[QUESTION] how to tell if the comparison has no difference?

[igorgiumellizup]

Hey Roman Beskrovnyi,
how can I tell if after //After configuring the ImageComparison object, can be executed compare() method: val imageComparisonResult: ImageComparisonResult = imageComparison.compareImages() no difference was found? I only want to generate the result file when there is difference. And also for assertions matter, the code needs to know if there is any difference found. I din't find any info about it in the git hub redame.
Thanks!

[Roman Beekeeper]

Hello, @igorgiumellizup.
Thanks for your interest in image-comparison.
I know, that the README may be better :)
For a better understanding of how image-comparison works, you can see the tests for it.
For example one of them:

@DisplayName("Should perform maximal rectangle count")
    @Test
    public void shouldPerformMaximalRectangleCount() {
        //given
        ImageComparison imageComparison = new ImageComparison("expected.png", "actual.png");
        imageComparison.setMaximalRectangleCount(3);
        BufferedImage expectedImage = readImageFromResources("maximalRectangleCountResult.png");

        //when
        ImageComparisonResult imageComparisonResult = imageComparison.compareImages();

        //then
        assertEquals(MISMATCH, imageComparisonResult.getImageComparisonState());
        assertImagesEqual(expectedImage, imageComparisonResult.getResult());
    }

it's a usual test, which checks ImageComparisonResult.

I hope, it will help you.

Best regards,
Roman B.

[igorgiumellizup]

What's the API behind 'assertImagesEqual' ?
It would be more efficient not to create the resulting image when there's no difference

[Roman Beekeeper]

assertImagesEqual just a private method in the test class.

It's not created a new result image in the case when they match. Just take one of them.