dither/quantizer_test.go

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package main
import (
"image/color"
"testing"
)
func TestNoop(t *testing.T) {
c := noOp(0, 0, color.White)
r, g, b, a := c.RGBA()
if r != 0xffff || g != 0xffff || b != 0xffff || a != 0xffff {
t.Log("noop did not return input")
t.Fail()
}
}
func TestLuminence(t *testing.T) {
l := luminence(color.White)
if l != 1 {
t.Logf("white input did not output 1, instead %f", l)
t.Fail()
}
l = luminence(color.Black)
if l != 0 {
t.Logf("black input did not output 0, instead %f", l)
t.Fail()
}
l = luminence(color.Gray16{0x8000})
if l < 0.5 {
t.Logf("white-leaning gray input was not above 0.5, instead %f", l)
t.Fail()
}
l = luminence(color.Gray16{0x7fff})
if l > 0.5 {
t.Logf("black-leaning gray input not below 0.5, instead %f", l)
t.Fail()
}
}