Testing the Button class.

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".


PASS button.image.element.style.webkitMaskImage.includes("macOS/Pause.svg") became true
eventSender.mouseMoveTo(0, 0)
eventSender.mouseDown()
Wait 125ms for the transition to shrink the 'picture' element to happen.
eventSender.mouseUp()
Button was pressed.

PASS successfullyParsed is true

TEST COMPLETE