43 lines
1.1 KiB
Go
43 lines
1.1 KiB
Go
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package chroma
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import (
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"testing"
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"github.com/alecthomas/assert"
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)
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func TestColourRGB(t *testing.T) {
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colour := ParseColour("#8913af")
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assert.Equal(t, uint8(0x89), colour.Red())
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assert.Equal(t, uint8(0x13), colour.Green())
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assert.Equal(t, uint8(0xaf), colour.Blue())
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}
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func TestColourString(t *testing.T) {
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assert.Equal(t, "#8913af", ParseColour("#8913af").String())
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}
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func distance(a, b uint8) uint8 {
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if a < b {
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return b - a
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}
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return a - b
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}
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func TestColourBrighten(t *testing.T) {
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actual := NewColour(128, 128, 128).Brighten(0.5)
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// Closeish to what we expect is fine.
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assert.True(t, distance(192, actual.Red()) <= 2)
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assert.True(t, distance(192, actual.Blue()) <= 2)
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assert.True(t, distance(192, actual.Green()) <= 2)
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actual = NewColour(128, 128, 128).Brighten(-0.5)
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assert.True(t, distance(65, actual.Red()) <= 2)
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assert.True(t, distance(65, actual.Blue()) <= 2)
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assert.True(t, distance(65, actual.Green()) <= 2)
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}
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func TestColourBrightess(t *testing.T) {
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actual := NewColour(128, 128, 128).Brightness()
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assert.True(t, distance(128, uint8(actual*255.0)) <= 2)
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}
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