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rgb_test.go
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package color_test
import (
"fmt"
"math/rand"
"testing"
"github.com/shelepuginivan/color"
"github.com/stretchr/testify/assert"
)
func TestRGB(t *testing.T) {
assert.Implements(t, (*color.Color)(nil), color.RGB{})
}
func TestNewRGB(t *testing.T) {
cases := []struct {
r uint8
g uint8
b uint8
expected *color.RGB
}{
{r: 0, g: 0, b: 0, expected: &color.RGB{0, 0, 0}},
{r: 1, g: 1, b: 1, expected: &color.RGB{1, 1, 1}},
{r: 100, g: 101, b: 102, expected: &color.RGB{100, 101, 102}},
{r: 255, g: 255, b: 255, expected: &color.RGB{255, 255, 255}},
}
for _, c := range cases {
actual := color.NewRGB(c.r, c.g, c.b)
assert.EqualExportedValues(t, c.expected, actual)
}
// Random tests.
for range 1000 {
r := rand.Intn(256)
g := rand.Intn(256)
b := rand.Intn(256)
expected := &color.RGB{uint8(r), uint8(g), uint8(b)}
actual := color.NewRGB(uint8(r), uint8(g), uint8(b))
assert.EqualExportedValues(t, expected, actual)
}
}
func ExampleNewRGB() {
green := color.NewRGB(0, 255, 0)
fmt.Println(green.Hex()) // Output: #00ff00
}
func TestRGB_Hex(t *testing.T) {
cases := []struct {
color *color.RGB
expected string
}{
{color: &color.RGB{0, 0, 0}, expected: "#000000"},
{color: &color.RGB{0, 0, 1}, expected: "#000001"},
{color: &color.RGB{1, 2, 3}, expected: "#010203"},
{color: &color.RGB{255, 255, 255}, expected: "#ffffff"},
}
for _, c := range cases {
actual := c.color.Hex()
assert.Equal(t, c.expected, actual)
}
// Random tests.
for range 1000 {
r := rand.Intn(256)
g := rand.Intn(256)
b := rand.Intn(256)
expected := fmt.Sprintf("#%02x%02x%02x", r, g, b)
actual := color.RGB{uint8(r), uint8(g), uint8(b)}.Hex()
assert.Equal(t, expected, actual)
}
}
func ExampleRGB_Hex() {
black := color.NewRGB(0, 0, 0)
fmt.Println(black.Hex()) // Output: #000000
}
func TestRGB_CMYK(t *testing.T) {
cases := []struct {
color *color.RGB
expected *color.CMYK
}{
{color: &color.RGB{0, 0, 0}, expected: &color.CMYK{0, 0, 0, 100}},
{color: &color.RGB{255, 255, 255}, expected: &color.CMYK{0, 0, 0, 0}},
{color: &color.RGB{255, 0, 0}, expected: &color.CMYK{0, 100, 100, 0}},
{color: &color.RGB{0, 255, 0}, expected: &color.CMYK{100, 0, 100, 0}},
{color: &color.RGB{0, 0, 255}, expected: &color.CMYK{100, 100, 0, 0}},
{color: &color.RGB{255, 255, 0}, expected: &color.CMYK{0, 0, 100, 0}},
{color: &color.RGB{255, 0, 255}, expected: &color.CMYK{0, 100, 0, 0}},
{color: &color.RGB{0, 255, 255}, expected: &color.CMYK{100, 0, 0, 0}},
}
for _, c := range cases {
actual := c.color.CMYK()
assert.EqualExportedValues(t, c.expected, actual)
}
}
func ExampleRGB_CMYK() {
yellow := color.NewRGB(255, 255, 0)
cmyk := yellow.CMYK()
fmt.Printf("cmyk(%d%%, %d%%, %d%%, %d%%)", cmyk.C, cmyk.M, cmyk.Y, cmyk.K) // Output: cmyk(0%, 0%, 100%, 0%)
}
func TestColor_HSL(t *testing.T) {
cases := []struct {
color *color.RGB
expected *color.HSL
}{
{color: &color.RGB{255, 0, 0}, expected: &color.HSL{0, 100, 50}},
{color: &color.RGB{0, 255, 0}, expected: &color.HSL{120, 100, 50}},
{color: &color.RGB{0, 0, 255}, expected: &color.HSL{240, 100, 50}},
{color: &color.RGB{255, 255, 0}, expected: &color.HSL{60, 100, 50}},
{color: &color.RGB{0, 255, 255}, expected: &color.HSL{180, 100, 50}},
{color: &color.RGB{255, 0, 255}, expected: &color.HSL{300, 100, 50}},
{color: &color.RGB{128, 128, 128}, expected: &color.HSL{0, 0, 50}},
{color: &color.RGB{0, 0, 0}, expected: &color.HSL{0, 0, 0}},
{color: &color.RGB{255, 255, 255}, expected: &color.HSL{0, 0, 100}},
{color: &color.RGB{184, 201, 221}, expected: &color.HSL{212, 35, 79}},
}
for _, c := range cases {
actual := c.color.HSL()
assert.Equal(t, c.expected, actual)
}
// Random tests.
