Ensure we run the observable transform on PolymerElement (fixes issue 14942)

pkg/observe/test/transform_test.dart

-// Copyright (c) 2013, 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.
-
-import 'dart:async';
-import 'package:barback/barback.dart';
-import 'package:observe/transform.dart';
-import 'package:unittest/compact_vm_config.dart';
-import 'package:unittest/unittest.dart';
-
-main() {
-  useCompactVMConfiguration();
-
-  group('replaces Observable for ChangeNotifier', () {
-    _testClause('extends Observable', 'extends ChangeNotifier');
-    _testClause('extends Base with Observable',
-        'extends Base with ChangeNotifier');
-    _testClause('extends Base<T> with Observable',
-        'extends Base<T> with ChangeNotifier');
-    _testClause('extends Base with Mixin, Observable',
-        'extends Base with Mixin, ChangeNotifier');
-    _testClause('extends Base with Observable, Mixin',
-        'extends Base with ChangeNotifier, Mixin');
-    _testClause('extends Base with Mixin<T>, Observable',
-        'extends Base with Mixin<T>, ChangeNotifier');
-    _testClause('extends Base with Mixin, Observable, Mixin2',
-        'extends Base with Mixin, ChangeNotifier, Mixin2');
-    _testClause('extends Observable implements Interface',
-        'extends ChangeNotifier implements Interface');
-    _testClause('extends Observable implements Interface<T>',
-        'extends ChangeNotifier implements Interface<T>');
-    _testClause('extends Base with Observable implements Interface',
-        'extends Base with ChangeNotifier implements Interface');
-    _testClause(
-        'extends Base with Mixin, Observable implements I1, I2',
-        'extends Base with Mixin, ChangeNotifier implements I1, I2');
-  });
-
-  group('adds "with ChangeNotifier" given', () {
-    _testClause('', 'extends ChangeNotifier');
-    _testClause('extends Base', 'extends Base with ChangeNotifier');
-    _testClause('extends Base<T>', 'extends Base<T> with ChangeNotifier');
-    _testClause('extends Base with Mixin',
-        'extends Base with Mixin, ChangeNotifier');
-    _testClause('extends Base with Mixin<T>',
-        'extends Base with Mixin<T>, ChangeNotifier');
-    _testClause('extends Base with Mixin, Mixin2',
-        'extends Base with Mixin, Mixin2, ChangeNotifier');
-    _testClause('implements Interface',
-        'extends ChangeNotifier implements Interface');
-    _testClause('implements Interface<T>',
-        'extends ChangeNotifier implements Interface<T>');
-    _testClause('extends Base implements Interface',
-        'extends Base with ChangeNotifier implements Interface');
-    _testClause('extends Base with Mixin implements I1, I2',
-        'extends Base with Mixin, ChangeNotifier implements I1, I2');
-  });
-
-  group('fixes contructor calls ', () {
-    _testInitializers('this.a', '(a) : __\$a = a');
-    _testInitializers('{this.a}', '({a}) : __\$a = a');
-    _testInitializers('[this.a]', '([a]) : __\$a = a');
-    _testInitializers('this.a, this.b', '(a, b) : __\$a = a, __\$b = b');
-    _testInitializers('{this.a, this.b}', '({a, b}) : __\$a = a, __\$b = b');
-    _testInitializers('[this.a, this.b]', '([a, b]) : __\$a = a, __\$b = b');
-    _testInitializers('this.a, [this.b]', '(a, [b]) : __\$a = a, __\$b = b');
-    _testInitializers('this.a, {this.b}', '(a, {b}) : __\$a = a, __\$b = b');
-  });
-
-  for (var annotation in ['observable', 'published']) {
-    group('@$annotation full text', () {
-      test('with changes', () {
-        return _transform(_sampleObservable(annotation)).then(
-            (out) => expect(out, _sampleObservableOutput(annotation)));
-      });
-
-      test('complex with changes', () {
-        return _transform(_complexObservable(annotation)).then(
-            (out) => expect(out, _complexObservableOutput(annotation)));
-      });
-
-      test('no changes', () {
-        var input = 'class A {/*@$annotation annotation to trigger transform */;}';
-        return _transform(input).then((output) => expect(output, input));
