Import dom/ from web-platform-tests

third_party/WebKit/LayoutTests/imported/web-platform-tests/dom/nodes/Comment-Text-constructor.js

+function test_constructor(ctor) {
+  test(function() {
+    var object = new window[ctor]();
+    assert_equals(Object.getPrototypeOf(object),
+                  window[ctor].prototype, "Prototype chain: " + ctor);
+    assert_equals(Object.getPrototypeOf(Object.getPrototypeOf(object)),
+                  CharacterData.prototype, "Prototype chain: CharacterData");
+    assert_equals(Object.getPrototypeOf(Object.getPrototypeOf(Object.getPrototypeOf(object))),
+                  Node.prototype, "Prototype chain: Node");
+  }, "new " + ctor + "(): prototype chain");
+
+  test(function() {
+    var object = new window[ctor]();
+    assert_true(object instanceof Node, "Should be a Node");
+    assert_true(object instanceof CharacterData, "Should be a CharacterData");
+    assert_true(object instanceof window[ctor], "Should be a " + ctor);
+  }, "new " + ctor + "(): instanceof");
+
+  test(function() {
+    var object = new window[ctor]();
+    assert_equals(object.data, "");
+    assert_equals(object.nodeValue, "");
+    assert_equals(object.ownerDocument, document);
+  }, "new " + ctor + "(): no arguments");
+
+  var arguments = [
+    [undefined, ""],
+    [null, "null"],
+    [42, "42"],
+    ["", ""],
+    ["-", "-"],
+    ["--", "--"],
+    ["-->", "-->"],
+    ["<!--", "<!--"],
+    ["\u0000", "\u0000"],
+    ["\u0000test", "\u0000test"],
+    ["&amp;", "&amp;"],
+  ];
+
+  arguments.forEach(function(a) {
+    var argument = a[0], expected = a[1];
+    test(function() {
+      var object = new window[ctor](argument);
+      assert_equals(object.data, expected);
+      assert_equals(object.nodeValue, expected);
+      assert_equals(object.ownerDocument, document);
+    }, "new " + ctor + "(): " + format_value(argument));
+  });
+
+  test(function() {
+    var called = [];
+    var object = new window[ctor]({
+      toString: function() {
+        called.push("first");
+        return "text";
+      }
+    }, {
+      toString: function() {
+        called.push("second");
+        assert_unreached("Should not look at the second argument.");
+      }
+    });
+    assert_equals(object.data, "text");
+    assert_equals(object.nodeValue, "text");
+    assert_equals(object.ownerDocument, document);
+    assert_array_equals(called, ["first"]);
+  }, "new " + ctor + "(): two arguments")
+
+  async_test("new " + ctor + "() should get the correct ownerDocument across globals").step(function() {
+    var iframe = document.createElement("iframe");
+    iframe.onload = this.step_func_done(function() {
+      var object = new iframe.contentWindow[ctor]();
+      assert_equals(object.ownerDocument, iframe.contentDocument);
+    });
+    document.body.appendChild(iframe);
+  });
+}