開專案時加上 Tests Target

在開專案的時候要勾 Include Tests，這樣就會附上 Tests, UITests Targets。

如果是已經存在的專案，一開始並沒有勾 include tests，你還是可以在之後加上 test targets

在已經存在的專案，加上 Tests Target

step 1: 在專案下方的 Add Target 按 +

step 2: 選擇 Unit Testing Bundle

step 3: 在命名上，預設是你專案名後面加上 Tests，當然你也可以改成你想要的名字

step 4: 開始運行測試，確定一切正常

在增加 Target 後，專案會出現預設的 test code

import XCTest

final class YouNeedTestingTests: XCTestCase {

    override func setUpWithError() throws {
        // Put setup code here. This method is called before the invocation of each test method in the class.
    }

    override func tearDownWithError() throws {
        // Put teardown code here. This method is called after the invocation of each test method in the class.
    }

    func testExample() throws {
        // This is an example of a functional test case.
        // Use XCTAssert and related functions to verify your tests produce the correct results.
        // Any test you write for XCTest can be annotated as throws and async.
        // Mark your test throws to produce an unexpected failure when your test encounters an uncaught error.
        // Mark your test async to allow awaiting for asynchronous code to complete. Check the results with assertions afterwards.
    }

    func testPerformanceExample() throws {
        // This is an example of a performance test case.
        measure {
            // Put the code you want to measure the time of here.
        }
    }

}

試著選擇 Test Navigator 並按下 Test，確定 Unit Testing 能運作。這樣，就完成了在專案中加入 Unit Testing 步驟。

You need testing, and this is how you start testing.