feat(di): add support for optional dependencies

2015-02-27 07:42:51 -08:00
parent 23786aaa92
commit ba0a1ec459
7 changed files with 102 additions and 31 deletions
@@ -1,5 +1,5 @@
 import {describe, ddescribe, it, iit, expect, beforeEach} from 'angular2/test_lib';
-import {Injector, Inject, InjectLazy, bind} from 'angular2/di';
+import {Injector, Inject, InjectLazy, Optional, bind} from 'angular2/di';

 class Engine {
 }
@@ -34,6 +34,13 @@ class CarWithLazyEngine {
  }
 }

+class CarWithOptionalEngine {
+  engine;
+  constructor(@Optional() engine:Engine) {
+    this.engine = engine;
+  }
+}
+
 class CarWithDashboard {
  engine:Engine;
  dashboard:Dashboard;
@@ -159,6 +166,15 @@ export function main() {
      expect(car.engine).toBeAnInstanceOf(Engine);
    });

+    it('should support optional dependencies', function () {
+      var injector = new Injector([
+        CarWithOptionalEngine
+      ]);
+
+      var car = injector.get(CarWithOptionalEngine);
+      expect(car.engine).toEqual(null);
+    });
+
    it("should flatten passed-in bindings", function () {
      var injector = new Injector([
        [[Engine, Car]]