Tests that non-opaque pixels are faithfully preserved in conversions between ImageData and ImageBitmap
On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
PASS newImageData.data[0] is within 5 of imageData.data[0]
PASS newImageData.data[1] is within 5 of imageData.data[1]
PASS newImageData.data[2] is within 5 of imageData.data[2]
PASS newImageData.data[3] is imageData.data[3]
PASS successfullyParsed is true
TEST COMPLETE