		G      int
+		B      int
+		Result int
+	}{{ID: "white", R: 255, G: 255, B: 255, Result: TotalHexColorspace - 1},
+		{ID: "black", R: 0, G: 0, B: 0, Result: 0},
+	}
+	for _, c := range tc {
+		t.Run(c.ID, func(t *testing.T) {
+			color := RGB(c.R, c.G, c.B)
+			if color.Value != c.Result {
+				t.Errorf("Expected Value %d, but got %d", c.Result, color.Value)
+			}
+		})
+
+	}
+}
+func TestFromHex(t *testing.T) {
+	tc := []struct {
+		ID     string
+		Input  string
+		Result string
+		Error  error
+	}{{ID: "red", Input: "#F00", Result: "#FF0000", Error: nil},
+		{ID: "red", Input: "#F00000", Result: "#F00000", Error: nil},
+	}
+	for _, c := range tc {
+		t.Run(c.ID, func(t *testing.T) {
+			color, err := FromHex(c.Input)
+			if !errors.Is(err, c.Error) {
+				t.Error(err)
+			}
+			if color.ToHex() != c.Result {
+				t.Errorf("Expected Value %s, but got %s", c.Result, color.ToHex())
+			}
+		})
+
+	}
+}