for range 1000 {
r := rand.Intn(256)
g := rand.Intn(256)
b := rand.Intn(256)
color := color.RGB{uint8(r), uint8(g), uint8(b)}
hsl := color.HSL()
assert.True(t, hsl.H >= 0 && hsl.H < 360)
assert.True(t, hsl.S >= 0 && hsl.S <= 100)
assert.True(t, hsl.L >= 0 && hsl.L <= 100)
}
}
func ExampleRGB_HSL() {
c := color.NewRGB(219, 188, 127)
fmt.Println(c.HSL()) // Output: hsl(40, 56%, 68%)
}
func TestRGB_XYZ(t *testing.T) {
cases := []struct {
color *color.RGB
expected *color.XYZ
}{
{&color.RGB{0, 0, 0}, &color.XYZ{0, 0, 0}},
{&color.RGB{255, 0, 0}, &color.XYZ{0.41246, 0.21267, 0.01933}},
{&color.RGB{0, 255, 0}, &color.XYZ{0.35758, 0.71515, 0.11919}},
{&color.RGB{0, 0, 255}, &color.XYZ{0.18044, 0.07217, 0.95030}},
{&color.RGB{255, 255, 0}, &color.XYZ{0.77003, 0.92783, 0.13853}},
{&color.RGB{255, 0, 255}, &color.XYZ{0.59289, 0.28485, 0.96964}},
{&color.RGB{0, 255, 255}, &color.XYZ{0.53801, 0.78733, 1.06950}},
{&color.RGB{255, 255, 255}, &color.XYZ{0.95047, 1.00000, 1.08883}},
{&color.RGB{102, 164, 108}, &color.XYZ{0.21461, 0.30457, 0.18932}},
{&color.RGB{164, 102, 158}, &color.XYZ{0.26232, 0.19865, 0.34794}},
{&color.RGB{164, 120, 102}, &color.XYZ{0.24425, 0.22286, 0.15583}},
{&color.RGB{241, 242, 243}, &color.XYZ{0.84203, 0.88676, 0.97457}},
{&color.RGB{238, 144, 60}, &color.XYZ{0.46053, 0.38455, 0.09271}},
}
for _, c := range cases {
actual := c.color.XYZ()
assert.InDelta(t, c.expected.X, actual.X, 0.001)
assert.InDelta(t, c.expected.Y, actual.Y, 0.001)
assert.InDelta(t, c.expected.Z, actual.Z, 0.001)
}
}
func TestRGB_HSV(t *testing.T) {
cases := []struct {
color *color.RGB
expected *color.HSV
}{
{&color.RGB{255, 0, 0}, &color.HSV{0, 100, 100}},
{&color.RGB{0, 255, 0}, &color.HSV{120, 100, 100}},
{&color.RGB{0, 0, 255}, &color.HSV{240, 100, 100}},
{&color.RGB{255, 255, 0}, &color.HSV{60, 100, 100}},
{&color.RGB{0, 255, 255}, &color.HSV{180, 100, 100}},
{&color.RGB{255, 0, 255}, &color.HSV{300, 100, 100}},
{&color.RGB{128, 128, 128}, &color.HSV{0, 0, 50}},
{&color.RGB{0, 0, 0}, &color.HSV{0, 0, 0}},
{&color.RGB{255, 255, 255}, &color.HSV{0, 0, 100}},
{&color.RGB{0, 0, 128}, &color.HSV{240, 100, 50}},
{&color.RGB{0, 128, 128}, &color.HSV{180, 100, 50}},
{&color.RGB{128, 0, 0}, &color.HSV{0, 100, 50}},
}
for _, c := range cases {
actual := c.color.HSV()
assert.Equal(t, c.expected, actual)
}
// Random tests.
for range 1000 {
r := rand.Intn(256)
g := rand.Intn(256)
b := rand.Intn(256)
color := color.RGB{uint8(r), uint8(g), uint8(b)}
hsv := color.HSV()
assert.True(t, hsv.H >= 0 && hsv.H < 360)
assert.True(t, hsv.S >= 0 && hsv.S <= 100)
assert.True(t, hsv.V >= 0 && hsv.V <= 100)
}
}
func TestRGB_Edit(t *testing.T) {
cases := []struct {
color *color.RGB
expected *color.RGB
editfn func(*color.RGB)
}{
{
color: &color.RGB{200, 200, 200},
expected: &color.RGB{100, 100, 200},
editfn: func(c *color.RGB) {
c.R /= 2
c.G /= 2
},
},
{
color: &color.RGB{255, 0, 0},
expected: &color.RGB{0, 255, 0},
editfn: func(c *color.RGB) {
c.R, c.G = c.G, c.R
},
},
}
for _, c := range cases {
actual := c.color.Edit(c.editfn)
assert.Equal(t, c.expected, actual)
assert.Equal(t, c.expected, c.color)
}
}
func ExampleRGB_Edit() {
silver := color.NewRGB(191, 191, 191)
fmt.Println(silver.Edit(func(c *color.RGB) {
c.R += 10
c.G += 20
c.B += 30
})) // Output: rgb(201, 211, 221)
}