回调方法的单元测试用例 ios

Question

我的应用程序中有以下方法，我需要为其编写单元测试用例。
谁能建议我如何测试是否调用了成功块或错误块。

- (IBAction)loginButtonTapped:(id)sender
{
    void (^SuccessBlock)(id, NSDictionary*) = ^(id response, NSDictionary* headers) {
        [self someMethod];
    };

    void (^ErrorBlock)(id, NSDictionary*, id) = ^(NSError* error, NSDictionary* headers, id response) {
        // some code
    };

    [ServiceClass deleteWebService:@“http://someurl"
                              data:nil
                  withSuccessBlock:SuccessBlock
                    withErrorBlock:ErrorBlock];
}

Answer 1

你必须使用 expectations，这是最近才引入的 API。添加它们是为了准确解决您现在遇到的问题，验证调用异步方法的回调。

请注意，您还可以设置会影响测试结果的超时（例如，慢速网络连接可能会引发误报，当然，除非您正在检查慢速连接，尽管有更好的方法可以做到那个）。

- (void)testThatCallbackIsCalled {

    // Given
    XCTestExpectation *expectation = [self expectationWithDescription:@"Expecting Callback"];

    // When
    void (^SuccessBlock)(id, NSDictionary*) = ^(id response, NSDictionary* headers) {

        // Then
        [self someMethod];
        [expectation fulfill]; // This tells the test that your expectation was fulfilled i.e. the callback was called.
    };

    void (^ErrorBlock)(id, NSDictionary*, id) = ^(NSError* error, NSDictionary* headers, id response) {

     // some code

    };

    [ServiceClass deleteWebService:@“http://someurl"

                                           data:nil

                               withSuccessBlock:SuccessBlock

                                 withErrorBlock:ErrorBlock];
    };

    // Here we set the timeout, play around to find what works best for your case to avoid false positives.
    [self waitForExpectationsWithTimeout:2.0 handler:nil];

}

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