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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /webstorage/event_no_duplicates.html - WPT Dashboard Interop Dashboard
<!DOCTYPE HTML>
<html>
<title>WebStorage Test: StorageEvent - only if something changes</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<script>
const iframe = document.createElement('iframe');
function tests(storageName) {
test(t => assert_true(storageName in window), storageName + ' exists');
const storage = window[storageName];
const iframeStorage = iframe.contentWindow[storageName];
add_completion_callback(() => {
storage.clear();
});
promise_test(t => {
const w = new EventWatcher(t, iframe.contentWindow, 'storage');
// Random key to make sure we don't conflict with any cruft leftover from
// earlier runs. Any synchronization would be really hard with localStorage
// limited guarantees.
const testKey = Math.random().toString(36).slice(2);
storage.setItem(testKey, 'foo');
storage.setItem(testKey, 'foo');
storage.setItem(testKey, 'bar');
return w.wait_for('storage')
.then(e => {
assert_equals(e.storageArea, iframeStorage);
assert_equals(e.key, testKey);
assert_equals(e.newValue, 'foo');
return w.wait_for('storage');
})
.then(e => {
assert_equals(e.storageArea, iframeStorage);
assert_equals(e.key, testKey);
assert_equals(e.oldValue, 'foo');
assert_equals(e.newValue, 'bar');
});
}, 'Setting to same value does not trigger event for ' + storageName);
promise_test(t => {
const w = new EventWatcher(t, iframe.contentWindow, 'storage');
// Random key to make sure we don't conflict with any cruft leftover from
// earlier runs. Any synchronization would be really hard with localStorage
// limited guarantees.
const testKey1 = Math.random().toString(36).slice(2);
const testKey2 = Math.random().toString(36).slice(2);
storage.removeItem(testKey1);
storage.setItem(testKey2, 'foo');
return w.wait_for('storage')
.then(e => {
assert_equals(e.storageArea, iframeStorage);
assert_equals(e.key, testKey2);
assert_equals(e.newValue, 'foo');
});
}, 'Deleting non-existent key does not trigger event for ' + storageName);
promise_test(t => {
const w = new EventWatcher(t, iframe.contentWindow, 'storage');
// Random key to make sure we don't conflict with any cruft leftover from
// earlier runs. Any synchronization would be really hard with localStorage
// limited guarantees.
const testKey = Math.random().toString(36).slice(2);
storage.setItem(testKey, 'foo');
storage.clear();
storage.clear();
storage.setItem(testKey, 'bar');
return w.wait_for('storage')
.then(e => {
assert_equals(e.storageArea, iframeStorage);
assert_equals(e.key, testKey);
assert_equals(e.newValue, 'foo');
return w.wait_for('storage');
})
.then(e => {
assert_equals(e.storageArea, iframeStorage);
assert_equals(e.key, null);
assert_equals(e.oldValue, null);
assert_equals(e.newValue, null);
return w.wait_for('storage');
})
.then(e => {
assert_equals(e.storageArea, iframeStorage);
assert_equals(e.key, testKey);
assert_equals(e.oldValue, null);
assert_equals(e.newValue, 'bar');
});
}, 'Clearing empty storage does not trigger event for ' + storageName);
}
iframe.src = "resources/event_basic.html";
iframe.onload = () => {
tests('sessionStorage');
tests('localStorage');
};
document.body.appendChild(iframe);
</script>
</body>
</html>