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Test Info:

Test that NEL reports are not observable from JavaScript
<script src='/resources/testharness.js'></script>
<script src='/resources/testharnessreport.js'></script>
<script src='./support/nel.sub.js'></script>
nel_test(async t => {
// Register an observer for NEL reports.
var observer = new ReportingObserver((reports, _) => {
assert_unreached("NEL reports should not be observable");
}, {"types": ["network-error"]});
// Make a request to a resource whose response headers include a NEL
// policy. If NEL reports are observable, this will queue a task that
// calls the observer function above (which we don't want).
await fetchResourceWithBasicPolicy();
// Wait for one second to give any observer callback task a chance to
// fire.
await new Promise(resolve => t.step_timeout(resolve, 1000 /* msec */));