Adding Angular and dependent packages for testing

third_party/pkg/angular/test/core/registry_spec.dart

+library registry_spec;
+
+import '../_specs.dart';
+
+main() => describe('RegistryMap', () {
+  it('should throw error on identical keys', () {
+    var module = new Module()
+        ..type(MyMap)
+        ..type(MetadataExtractor)
+        ..type(A1)
+        ..type(A2);
+
+    var injector = new DynamicInjector(modules: [module]);
+    expect(() {
+      injector.get(MyMap);
+    }).toThrow("Duplicate annotation found: MyAnnotation: A. Exisitng:");
+  });
+
+  it('should iterate over all types', () {
+    var module = new Module()
+      ..type(MyMap)
+      ..type(MetadataExtractor)
+      ..type(A1);
+
+    var injector = new DynamicInjector(modules: [module]);
+    var keys = [];
+    var types = [];
+    var map = injector.get(MyMap);
+    map.forEach((k, t) { keys.add(k); types.add(t); });
+    expect(keys).toEqual([new MyAnnotation('A'), new MyAnnotation('B')]);
+    expect(types).toEqual([A1, A1]);
+  });
+});
+
+class MyMap extends AnnotationMap<MyAnnotation> {
+  MyMap(Injector injector, MetadataExtractor metadataExtractor)
+      : super(injector, metadataExtractor);
+}
+
+
+class MyAnnotation {
+  final String name;
+
+  const MyAnnotation(String this.name);
+
+  toString() => name;
+  get hashCode => name.hashCode;
+  operator==(other) => this.name == other.name;
+}
+
+@MyAnnotation('A') @MyAnnotation('B') class A1 {}
+@MyAnnotation('A') class A2 {}