mogrify-go/image_test.go at master · joonhoj/mogrify-go · GitHub

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package mogrify

import (
	"bytes"
	"os"
	"testing"
)

func assertDimension(t *testing.T, img Image, expected string) {
	if actual := Dimensions(img); actual != expected {
		t.Errorf("Got wrong dimensions expected:%s got %s", expected, actual)
	}
}

func asset(mime, asset string) Image {
	file, _ := os.Open("./testdata/" + asset)
	defer file.Close()

	image, err := Decode(mime, file)
	if err != nil {
		panic("Image didnt load: " + err.Error())
	}

	return image
}

func TestOpenExisting(t *testing.T) {
	image := asset("image/jpg", "image.jpg")
	defer image.Destroy()

	assertDimension(t, image, "600x399")
}

func TestHeightWidth(t *testing.T) {
	img := asset("image/jpg", "image.jpg")
	defer img.Destroy()

	if img.Bounds().Width != 600 {
		t.Fatalf("%d", img.Bounds().Width)
	}

	if img.Bounds().Height != 399 {
		t.Fatalf("%d", img.Bounds().Height)
	}
}

func TestResizeSuccess(t *testing.T) {
	img := asset("image/jpg", "image.jpg")
	defer img.Destroy()

	resized, err := img.NewResized(Bounds{50, 50})
	if err != nil {
		t.Error(err)
	}
	defer resized.Destroy()

	assertDimension(t, resized, "50x50")
}

func TestCropSuccess(t *testing.T) {
	img := asset("image/jpg", "image.jpg")
	defer img.Destroy()

	cropped, err := img.NewCropped(0, 0, Bounds{50, 50})
	if err != nil {
		t.Error(err)
	}
	defer cropped.Destroy()

	assertDimension(t, cropped, "50x50")
}

func TestGifResizeSuccess(t *testing.T) {
	img := asset("image/gif", "image.gif")
	defer img.Destroy()

	resized, err := img.NewResized(Bounds{50, 50})
	if err != nil {
		t.Error(err)
	}
	defer resized.Destroy()

	assertDimension(t, resized, "50x50")
}

func TestResampleSuccess(t *testing.T) {
	img := asset("image/jpg", "image.jpg")
	defer img.Destroy()

	resized, err := img.NewResampled(Bounds{50, 50})
	if err != nil {
		t.Error(err)
	}
	defer resized.Destroy()

	assertDimension(t, resized, "50x50")
}

func TestCrateFailure(t *testing.T) {
	image := NewImage(-1, -1)
	if image != nil {
		t.Fatalf("This should have failed...")
	}
}

func TestResampleFailure(t *testing.T) {
	img := asset("image/jpg", "image.jpg")
	defer img.Destroy()

	_, err := img.NewResampled(Bounds{-1, 50})
	if err == nil {
		t.Fatalf("This should have failed...")
	}
}

func TestCropFailure(t *testing.T) {
	img := asset("image/jpg", "image.jpg")
	defer img.Destroy()

	_, err := img.NewCropped(0, 0, Bounds{-1, 50})
	if err == nil {
		t.Fatalf("This should have failed...")
	}
}

func TestDecodeEncode(t *testing.T) {
	img := asset("image/jpg", "image.jpg")
	defer img.Destroy()

	resized, err := img.NewResampled(Bounds{100, 100})

	if err != nil {
		t.Error(err)
		return
	}

	assertDimension(t, resized, "100x100")

	buf := bytes.NewBuffer(nil)
	_, err = EncodeJpeg(buf, resized)

	if err != nil {
		t.Error(err)
		return
	}

	roundtrip, err := DecodeJpeg(buf)
	if err != nil {
		panic("Couldn't load image: " + err.Error())
	}

	assertDimension(t, roundtrip, "100x100")
}

func TestDecodePng(t *testing.T) {
	img := asset("image/jpg", "image.jpg")
	defer img.Destroy()

	dest := bytes.NewBuffer(nil)
	_, err := EncodePng(dest, img)

	if err != nil {
		t.Error(err)
		return
	}
}

func TestDecodeGif(t *testing.T) {
	img := asset("image/jpg", "image.jpg")
	defer img.Destroy()

	dest := bytes.NewBuffer(nil)
	_, err := EncodeGif(dest, img)

	if err != nil {
		t.Error(err)
		return
	}
}