-      });
-    });
-  }
-}
-
-_testClause(String clauses, String expected) {
-  test(clauses, () {
-    var className = 'MyClass';
-    if (clauses.contains('<T>')) className += '<T>';
-    var code = '''
-      class $className $clauses {
-        @observable var field;
-      }''';
-
-    return _transform(code).then((output) {
-      var classPos = output.indexOf(className) + className.length;
-      var actualClauses = output.substring(classPos,
-        output.indexOf('{')).trim().replaceAll('  ', ' ');
-      expect(actualClauses, expected);
-    });
-  });
-}
-
-_testInitializers(String args, String expected) {
-  test(args, () {
-    var constructor = 'MyClass(';
-    var code = '''
-        class MyClass {
-          @observable var a;
-          @observable var b;
-          MyClass($args);
-        }''';
-
-    return _transform(code).then((output) {
-      var begin = output.indexOf(constructor) + constructor.length - 1;
-      var end = output.indexOf(';', begin);
-      if (end == -1) end = output.length;
-      var init = output.substring(begin, end).trim().replaceAll('  ', ' ');
-      expect(init, expected);
-    });
-  });
-}
-
-/** Helper that applies the transform by creating mock assets. */
-Future<String> _transform(String code) {
-  var id = new AssetId('foo', 'a/b/c.dart');
-  var asset = new Asset.fromString(id, code);
-  var transformer = new ObservableTransformer();
-  return transformer.isPrimary(asset).then((isPrimary) {
-    expect(isPrimary, isTrue);
-    var transform = new _MockTransform(asset);
-    return transformer.apply(transform).then((_) {
-      expect(transform.outs, hasLength(1));
-      expect(transform.outs[0].id, id);
-      return transform.outs.first.readAsString();
-    });
-  });
-}
-
-class _MockTransform implements Transform {
-  List<Asset> outs = [];
-  Asset _asset;
-  TransformLogger logger = new TransformLogger(_mockLogFn);
-  Asset get primaryInput => _asset;
-
-  _MockTransform(this._asset);
-  Future<Asset> getInput(AssetId id) {
-    if (id == primaryInput.id) return new Future.value(primaryInput);
-    fail('_MockTransform fail');
-  }
-
-  void addOutput(Asset output) {
-    outs.add(output);
-  }
-
-  readInput(id) => throw new UnimplementedError();
-  readInputAsString(id, {encoding}) => throw new UnimplementedError();
-
-  static void _mockLogFn(AssetId asset, LogLevel level, String message,
-                         span) {
-    // Do nothing.
-  }
-}
-
-String _sampleObservable(String annotation) => '''
-library A_foo;
-import 'package:observe/observe.dart';
-
-class A extends Observable {
-  @$annotation int foo;
-  A(this.foo);
-}
-''';
-
-String _sampleObservableOutput(String annotation) =>
-    "library A_foo;\n"
-    "import 'package:observe/observe.dart';\n\n"
-    "class A extends ChangeNotifier {\n"
-    "  @reflectable @$annotation int get foo => __\$foo; int __\$foo; "
-      "${_makeSetter('int', 'foo')}\n"
-    "  A(foo) : __\$foo = foo;\n"
-    "}\n";
-
-_makeSetter(type, name) => '@reflectable set $name($type value) { '
-    '__\$$name = notifyPropertyChange(#$name, __\$$name, value); }';
-
-String _complexObservable(String annotation) => '''
-class Foo extends Observable {
-  @$annotation
-  @otherMetadata
-      Foo
-          foo/*D*/= 1, bar =/*A*/2/*B*/,
-          quux/*C*/;
-
-  @$annotation var baz;
-}
-''';
-
-String _complexObservableOutput(String meta) =>
-    "class Foo extends ChangeNotifier {\n"
-    "  @reflectable @$meta\n"
-    "  @otherMetadata\n"
-    "      Foo\n"
-    "          get foo => __\$foo; Foo __\$foo/*D*/= 1; "
-        "${_makeSetter('Foo', 'foo')} "
-        "@reflectable @$meta @otherMetadata Foo get bar => __\$bar; "
-        "Foo __\$bar =/*A*/2/*B*/; ${_makeSetter('Foo', 'bar')}\n"
-    "          @reflectable @$meta @otherMetadata Foo get quux => __\$quux; "
-        "Foo __\$quux/*C*/; ${_makeSetter('Foo', 'quux')}\n\n"
-    "  @reflectable @$meta dynamic get baz => __\$baz; dynamic __\$baz; "
-        "${_makeSetter('dynamic', 'baz')}\n"
-    "}\n";