1 files changed, 81 insertions, 0 deletions
diff --git a/dom/tests/mochitest/webcomponents/htmlconstructor_autonomous_tests.js b/dom/tests/mochitest/webcomponents/htmlconstructor_autonomous_tests.js
new file mode 100644
index 000000000..636d9aff6
--- /dev/null
+++ b/dom/tests/mochitest/webcomponents/htmlconstructor_autonomous_tests.js
@@ -0,0 +1,81 @@
+promises.push(test_with_new_window((testWindow) => {
+  // Test calling the HTMLElement constructor.
+  (() => {
+    SimpleTest.doesThrow(() => {
+      testWindow.HTMLElement();
+    }, 'calling the HTMLElement constructor should throw a TypeError');
+  })();
+
+  // Test constructing a HTMLELement.
+  (() => {
+    SimpleTest.doesThrow(() => {
+      new testWindow.HTMLElement();
+    }, 'constructing a HTMLElement should throw a TypeError');
+  })();
+
+  // Test constructing a custom element with defining HTMLElement as entry.
+  (() => {
+    testWindow.customElements.define('x-defining-html-element',
+                                     testWindow.HTMLElement);
+    SimpleTest.doesThrow(() => {
+      new testWindow.HTMLElement();
+    }, 'constructing a custom element with defining HTMLElement as registry ' +
+       'entry should throw a TypeError');
+  })();
+
+  // Test calling a custom element constructor and constructing an autonomous
+  // custom element.
+  (() => {
+    let num_constructor_invocations = 0;
+    class X extends testWindow.HTMLElement {
+      constructor() {
+        super();
+        num_constructor_invocations++;
+      }
+    }
+    testWindow.customElements.define('x-element', X);
+    SimpleTest.doesThrow(() => {
+      X();
+    }, 'calling an autonomous custom element constructor should throw a TypeError');
+
+    let element = new X();
+    SimpleTest.is(Object.getPrototypeOf(Cu.waiveXrays(element)), X.prototype,
+                  'constructing an autonomous custom element; ' +
+                  'the element should be a registered constructor');
+    SimpleTest.is(element.localName, 'x-element',
+                  'constructing an autonomous custom element; ' +
+                  'the element tag name should be "x-element"');
+    SimpleTest.is(element.namespaceURI, 'http://www.w3.org/1999/xhtml',
+                  'constructing an autonomous custom element; ' +
+                  'the element should be in the HTML namespace');
+    SimpleTest.is(element.prefix, null,
+                  'constructing an autonomous custom element; ' +
+                  'the element name should not have a prefix');
+    SimpleTest.is(element.ownerDocument, testWindow.document,
+                  'constructing an autonomous custom element; ' +
+                  'the element should be owned by the registry\'s associated ' +
+                  'document');
+    SimpleTest.is(num_constructor_invocations, 1,
+                  'constructing an autonomous custom element; ' +
+                  'the constructor should have been invoked once');
+  })();
+
+  // Test if prototype is no an object.
+  (() => {
+    function ElementWithNonObjectPrototype() {
+      let o = Reflect.construct(testWindow.HTMLElement, [], new.target);
+      SimpleTest.is(Object.getPrototypeOf(Cu.waiveXrays(o)), window.HTMLElement.prototype,
+                    'constructing an autonomous custom element; ' +
+                    'if prototype is not object, fallback from NewTarget\'s realm');
+    }
+
+     // Prototype have to be an object during define(), otherwise define will
+     // throw an TypeError exception.
+    ElementWithNonObjectPrototype.prototype = {};
+    testWindow.customElements.define('x-non-object-prototype',
+                                     ElementWithNonObjectPrototype);
+
+    ElementWithNonObjectPrototype.prototype = "string";
+    new ElementWithNonObjectPrototype();
+  })();
+}));