iOS Tests

1. 创建项目，带着test；或者后期添加target

2. 继承XCTestCase，实现setUp，tearDown，testExample...

3. 异步处理，尤其是网络请求

1)

 [self waitForExpectationsWithTimeout:15.0 handler:nil];

2) 

XCTestExpectation *expectation = [self expectationWithDescription:@"Request should succeed"];

[expectationfulfill];

4. 修改scheme (test)