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content / test / data / back_forward_cache / sensor.html [blame]
<html>Pages with sensor script</html>
<script>
let sensor;
// Handles one event, pushing it to |values| and calling
// |pendingResolve| if set.
function handleEvent(event) {
if (sensor.illuminance) {
// For Ambient Sensor.
values.push(sensor.illuminance);
} else {
values.push(sensor.x);
}
if (pendingResolve !== null) {
pendingResolve('event');
pendingResolve = null;
}
}
// Collects values that have happened so far.
var values = [];
// If set, will be called by handleEvent.
var pendingResolve = null;
// Returns a promise that will resolve when the events array has at least
// |eventCountMin| elements. Returns the number of elements.
function waitForEventsPromise(eventCountMin) {
if (values.length >= eventCountMin) {
return Promise.resolve(values.length);
}
return new Promise(resolve => {
pendingResolve = resolve;
}).then(() => waitForEventsPromise(eventCountMin));
}
// Ensure that that |expected| matches all the values.
function validateEvents(expected) {
if (expected === null) {
return "fail expected === null";
}
let count = 0;
for (value of values) {
count++;
if (Math.abs(value - expected) > 0.01) {
return `fail - ${count}/${values.length}: ` +
`${expected} != ${value}`;
}
}
return 'pass';
}
</script>