在 IOS 中使用异步代码编写单元测试答案

【问题标题】：Writing Unit Test with asynchronous code in IOS在 IOS 中使用异步代码编写单元测试
【发布时间】：2020-04-15 10:49:41
【问题描述】：

我需要在块返回单元测试完成之前测试我的 Api 调用响应如何测试我的 API

【问题讨论】：

标签： ios swift xcode

【解决方案1】：

您可以为此使用XCTestExpectation。

XCTestExpectation *apiCallExpectation = [self expectationWithDescription:@"APICall"];

[apiService apiCall:^(BOOL success) {
    XCTAssert(success);
    [apiCallExpectation fulfill];
}];

[self waitForExpectationsWithTimeout:5 handler:^(NSError *error) {
    [apiCallExpectation closeWithCompletionHandler:nil];
}];

【讨论】：

【解决方案2】：

在单元测试中，首先不需要调用实际的API，它应该是独立的，并且可以更快地完成。这应该是集成测试的一部分。

关于您的问题，我认为您需要使用 Expectations 和 Waiter。检查以下内容：

func testExample() {

  let responseExpectation = expectation(description: "response")

  // Your API Call shall be here
  DispatchQueue.main.async {

  // When you get the response, and want to finalize the expectation
  responseExpectation.fulfill()

  }

let result = XCTWaiter.wait(for: [responseExpectation], timeout: 15) // ex: 15 seconds to wait for the response for all expectations.

// result possible values are:

//all expectations were fulfilled before timeout.
.completed

//timed out before all of its expectations were fulfilled
.timedOut

//expectations were not fulfilled in the required order
.incorrectOrder

//an inverted expectation was fulfilled
.invertedFulfillment

//waiter was interrupted before completed or timedOut    
.interrupted

}

【讨论】：

【解决方案3】：

以下是我在搜索 api 上执行测试用例的示例。你需要声明期望，一旦完成就会得到满足。

func test_UpdateShowSearch_Result() {
        let promise = expectation(description: "Status code: 200")

        let searchAPI: SearchShowApi = SearchShowApi()

        searchAPI.search(query: "") { (statusCode, tvShows ,error) in
            if statusCode == 200 {

                // reload table
                promise.fulfill()

            } else if (statusCode == 204){
                // show no content
                XCTFail("Status code: \(statusCode)")
            }
            else{
                XCTFail("Error: \(String(describing:error?.localizedDescription))")
                return
            }

        }
        wait(for: [promise], timeout: 10)
    }

【讨论】：