Testing the MuteButton class.

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


PASS muteButton.element.localName is "button"
PASS muteButton.element.classList.contains("mute") is true
PASS muteButton.iconName is Icons.Volume
PASS muteButton.muted is false
PASS mutedButton.muted is true
PASS mutedButton.iconName became Icons.VolumeMuted
PASS muteButton.image.element.style.webkitMaskImage.includes("macOS/VolumeHi.svg") became true
PASS mutedButton.image.element.style.webkitMaskImage.includes("macOS/Mute.svg") became true
PASS successfullyParsed is true

TEST COMPLETE