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假设我在同一个描述块中有两个测试用例，需要使用相同的服务，但每个测试用例都必须提供不同的服务存根？下面的示例将按预期为两个测试用例提供 serviceStub1，但我需要找到一种方法为第二个用例提供 serviceStub2。我已经花了很多时间在这上面，但到目前为止我迷路了。任何帮助将不胜感激，谢谢。

describe('Component: ComponentUnderTest', () => {

      const serviceStub1 = {
            method: () => value1;
      };

      const serviceStub2 = {
            method: () => value2;
      };

    beforeEach(() => {

        TestBed.configureTestingModule({
            declarations: [ComponentUnderTest],
            providers: [
                {provide: Service, useValue: serviceStub1},
            ]
        });

        fixture = TestBed.createComponent(ComponentUnderTest);
    });

    //should be tested with serviceStub1
    it("should do something when provider method returns value 1");

    //should be tested with serviceStub2
    it("should do something when provider method returns value 2");
});
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