Upstream service worker message event tests to WPT

third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/ServiceWorkerGlobalScope/resources/extendable-message-event.js

+var wptEME = {};

[falken, 2017/03/17 15:37:48]

nit: This name is a bit inscrutable. Should we just expand it to
ExtendableMessageEventTest? I think it's more common for this kind of
namespace-like var to start with a capital letter too.

[mike3, 2017/03/17 16:31:41]

Yeah, probably developer ergonomics need to take a back seat here. I've
used the name `ExtendableMessageEventUtils` so that the file name can
match without confusion about the "test versus utility" distinction.

+
+/**
+ * Create a representation of a given ExtendableMessageEvent that is suitable
+ * for transmission via the `postMessage` API.
+ */

[falken, 2017/03/17 15:37:48]

nit: /* */ style comments are rare in Chromium and the service worker tests
upstreamed so far. I would use // unless there is an overriding WPT style guide.

[mike3, 2017/03/17 16:31:41]

Acknowledged.

+wptEME.serialize = function(event) {
+    var ports = event.ports.map(function(port) {
+            return { constructor: { name: port.constructor.name } };
+        });
+    return {
+            constructor: {
+                name: event.constructor.name
+            },
+            origin: event.origin,
+            lastEventId: event.lastEventId,
+            source: {
+                constructor: {
+                    name: event.source.constructor.name
+                },
+                url: event.source.url,
+                frameType: event.source.frameType,
+                visibilityState: event.source.visibilityState,
+                focused: event.source.focused
+            },
+            ports: ports
+        };
+};
+
+/**
+ * Compare the actual and expected values of an ExtendableMessageEvent that has
+ * been transformed using the `serialize` function defined in this file.
+ */
+wptEME.assert_equals = function(actual, expected) {
+    assert_equals(
+        actual.constructor.name, expected.constructor.name, 'event constructor'
+    );
+    assert_equals(actual.origin, expected.origin, 'event `origin` property');
+    assert_equals(
+        actual.lastEventId,
+        expected.lastEventId,
+        'event `lastEventId` property'
+    );
+
+    assert_equals(
+        actual.source.constructor.name,
+        expected.source.constructor.name,
+        'event `source` property constructor'
+    );
+    assert_equals(
+        actual.source.url, expected.source.url, 'event `source` property `url`'
+    );
+    assert_equals(
+        actual.source.frameType,
+        expected.source.frameType,
+        'event `source` property `frameType`'
+    );
+    assert_equals(
+        actual.source.visibilityState,
+        expected.source.visibilityState,
+        'event `source` property `visibilityState`'
+    );
+    assert_equals(
+        actual.source.focused,
+        expected.source.focused,
+        'event `source` property `focused`'
+    );
+
+    assert_equals(
+        actual.ports.length,
+        expected.ports.length,
+        'event `ports` property length'
+    );
+
+    for (var idx = 0; idx < expected.ports.length; ++idx) {
+        assert_equals(
+            actual.ports[idx].constructor.name,
+            expected.ports[idx].constructor.name,
+            'MessagePort #' + idx + ' constructor'
+        );
+    }
+};