header, garbage
<link rel="help" href="https://w3c.github.io/webvtt/#collect-a-webvtt-block">

assert_equals(cues.length, 1);

assert_equals(cues[0].text, 'text');
assert_equals(cues[0].startTime, 0);
assert_equals(cues[0].endTime, 1);

===
WEBVTT
foobar

00:00:00.000 --> 00:00:01.000
text