装饰器中的 Angular2 测试数据

Question

我有一个组件，我想在单元测试中检查选择器

@Component({
     selector: 'my-component',
)}

我想这样测试

describe('My Component', function(){ 
   it('should have a selector', function() {
      expect( ___ ).toBe('my-component');
   }); 
)}

Answer 1

您需要使用 Reflect Metadata 才能访问这些提示。假设组件的类是 MyComponent，您可以这样做来测试选择器:

describe('My Component', function(){ 
  it('should have a selector', function() {
    var annotations = Reflect.getMetadata('annotations', MyComponent);
    // Supposing the first annotations is of type ComponentMetadata
    expect(annotations[0].selector).toBe('my-component');
  });
});

查看此插件:https://plnkr.co/edit/HQc1qt?p=preview .