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servo/tests/wpt/web-platform-tests/ambient-light/AmbientLightSensor_onstatechange.html

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<!DOCTYPE html>
<meta charset="utf-8">
<title>AmbientLightSensor Test: onstatechange</title>
<link rel="author" title="Intel" href="http://www.intel.com">
<link rel="help" href="https://www.w3.org/TR/ambient-light/">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
var sensor;
setup(function() {
sensor = new AmbientLightSensor();
});
test(function() {
assert_equals(sensor.state, "idle");
}, "The default sensor.state is 'idle'.");
async_test(function(t) {
sensor.onstatechange = t.step_func_done(function(event) {
assert_equals(sensor.state, "activating");
});
sensor.onerror = t.step_func_done(function(event) {
assert_unreached(event.error.name + ":" + event.error.message);
});
sensor.start();
}, "The sensor.state changes to 'activating' after sensor.start().");
async_test(function(t) {
sensor.onstatechange = t.step_func_done(function(event) {
assert_equals(sensor.state, "idle");
});
sensor.onerror = t.step_func_done(function(event) {
assert_unreached(event.error.name + ":" + event.error.message);
});
sensor.stop();
}, "The sensor.state changes to 'idle' after sensor.stop().");
</script>