| Testing the TracksButton class. |
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| On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". |
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| PASS tracksButton.element.localName is "button" |
| PASS tracksButton.element.classList.contains("tracks") is true |
| PASS tracksButton.iconName is Icons.Tracks |
| PASS tracksButton.image.element.style.webkitMaskImage.includes("macOS/MediaSelector.svg") became true |
| PASS fullscreenTracksButton.image.element.style.webkitMaskImage.includes("macOS/MediaSelector-fullscreen.svg") became true |
| PASS successfullyParsed is true |
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| TEST COMPLETE |
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