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Example code of lupka/phpunit-compare-images

Informations about the package phpunit-compare-images

PHPUnit Compare Images

PHPUnit assertions for assessing image similarity.

IMPORTANT: You may run into issues comparing different-sized images depending on your setup. I haven't been able to assess for certain what the issue is, but comparing different sized images works fine for me locally on OSX, but my tests fail in Travis CI if I use images with different sizes.

Travis Packagist

Installation

Usage

Add the CompareImagesTrait trait to your test class to enable the use of the assertions.

Assertions

This package includes several assertions.

The first two parameters of each assertion are the images to be compared, which can either be Imagick objects or string file paths.

assertImageSimilarity

Will fail if the two images ARE NOT within the given similarity threshold.

assertImageDifference

Will fail if the two images ARE within the given similarity threshold.

assertImagesSame

Will fail if the two images ARE NOT exactly the same.

assertImagesDifferent

Will fail if the two images ARE exactly the same.

What does $threshold mean?

The $threshold value on the assertImageSimilarity and assertImageDifference functions are compared directly to the result of the compareImages function of PHP's Imagick class. Below our some examples of what threshold you would need to use variety of different comparisons.

Threshold: 0

Images are identical.

Threshold: 0.234

Different images.

Threshold: 0.033

Slightly cropped version of same image.

Threshold: 1

Black vs. white

Notes/Links

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