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package ui
import (
"strconv"
"testing"
)
func TestContrastColorUsesHighContrastForeground(t *testing.T) {
for bg := 0; bg < 256; bg++ {
fg := contrastColor(strconv.Itoa(bg))
if fg != "0" && fg != "15" {
t.Fatalf("contrastColor(%d) = %q, want black or white foreground", bg, fg)
}
r, g, b := xtermRGB(bg)
var ratio float64
if fg == "0" {
ratio = contrastRatio(r, g, b, 0, 0, 0)
} else {
ratio = contrastRatio(r, g, b, 255, 255, 255)
}
if ratio < 4.5 {
t.Fatalf("contrastColor(%d) = %q with contrast ratio %.2f, want >= 4.5", bg, fg, ratio)
}
}
}
func TestContrastColorFallsBackForInvalidInput(t *testing.T) {
tests := []string{"not-a-color", "-1", "256"}
for _, input := range tests {
if got := contrastColor(input); got != "15" {
t.Fatalf("contrastColor(%q) = %q, want 15", input, got)
}
}
}
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