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decode_test.go
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decode_test.go
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package imagefile
import (
"bytes"
"image"
"io"
"testing"
)
var decodeTests = []struct {
descr string
input []byte
img []byte
w, h int
}{
{
"empty image",
[]byte("imagefile\000\000\000\000\000\000\000\000"),
[]byte{},
0, 0,
},
{
"image 1x1",
[]byte("imagefile\000\000\000\001\000\000\000\001rgba"),
[]byte("rgba"),
1, 1,
},
}
func TestDecodeImage(t *testing.T) {
for _, test := range decodeTests {
r := bytes.NewBuffer(test.input)
img, err := Decode(r)
if err != nil {
t.Errorf("%s: err not nil: %v", test.descr, err)
continue
}
nrgba, ok := img.(*image.NRGBA)
if !ok {
t.Errorf("%s: wrong image type")
continue
}
if dx, dy := img.Bounds().Dx(), img.Bounds().Dy(); dx != test.w || dy != test.h {
t.Errorf("%s: wrong image size: %d x %d | expected: %d x %d",
test.descr, dx, dy, test.w, test.h)
}
if 0 != bytes.Compare(test.img, nrgba.Pix) {
t.Errorf("%s: image data differs", test.descr)
}
}
}
func TestDecodeImageBadHeader(t *testing.T) {
r := bytes.NewBuffer([]byte("imagefile\000\000\000\000\000\000\000"))
img, err := Decode(r)
if err != io.ErrUnexpectedEOF {
t.Errorf("err: %#v | expected: %#v", err, io.ErrUnexpectedEOF)
}
if img != nil {
t.Errorf("img is not nil")
}
}
func TestDecodeImageBad(t *testing.T) {
r := bytes.NewBuffer([]byte("imagefile\000\000\000\001\000\000\000\001rgb"))
_, err := Decode(r)
if err != io.ErrUnexpectedEOF {
t.Errorf("err: %#v | expected: %#v", err, io.ErrUnexpectedEOF)
}
}