src/third_party/web_platform_tests/screen-orientation/lock-basic.html - cobalt - Git at Google

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

 var previousOrientation = screen.orientation;

 test(function() {
     screen.orientation.unlock();
 }, "Test that screen.orientation.unlock() doesn't throw when there is no lock");

 async_test(function(t) {
     var orientations = ['any', 'portrait', 'landscape', 'portrait-secondary',
                         'landscape-primary', 'landscape-secondary', 'portrait-primary'];

     setOrientation = function(idx) {
         if( idx == orientations.length) {
             screen.orientation.unlock();
             t.done();
             return;
         }
         (function(i) {
             screen.orientation.lock(orientations[i]).then(function() {
                 setOrientation(i+1);
             },function() {});
         })(idx);
     };

     setOrientation(0);

 }, "Test that screen.orientation.lock returns a pending promise.");

 test(function() {
     assert_equals(screen.orientation, previousOrientation);
 }, "Test that screen.orientation.lock() is actually async");

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

	var previousOrientation = screen.orientation;

	test(function() {
	screen.orientation.unlock();
	}, "Test that screen.orientation.unlock() doesn't throw when there is no lock");

	async_test(function(t) {
	var orientations = ['any', 'portrait', 'landscape', 'portrait-secondary',
	'landscape-primary', 'landscape-secondary', 'portrait-primary'];

	setOrientation = function(idx) {
	if( idx == orientations.length) {
	screen.orientation.unlock();
	t.done();
	return;
	}
	(function(i) {
	screen.orientation.lock(orientations[i]).then(function() {
	setOrientation(i+1);
	},function() {});
	})(idx);
	};

	setOrientation(0);

	}, "Test that screen.orientation.lock returns a pending promise.");

	test(function() {
	assert_equals(screen.orientation, previousOrientation);
	}, "Test that screen.orientation.lock() is actually async");

	</script>
	</body>
	</html>