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colorcrop_test.go
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colorcrop_test.go
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package colorcrop
import (
"image"
"image/color"
"image/png"
"os"
"reflect"
"runtime"
"strings"
"testing"
)
// epsilon is a maximum permissible error
const epsilon = 0.00000001
func TestCropRectanle(t *testing.T) {
type test struct {
filename string
expected image.Rectangle
got image.Rectangle
}
comparators := []comparator{CmpRGBComponents, CmpEuclidean, CmpCIE76}
thresold := 0.5
tests := []test{
{filename: "01.png", expected: image.Rectangle{image.Point{0, 0}, image.Point{1, 1}}},
{filename: "02.png", expected: image.Rectangle{image.Point{1, 0}, image.Point{2, 1}}},
{filename: "03.png", expected: image.Rectangle{image.Point{2, 0}, image.Point{3, 1}}},
{filename: "04.png", expected: image.Rectangle{image.Point{3, 0}, image.Point{4, 1}}},
{filename: "05.png", expected: image.Rectangle{image.Point{0, 1}, image.Point{1, 2}}},
{filename: "06.png", expected: image.Rectangle{image.Point{1, 1}, image.Point{2, 2}}},
{filename: "07.png", expected: image.Rectangle{image.Point{2, 1}, image.Point{3, 2}}},
{filename: "08.png", expected: image.Rectangle{image.Point{3, 1}, image.Point{4, 2}}},
{filename: "09.png", expected: image.Rectangle{image.Point{0, 2}, image.Point{1, 3}}},
{filename: "10.png", expected: image.Rectangle{image.Point{1, 2}, image.Point{2, 3}}},
{filename: "11.png", expected: image.Rectangle{image.Point{2, 2}, image.Point{3, 3}}},
{filename: "12.png", expected: image.Rectangle{image.Point{3, 2}, image.Point{4, 3}}},
{filename: "13.png", expected: image.Rectangle{image.Point{0, 3}, image.Point{1, 4}}},
{filename: "14.png", expected: image.Rectangle{image.Point{1, 3}, image.Point{2, 4}}},
{filename: "15.png", expected: image.Rectangle{image.Point{2, 3}, image.Point{3, 4}}},
{filename: "16.png", expected: image.Rectangle{image.Point{3, 3}, image.Point{4, 4}}},
}
for _, comparator := range comparators {
for _, test := range tests {
file, err := os.Open("testimages/" + test.filename)
if err != nil {
t.Fatal(err)
}
defer file.Close()
image, err := png.Decode(file)
if err != nil {
t.Fatal(err)
}
test.got = cropRectanle(image, color.RGBA{255, 255, 255, 255}, thresold, comparator)
if !reflect.DeepEqual(test.expected, test.got) {
t.Errorf("expected %v, got %v for comparator: %s, file: %s",
test.expected, test.got, getFuncName(comparator), test.filename)
}
}
}
}
func TestCropWithComparator(t *testing.T) {
type test struct {
filename string
expectedWidth, expectedHeight int
gotWidth, gotHeight int
}
comparators := []comparator{CmpRGBComponents, CmpEuclidean, CmpCIE76}
thresold := 0.5
color := color.RGBA{255, 255, 255, 255}
tests := []test{
{filename: "01.png", expectedWidth: 1, expectedHeight: 1},
{filename: "02.png", expectedWidth: 1, expectedHeight: 1},
{filename: "03.png", expectedWidth: 1, expectedHeight: 1},
{filename: "04.png", expectedWidth: 1, expectedHeight: 1},
{filename: "05.png", expectedWidth: 1, expectedHeight: 1},
{filename: "06.png", expectedWidth: 1, expectedHeight: 1},
{filename: "07.png", expectedWidth: 1, expectedHeight: 1},
{filename: "08.png", expectedWidth: 1, expectedHeight: 1},
{filename: "09.png", expectedWidth: 1, expectedHeight: 1},
{filename: "10.png", expectedWidth: 1, expectedHeight: 1},
{filename: "11.png", expectedWidth: 1, expectedHeight: 1},
{filename: "12.png", expectedWidth: 1, expectedHeight: 1},
{filename: "13.png", expectedWidth: 1, expectedHeight: 1},
{filename: "14.png", expectedWidth: 1, expectedHeight: 1},
{filename: "15.png", expectedWidth: 1, expectedHeight: 1},
{filename: "16.png", expectedWidth: 1, expectedHeight: 1},
}
for _, comparator := range comparators {
for _, test := range tests {
file, err := os.Open("testimages/" + test.filename)
if err != nil {
t.Fatal(err)
}
defer file.Close()
image, err := png.Decode(file)
if err != nil {
t.Fatal(err)
}
newImage := CropWithComparator(image, color, thresold, comparator)
test.gotWidth, test.gotHeight = getImageSize(newImage)
if test.gotWidth != test.expectedWidth || test.gotHeight != test.expectedWidth {
t.Errorf("expected {%d %d}, got {%d %d} for comparator: %s, file: %s",
test.expectedWidth, test.expectedWidth, test.gotWidth, test.gotHeight, getFuncName(comparator), test.filename)
}
}
}
}
func TestCrop(t *testing.T) {
type test struct {
filename string
expectedWidth, expectedHeight int
gotWidth, gotHeight int
}
thresold := 0.5
color := color.RGBA{255, 255, 255, 255}
tests := []test{
{filename: "01.png", expectedWidth: 1, expectedHeight: 1},
{filename: "02.png", expectedWidth: 1, expectedHeight: 1},
{filename: "03.png", expectedWidth: 1, expectedHeight: 1},
{filename: "04.png", expectedWidth: 1, expectedHeight: 1},
{filename: "05.png", expectedWidth: 1, expectedHeight: 1},
{filename: "06.png", expectedWidth: 1, expectedHeight: 1},
{filename: "07.png", expectedWidth: 1, expectedHeight: 1},
{filename: "08.png", expectedWidth: 1, expectedHeight: 1},
{filename: "09.png", expectedWidth: 1, expectedHeight: 1},
{filename: "10.png", expectedWidth: 1, expectedHeight: 1},
{filename: "11.png", expectedWidth: 1, expectedHeight: 1},
{filename: "12.png", expectedWidth: 1, expectedHeight: 1},
{filename: "13.png", expectedWidth: 1, expectedHeight: 1},
{filename: "14.png", expectedWidth: 1, expectedHeight: 1},
{filename: "15.png", expectedWidth: 1, expectedHeight: 1},
{filename: "16.png", expectedWidth: 1, expectedHeight: 1},
}
for _, test := range tests {
file, err := os.Open("testimages/" + test.filename)
if err != nil {
t.Fatal(err)
}
defer file.Close()
image, err := png.Decode(file)
if err != nil {
t.Fatal(err)
}
newImage := Crop(image, color, thresold)
test.gotWidth, test.gotHeight = getImageSize(newImage)
if test.gotWidth != test.expectedWidth || test.gotHeight != test.expectedWidth {
t.Errorf("expected {%d %d}, got {%d %d} for file: %s",
test.expectedWidth, test.expectedWidth, test.gotWidth, test.gotHeight, test.filename)
}
}
}
func getFuncName(i interface{}) string {
s := runtime.FuncForPC(reflect.ValueOf(i).Pointer()).Name()
p := strings.LastIndex(s, ".")
if p > 0 {
return string([]rune(s)[p+1:])
}
return s
}
func getImageSize(image image.Image) (width, height int) {
return image.Bounds().Dx(), image.Bounds().Dy()
}