File: midi-permission.html

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<!doctype html>
<meta charset=utf-8>
<title>Test WebIDL conversion when querying the "midi" permission</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<div id="log"></div>

<script>
  promise_test(async (test) => {
    let calledCount = 0;
    const status = await navigator.permissions.query({
      get name() {
        calledCount++;
        return "midi";
      },
    });
    assert_true(status instanceof PermissionStatus);
    assert_equals(status.name, "midi", `permission's name should be "midi"`);
    //
    // First call should be from:
    //
    //     Let rootDesc be the object permissionDesc refers to, converted to an
    //     IDL value of type PermissionDescriptor.
    //
    // Second from:
    //
    //     Let typedDescriptor be the object permissionDesc refers to,
    //     converted to an IDL value of rootDesc's name's permission descriptor
    //     type.
    //
    // See: https://w3c.github.io/permissions/#query-method
    //
    assert_equals(calledCount, 2, "midi permission should be converted twice");
  }, `querying the "midi" permission requires two WebIDL conversions`);
</script>