Added tests for HexColor.

color_test.go

@@ -0,0 +1,33 @@
+package zntg
+
+import (
+	"image/color"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestHexColor(t *testing.T) {
+	type test struct {
+		Hex      string
+		Success  bool
+		Expected color.RGBA
+	}
+	tests := []test{
+		test{Hex: "#AA3939", Success: true, Expected: color.RGBA{R: 170, G: 57, B: 57, A: 255}},
+		test{Hex: "AA3939", Success: true, Expected: color.RGBA{R: 170, G: 57, B: 57, A: 255}},
+		test{Hex: "#AA3939BB", Success: true, Expected: color.RGBA{R: 170, G: 57, B: 57, A: 187}},
+		test{Hex: "AG3939", Success: false, Expected: color.RGBA{}},
+		test{Hex: "AA3939A", Success: false, Expected: color.RGBA{}},
+		test{Hex: "AA39A", Success: false, Expected: color.RGBA{}},
+	}
+	for _, test := range tests {
+		color, err := HexColor(test.Hex)
+		if test.Success {
+			assert.Nil(t, err)
+			assert.Equal(t, color, test.Expected)
+		} else {
+			assert.NotNil(t, err)
+		}
+	}
+}