angular.js/test/InjectorSpec.js

describe('injector', function(){
  var providers;
  var cache;
  var inject;
  var scope;

  beforeEach(function(){
    providers = extensionMap({}, 'providers');
    cache = {};
    scope = {};
    inject = createInjector(scope, providers, cache);
  });

  it("should return same instance from calling provider", function(){
    providers('text', function(){ return scope.name; });
    scope.name = 'abc';
    expect(inject('text')).toEqual('abc');
    expect(cache.text).toEqual('abc');
    scope.name = 'deleted';
    expect(inject('text')).toEqual('abc');
  });

  it("should return an array of instances", function(){
    cache.a = 0;
    providers('b', function(){return 2;});
    expect(inject(['a', 'b'])).toEqual([0,2]);
  });

  it("should call function", function(){
    providers('a', function(){return 1;});
    providers('b', function(){return 2;});
    var args;
    function fn(a, b, c, d) {
      args = [this, a, b, c, d];
    }
    fn.$inject = ['a', 'b'];
    inject(fn, {name:"this"}, 3, 4);
    expect(args).toEqual([{name:'this'}, 1, 2, 3, 4]);
  });

  it('should inject providers', function(){
    providers('a', function(){return this.mi = 'Mi';});
    providers('b', function(mi){return this.name = mi+'sko';}, {$inject:['a']});
    expect(inject('b')).toEqual('Misko');
    expect(scope).toEqual({mi:'Mi', name:'Misko'});
  });

  it('should provide usefull message if no provider', function(){
    assertThrows("Unknown provider for 'idontexist'.", function(){
      inject('idontexist');
    });
  });

  it('should autostart eager services', function(){
    var log = '';
    providers('eager', function(){log += 'eager;'; return 'foo'}, {$eager: true});
    inject();
    expect(log).toEqual('eager;');
    expect(inject('eager')).toBe('foo');
  });
});