// TestImage compares a saved expected image of a given filename with
// an actual image.Image that typically contains the result of a
// rendering. It returns the distance value and the two compared
// images.
func TestImage(filename string, act image.Image, adjust imagetest.Adjuster) (float64, image.Image, image.Image, error) {
request := mandala.LoadResourceRequest{
Filename: filepath.Join(expectedImgPath, filename),
Response: make(chan mandala.LoadResourceResponse),
}
mandala.ResourceManager() <- request
response := <-request.Response
buffer := response.Buffer
if response.Error != nil {
return 1, nil, nil, response.Error
}
exp, err := png.Decode(bytes.NewBuffer(buffer))
if err != nil {
return 1, nil, nil, err
}
return imagetest.CompareDistance(exp, act, adjust), exp, act, nil
}
func (t *TestSuite) TestDraw() {
request := mandala.LoadResourceRequest{
Filename: "drawable/expected.png",
Response: make(chan mandala.LoadResourceResponse),
}
mandala.ResourceManager() <- request
response := <-request.Response
buffer := response.Buffer
t.True(response.Error == nil, "An error occured during resource opening")
if buffer != nil {
exp, err := png.Decode(bytes.NewBuffer(buffer))
t.True(err == nil, "An error occured during png decoding")
distance := imagetest.CompareDistance(exp, <-t.testDraw, nil)
t.True(distance < 0.1, fmt.Sprintf("Distance is %f", distance))
}
}