imagefn - invert_test.go

     1  package imagefn
     2  
     3  import (
     4  	"image"
     5  	"testing"
     6  )
     7  
     8  func TestInvert(t *testing.T) {
     9  	for n, test := range [...]struct {
    10  		In, Out *image.Gray
    11  	}{
    12  		{
    13  			newGray(3, 3, 0, 1, 2, 3, 4, 5, 6, 7, 8),
    14  			newGray(3, 3, 255, 254, 253, 252, 251, 250, 249, 248, 247),
    15  		},
    16  	} {
    17  		if !testImage(Invert(test.In), test.Out) {
    18  			t.Errorf("test %d: images do not match", n+1)
    19  		}
    20  	}
    21  }