Test loop field set to false, and the startTime is equal to stopTime. The result shoud be stopTime will be ignored, but because loop is false, the sound will play only once. Clicking on either "Start" or "Stop" button automatically sets both to the same value of "now", and the chime sound should play one 5 second cycle, then stop. If the "Stop" button (setting stopTime = now) is pressed any time during play, the sound should stop instantly.

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