What does the tester code do with the static methods()?

What does the tester code with Pixelator instance (member) methods?

getImageHeight()

getImageWidth()

constructCompletes()

constructorWorks()

beginFadeWorks()


stopFadeWorks()

getImageWorks()

canIncreaseFadeWorks()

unitFadeIncreaseWorks()

percentageFadeIncreaseWorks()