Add tests for Element#elements.

client/tests/client/html/ElementTests.dart

Index: client/tests/client/html/ElementTests.dart
diff --git a/client/tests/client/html/ElementTests.dart b/client/tests/client/html/ElementTests.dart
index d14f0625ad562f15cc7ff80c90004c04436a95fb..38c608a238f8e033b5db67c6c5e2521b619ec743 100644
--- a/client/tests/client/html/ElementTests.dart
+++ b/client/tests/client/html/ElementTests.dart
@@ -41,6 +41,11 @@ void testConstructorHelper(String tag, String htmlSnippet,
   Expect.equals(elementFromSnippet.text, expectedText);
 }
 
+Element makeElement() => new Element.tag('div');
+
+Element makeElementWithChildren() =>
+  new Element.html("<div><br/><img/><input/></div>");
+
 void testElement() { 
   asyncTest('computedStyle', 1, () {
     final element = document.body;
@@ -389,4 +394,145 @@ void testElement() {
     // attributes['style'] = 'width: 300px;';
     // Expect.equals(attributes.length, 5);*/
   });
+
+  group('elements', () {
+    test('is a subset of nodes', () {
+      var el = new Element.html("<div>Foo<br/><img/></div>");
+      Expect.equals(3, el.nodes.length);
+      Expect.equals(2, el.elements.length);
+      Expect.equals(el.nodes[1], el.elements[0]);
+      Expect.equals(el.nodes[2], el.elements[1]);
+    });
+
+    test('changes when an element is added to nodes', () {
+      var el = new Element.html("<div>Foo<br/><img/></div>");
+      el.nodes.add(new Element.tag('hr'));
+      Expect.equals(3, el.elements.length);
+      Expect.isTrue(el.elements[2] is HRElement);
+      Expect.equals(el.nodes[3], el.elements[2]);
+    });
+
+    test('changes nodes when an element is added', () {
+      var el = new Element.html("<div>Foo<br/><img/></div>");
+      el.elements.add(new Element.tag('hr'));
+      Expect.equals(4, el.nodes.length);
+      Expect.isTrue(el.nodes[3] is HRElement);
+      Expect.equals(el.elements[2], el.nodes[3]);
+    });
+
+    test('first', () {
+      var el = makeElementWithChildren();
+      Expect.isTrue(el.elements.first is BRElement);
+    });
+
+    test('last', () {
+      var el = makeElementWithChildren();
+      Expect.isTrue(el.elements.last() is InputElement);
+    });
+
+    test('forEach', () {
+      var els = [];
+      var el = makeElementWithChildren();
+      el.elements.forEach((n) => els.add(n));
+      Expect.isTrue(els[0] is BRElement);
+      Expect.isTrue(els[1] is ImageElement);
+      Expect.isTrue(els[2] is InputElement);
+    });
+
+    test('filter', () {
+      var filtered = makeElementWithChildren().elements.
+        filter((n) => n is ImageElement);
+      Expect.equals(1, filtered.length);
+      Expect.isTrue(filtered[0] is ImageElement);
+    });
+
+    test('every', () {
+      var el = makeElementWithChildren();
+      Expect.isTrue(el.elements.every((n) => n is Element));
+      Expect.isFalse(el.elements.every((n) => n is InputElement));
+    });
+
+    test('some', () {
+      var el = makeElementWithChildren();
+      Expect.isTrue(el.elements.some((n) => n is InputElement));
+      Expect.isFalse(el.elements.some((n) => n is SVGElement));
+    });
+
+    test('isEmpty', () {
+      Expect.isTrue(makeElement().elements.isEmpty());
+      Expect.isFalse(makeElementWithChildren().elements.isEmpty());
+    });
+
+    test('length', () {
+      Expect.equals(0, makeElement().elements.length);
+      Expect.equals(3, makeElementWithChildren().elements.length);
+    });
+
+    test('[]', () {
+      var el = makeElementWithChildren();
+      Expect.isTrue(el.elements[0] is BRElement);
+      Expect.isTrue(el.elements[1] is ImageElement);
+      Expect.isTrue(el.elements[2] is InputElement);
+    });
+
+    test('[]=', () {
+      var el = makeElementWithChildren();
+      el.elements[1] = new Element.tag('hr');
+      Expect.isTrue(el.elements[0] is BRElement);
+      Expect.isTrue(el.elements[1] is HRElement);
+      Expect.isTrue(el.elements[2] is InputElement);
+    });
+
+    test('add', () {
+      var el = makeElement();
+      el.elements.add(new Element.tag('hr'));
+      Expect.isTrue(el.elements.last() is HRElement);
+    });
+
+    test('addLast', () {
+      var el = makeElement();
+      el.elements.addLast(new Element.tag('hr'));
+      Expect.isTrue(el.elements.last() is HRElement);
+    });
+
+    test('iterator', () {
+      var els = [];
+      var el = makeElementWithChildren();
+      for (var subel in el.elements) {
+        els.add(subel);
+      }
+      Expect.isTrue(els[0] is BRElement);
+      Expect.isTrue(els[1] is ImageElement);
+      Expect.isTrue(els[2] is InputElement);
+    });
+
+    test('addAll', () {
+      var el = makeElementWithChildren();
+      el.elements.addAll([
+        new Element.tag('span'),
+        new Element.tag('a'),
+        new Element.tag('h1')
+      ]);
+      Expect.isTrue(el.elements[0] is BRElement);
+      Expect.isTrue(el.elements[1] is ImageElement);
+      Expect.isTrue(el.elements[2] is InputElement);
+      Expect.isTrue(el.elements[3] is SpanElement);
+      Expect.isTrue(el.elements[4] is AnchorElement);
+      Expect.isTrue(el.elements[5] is HeadingElement);
+    });
+
+    test('clear', () {
+      var el = makeElementWithChildren();
+      el.elements.clear();
+      Expect.listEquals([], el.elements);
+    });
+
+    test('removeLast', () {
+      var el = makeElementWithChildren();
+      Expect.isTrue(el.elements.removeLast() is InputElement);
+      Expect.equals(2, el.elements.length);
+      Expect.isTrue(el.elements.removeLast() is ImageElement);
+      Expect.equals(1, el.elements.length);
+    });
+  });
 }