1package colorful
2
3import (
4	"fmt"
5	"testing"
6)
7
8// This is really difficult to test, if you've got a good idea, pull request!
9
10// Check if it returns all valid and enough colors.
11func TestColorCount(t *testing.T) {
12	fmt.Printf("Testing up to %v palettes may take a while...\n", 100)
13	for i := 0; i < 100; i++ {
14		//pal, err := SoftPaletteEx(i, SoftPaletteGenSettings{nil, 50, true})
15		pal, err := SoftPalette(i)
16		if err != nil {
17			t.Errorf("Error: %v", err)
18		}
19
20		// Check the color count of the palette
21		if len(pal) != i {
22			t.Errorf("Requested %v colors but got %v", i, len(pal))
23		}
24
25		// Also check whether all colors exist in RGB space.
26		for icol, col := range pal {
27			if !col.IsValid() {
28				t.Errorf("Color %v in palette of %v is invalid: %v", icol, len(pal), col)
29			}
30		}
31	}
32	fmt.Println("Done with that, but more tests to run.")
33}
34
35// Check if it errors-out on an impossible constraint
36func TestImpossibleConstraint(t *testing.T) {
37	never := func(l, a, b float64) bool { return false }
38
39	pal, err := SoftPaletteEx(10, SoftPaletteSettings{never, 50, true})
40	if err == nil || pal != nil {
41		t.Error("Should error-out on impossible constraint!")
42	}
43}
44
45// Check whether the constraint is respected
46func TestConstraint(t *testing.T) {
47	octant := func(l, a, b float64) bool { return l <= 0.5 && a <= 0.0 && b <= 0.0 }
48
49	pal, err := SoftPaletteEx(100, SoftPaletteSettings{octant, 50, true})
50	if err != nil {
51		t.Errorf("Error: %v", err)
52	}
53
54	// Check ALL the colors!
55	for icol, col := range pal {
56		if !col.IsValid() {
57			t.Errorf("Color %v in constrained palette is invalid: %v", icol, col)
58		}
59
60		l, a, b := col.Lab()
61		if l > 0.5 || a > 0.0 || b > 0.0 {
62			t.Errorf("Color %v in constrained palette violates the constraint: %v (lab: %v)", icol, col, [3]float64{l, a, b})
63		}
64	}
65}
66