Adding Angular and dependent packages for testing

third_party/pkg/angular/test/io/expression_extractor_spec.dart

+library ng.tool.expression_extractor_spec;
+
+import 'package:di/di.dart';
+import 'package:di/dynamic_injector.dart';
+import 'package:angular/tools/common.dart';
+import 'package:angular/tools/io.dart';
+import 'package:angular/tools/io_impl.dart';
+import 'package:angular/tools/source_crawler_impl.dart';
+import 'package:angular/tools/html_extractor.dart';
+import 'package:angular/tools/source_metadata_extractor.dart';
+import '../jasmine_syntax.dart';
+import 'package:unittest/unittest.dart';
+
+main() => describe('expression_extractor', () {
+  it('should extract all expressions from source and templates', () {
+    Module module = new Module();
+
+    Injector injector = new DynamicInjector(modules: [module],
+        allowImplicitInjection: true);
+
+    IoService ioService = new IoServiceImpl();
+    var sourceCrawler = new SourceCrawlerImpl(['packages/']);
+    var sourceMetadataExtractor = new SourceMetadataExtractor(sourceCrawler);
+    List<DirectiveInfo> directives =
+        sourceMetadataExtractor
+            .gatherDirectiveInfo('test/io/test_files/main.dart');
+    var htmlExtractor = new HtmlExpressionExtractor(directives, ioService);
+    htmlExtractor.crawl('test/io/test_files/');
+
+    var expressions = htmlExtractor.expressions;
+    expect(expressions, unorderedEquals([
+      'ctrl.expr',
+      'ctrl.anotherExpression',
+      'ctrl.callback',
+      'ctrl.twoWayStuff',
+      'attr',
+      'expr',
+      'anotherExpression',
+      'callback',
+      'twoWayStuff',
+      'exported + expression',
+      'ctrl.inline.template.expression',
+      'ngIfCondition',
+      'ctrl.if'
+    ]));
+  });
+});