Add test coverage for the MessageEvent constructor (#3958)

Add test coverage for the MessageEvent constructor and check that MessageEvent's ports attribute is not nullable as per: - whatwg/html#1883 - whatwg/html#1882 Also cover MessageEvent's initMessageEvent operation.
web-platform-tests · Oct 11, 2016 · 07cc1c4 · 07cc1c4
1 parent b8f3c1c
commit 07cc1c4
Show file tree

Hide file tree

Showing 2 changed files with 80 additions and 2 deletions.
diff --git a/html/dom/interfaces.html b/html/dom/interfaces.html
@@ -2628,9 +2628,9 @@ <h1>HTML IDL tests</h1>
   readonly attribute DOMString origin;
   readonly attribute DOMString lastEventId;
   readonly attribute (WindowProxy or MessagePort)? source;
-  readonly attribute MessagePort[]? ports;
+  readonly attribute FrozenArray<MessagePort> ports;
 
-  void initMessageEvent(DOMString typeArg, boolean canBubbleArg, boolean cancelableArg, any dataArg, DOMString originArg, DOMString lastEventIdArg, (WindowProxy or MessagePort) sourceArg, MessagePort[]? portsArg);
+  void initMessageEvent(DOMString type, boolean bubbles, boolean cancelable, any data, DOMString origin, DOMString lastEventId, (WindowProxy or MessagePort) source, sequence<MessagePort> ports);
 };
 
 dictionary MessageEventInit : EventInit {

diff --git a/html/webappapis/scripting/events/messageevent-constructor.html b/html/webappapis/scripting/events/messageevent-constructor.html
@@ -0,0 +1,78 @@
+<!DOCTYPE html>
+<title>MessageEvent constructor</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+test(function() {
+  var ev = new MessageEvent("test")
+  assert_equals(ev.type, "test", "type attribute")
+  assert_equals(ev.target, null, "target attribute")
+  assert_equals(ev.currentTarget, null, "currentTarget attribute")
+  assert_equals(ev.eventPhase, Event.NONE, "eventPhase attribute")
+  assert_equals(ev.bubbles, false, "bubbles attribute")
+  assert_equals(ev.cancelable, false, "cancelable attribute")
+  assert_equals(ev.defaultPrevented, false, "defaultPrevented attribute")
+  assert_equals(ev.isTrusted, false, "isTrusted attribute")
+  assert_true(ev.timeStamp > 0, "timeStamp attribute")
+  assert_true("initMessageEvent" in ev, "initMessageEvent operation")
+  assert_equals(ev.data, null, "data attribute")
+  assert_equals(ev.origin, "", "origin attribute")
+  assert_equals(ev.lastEventId, "", "lastEventId attribute")
+  assert_equals(ev.source, null, "source attribute")
+  assert_array_equals(ev.ports, [], "ports attribute")
+}, "Default event values")
+
+test(function() {
+  var channel = new MessageChannel()
+  var ev = new MessageEvent("test", { data: "testData", origin: "testOrigin", lastEventId: "testId", source: window, ports: [channel.port1] })
+  assert_equals(ev.type, "test", "type attribute")
+  assert_equals(ev.data, "testData", "data attribute")
+  assert_equals(ev.origin, "testOrigin", "origin attribute")
+  assert_equals(ev.lastEventId, "testId", "lastEventId attribute")
+  assert_equals(ev.source, window, "source attribute")
+  assert_array_equals(ev.ports, [channel.port1], "ports attribute")
+}, "MessageEventInit dictionary")
+
+test(function() {
+  assert_throws(new TypeError(), function() {
+    new MessageEvent("test", { ports: null })
+  })
+}, "Passing null for ports member")
+
+test(function() {
+  var ev = new MessageEvent("test", { ports: [] })
+  assert_true(Array.isArray(ev.ports), "Array.isArray() should return true")
+  assert_true(Object.isFrozen(ev.ports), "Object.isFrozen() should return true")
+  assert_true(ev.ports === ev.ports, "ev.ports should return the same object")
+}, "ports attribute should be a FrozenArray")
+
+test(function() {
+  var ev = document.createEvent("messageevent");
+  var channel = new MessageChannel()
+  ev.initMessageEvent("test", true, false, "testData", "testOrigin", "testId", window, [channel.port1])
+  assert_equals(ev.type, "test", "type attribute")
+  assert_equals(ev.bubbles, true, "bubbles attribute")
+  assert_equals(ev.cancelable, false, "bubbles attribute")
+  assert_equals(ev.data, "testData", "data attribute")
+  assert_equals(ev.origin, "testOrigin", "origin attribute")
+  assert_equals(ev.lastEventId, "testId", "lastEventId attribute")
+  assert_equals(ev.source, window, "source attribute")
+  assert_array_equals(ev.ports, [channel.port1], "ports attribute")
+}, "initMessageEvent operation")
+
+test(function() {
+  var ev = document.createEvent("messageevent")
+  assert_throws(new TypeError(), function() {
+    ev.initMessageEvent("test", true, false, "testData", "testOrigin", "testId", window, null)
+  })
+}, "Passing null for ports parameter to initMessageEvent")
+
+test(function() {
+  var ev = document.createEvent("messageevent")
+  assert_equals(MessageEvent.prototype.initMessageEvent.length, 8, "MessageEvent.prototype.initMessageEvent.length should be 8")
+  assert_throws(new TypeError(), function() {
+    ev.initMessageEvent("test", true, false, "testData", "testOrigin", "testId", window)
+  }, "Calling initMessageEvent with only 7 parameters should throw a TypeError")
+}, "All parameters to initMessageEvent should be mandatory")
+
+</script>