Adding Angular and dependent packages for testing

third_party/pkg/angular/test/angular_spec.dart

+library angular_spec;
+
+import '_specs.dart';
+import 'package:angular/utils.dart';
+
+main() {
+  describe('angular.dart unittests', () {
+    it('should run in checked moded only', () {
+      expect(() {
+        dynamic v = 6;
+        String s = v;
+      }).toThrow();
+    });
+  });
+
+  describe('relaxFnApply', () {
+    it('should work with 6 arguments', () {
+      var sixArgs = [1, 1, 2, 3, 5, 8];
+      expect(relaxFnApply(() => "none", sixArgs)).toEqual("none");
+      expect(relaxFnApply((a) => a, sixArgs)).toEqual(1);
+      expect(relaxFnApply((a, b) => a + b, sixArgs)).toEqual(2);
+      expect(relaxFnApply((a, b, c) => a + b + c, sixArgs)).toEqual(4);
+      expect(relaxFnApply((a, b, c, d) => a + b + c + d, sixArgs)).toEqual(7);
+      expect(relaxFnApply((a, b, c, d, e) => a + b + c + d + e, sixArgs)).toEqual(12);
+    });
+
+    it('should work with 0 arguments', () {
+      var noArgs = [];
+      expect(relaxFnApply(() => "none", noArgs)).toEqual("none");
+      expect(relaxFnApply(([a]) => a, noArgs)).toEqual(null);
+      expect(relaxFnApply(([a, b]) => b, noArgs)).toEqual(null);
+      expect(relaxFnApply(([a, b, c]) => c, noArgs)).toEqual(null);
+      expect(relaxFnApply(([a, b, c, d]) => d, noArgs)).toEqual(null);
+      expect(relaxFnApply(([a, b, c, d, e]) => e, noArgs)).toEqual(null);
+    });
+
+    it('should fail with not enough arguments', () {
+      expect(() {
+        relaxFnApply((required, alsoRequired) => "happy", [1]);
+      }).toThrow('Unknown function type, expecting 0 to 5 args.');
+    });
+  });
+}