package main import ( "image/color" "testing" ) func TestParseColor(t *testing.T) { white := color.RGBA{0xff, 0xff, 0xff, 0xff} eq := func(c1, c2 color.Color) bool { r1, g1, b1, a1 := c1.RGBA() r2, g2, b2, a2 := c2.RGBA() return r1 == r2 && g1 == g2 && b1 == b2 && a1 == a2 } type test struct { in string out color.RGBA } var tests = []test{ {"", white}, {"0000ff", blue}, {"0000ffff", blue}, {"00ff00", green}, {"00ff00ff", green}, {"ff0000", red}, {"ff0000ff", red}, {"FF0000", red}, } for _, tt := range tests { c := parseColor(tt.in, white) if eq(c, tt.out) { t.Logf("ok: '%s' == %v", tt.in, c) } else { t.Errorf("parse color failed: '%s' yielded %v, expected %v", tt.in, c, tt.out) } } }