chromium/third_party/blink/web_tests/navigator_webdriver/navigator_webdriver_enabled.html

<!DOCTYPE html>
<body>
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
<script>

test(function() {
	assert_true(!!window.internals
		&& !!internals.runtimeFlags,
		"This test only works when run as a layout test!");
}, "Prerequisites to running the rest of the tests");

test(function () {
  assert_false(window.navigator.webdriver);
}, "Test if navigator.webdriver is false without automation");

internals.runtimeFlags.automationControlledEnabled = true;

test(function() {
  assert_true(internals.runtimeFlags.automationControlledEnabled);
  assert_true("webdriver" in window.navigator);
  assert_true(navigator.webdriver);
}, "Test if Navigator implements NavigatorAutomationInformation interface");


test(function() {
  const descriptor = Object.getOwnPropertyDescriptor(Navigator.prototype, "webdriver");
  assert_true(descriptor !== undefined);
  assert_true(descriptor.configurable);
  assert_true(descriptor.enumerable);
  assert_true(descriptor.set === undefined);
}, "Test that the navigator.webdriver descriptor has expected properties");
</script>
</body>
</html>