Add (failing) source_update_test.dart.

dart/tests/try/cursor_position_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // SharedOptions=--package-root=sdk/lib/_internal/
 
 // Test that cursor positions are correctly updated after adding new content.
 
-library trydart.cursor_position_test;
-
-import 'dart:html';
-import 'dart:async';
-
-import '../../site/try/src/interaction_manager.dart' show
-    InteractionManager;
-
-import '../../site/try/src/ui.dart' show
-    hackDiv,
-    mainEditorPane,
-    observer;
-
-import '../../site/try/src/user_option.dart' show
-    UserOption;
-
-import '../../pkg/expect/lib/expect.dart';
-
-import '../../pkg/async_helper/lib/async_helper.dart';
+import 'test_try.dart';
 
 void main() {
   InteractionManager interaction = mockTryDartInteraction();
 
-  List<TestCase> tests = <TestCase>[
+  runTests(<TestCase>[
 
     new TestCase('Test adding two lines programmatically.', () {
       clearEditorPaneWithoutNotifications();
       mainEditorPane.appendText('\n\n');
       Text text = mainEditorPane.firstChild;
       window.getSelection().collapse(text, 1);
       checkSelectionIsCollapsed(text, 1);
     }, checkAtBeginningOfSecondLine),
 
     new TestCase('Test adding a new line with mock key event.', () {
       clearEditorPaneWithoutNotifications();
       checkSelectionIsCollapsed(mainEditorPane, 0);
       simulateEnterKeyDown(interaction);
     }, checkAtBeginningOfSecondLine),
 
-  ];
-
-  runTests(tests.iterator, completerForAsyncTest());
+  ]);
 }
 
 void simulateEnterKeyDown(InteractionManager interaction) {
   interaction.onKeyUp(
       new MockKeyboardEvent('keydown', keyCode: KeyCode.ENTER));
 }
 
-void clearEditorPaneWithoutNotifications() {
-  mainEditorPane.nodes.clear();
-  observer.takeRecords();
-}
-
 void checkSelectionIsCollapsed(Node node, int offset) {
   var selection = window.getSelection();
   Expect.isTrue(selection.isCollapsed, 'selection.isCollapsed');
   Expect.equals(node, selection.anchorNode, 'selection.anchorNode');
   Expect.equals(offset, selection.anchorOffset, 'selection.anchorOffset');
 }
 
 void checkLineCount(int expectedLineCount) {
   Expect.equals(
       expectedLineCount, mainEditorPane.nodes.length,
       'mainEditorPane.nodes.length');
 }
 
 void checkAtBeginningOfSecondLine() {
   checkLineCount(2);
   checkSelectionIsCollapsed(mainEditorPane.nodes[1].firstChild, 0);
 }
 
-runTests(Iterator<TestCase> iterator, Completer completer) {
-  if (iterator.moveNext()) {
-    TestCase test = iterator.current;
-    new Future(() {
-      print('${test.description}\nSetup.');
-      test.setup();
-      new Future(() {
-        test.validate();
-        print('${test.description}\nDone.');
-        runTests(iterator, completer);
-      });
-    });
-  } else {
-    completer.complete(null);
-  }
-}
-
-Completer completerForAsyncTest() {
-  Completer completer = new Completer();
-  asyncTest(() => completer.future.then((_) {
-    // Clear the DOM to work around a bug in test.dart.
-    document.body.nodes.clear();
-  }));
-  return completer;
-}
-
-InteractionManager mockTryDartInteraction() {
-  UserOption.storage = {};
-
-  InteractionManager interaction = new InteractionManager();
-
-  hackDiv = new DivElement();
-  mainEditorPane = new DivElement()
-      ..style.whiteSpace = 'pre'
-      ..contentEditable = 'true';
-
-  observer = new MutationObserver(interaction.onMutation);
-  observer.observe(
-      mainEditorPane, childList: true, characterData: true, subtree: true);
-
-  document.body.nodes.addAll([mainEditorPane, hackDiv]);
-
-  return interaction;
-}
-
 class MockKeyboardEvent extends KeyEvent {
   final int keyCode;
 
   MockKeyboardEvent(String type, {int keyCode})
       : this.keyCode = keyCode,
         super.wrap(new KeyEvent(type, keyCode: keyCode));
 
   bool getModifierState(String keyArgument) => false;
 }
-
-typedef void VoidFunction();
-
-class TestCase {
-  final String description;
-  final VoidFunction setup;
-  final VoidFunction validate;
-
-  TestCase(this.description, this.setup, this.validate);
-}