XCTest

0、Command+5，click + at the bottom left corner then choose New Unit Test Target… to add test target or choose New Unit Test Class… to add test class.
New Test Target

1、Replace None with Pods in Project->Info->Configurations. Add Prefix Header in Test Target->BuildSettings like project target. Configure Project Info

2、Write some testing methods with names beginning with test in test class then Command+U to check all classes or click Run button in the gutter to check single class or single method.

- (void)setUp {
    [super setUp];
    // Put setup code here. This method is called before the invocation of each test method in the class.
}

- (void)tearDown {
    // Put teardown code here. This method is called after the invocation of each test method in the class.
    [super tearDown];
}

- (void)testExample {
    // This is an example of a functional test case.
    // Use XCTAssert and related functions to verify your tests produce the correct results.
}

- (void)testPerformanceExample {
    // This is an example of a performance test case.
    [self measureBlock:^{
        // Put the code you want to measure the time of here.
    }];
}