add two test cases and relavent pictures for solving issue #211

[Cheese-Bar]

PR Details

Description

By setting the parameters PixelToleranceLevel in the test to achieve aim comparation.

Related Issue

#211

The bug is the following code can not distinguish difference in color and text between the two pictures.

BufferedImage expectedImage = ImageComparisonUtil.readImageFromResources("expected#211.png");
BufferedImage actualImage = ImageComparisonUtil.readImageFromResources("actual#211.png");
ImageComparison comparison = new ImageComparison(expectedImage, actualImage);
ImageComparisonResult result = comparison.compareImages();
assertTrue(ImageComparisonState.MATCH != result.getImageComparisonState());

Motivation and Context

This is because the distinction between the two graphs is too small. So we need to add setPixelToleranceLevel(0.0) when we use it. I also added a separate test to separate the two colors, it shows PixelToleranceLevel = 0.079 can distingrush #c20272 and #df0272. But only PixelToleranceLevel = 0.0 can recognize the difference in numbers.

How Has This Been Tested

Tested in UT level

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

Mention here, shouldProperlyHandleBug180FromRoot() in ImageComparisonUtilUnitTest seems has a incorrect file location for historical reasons. Maybe need to change String imagePath = "build/resources/test/result.png"; to String imagePath = "build/test-images/result.png"; in line 163; But I'm not here to deal with it, just in case.

[romankh3]

thanks for your contribution!