[SwiftUI] [UnitTest] [Xcode] Xcode を使ったテストの始め方

//
//  EmptyTests.swift
//
//  Created by : Tomoaki Yagishita on 2020/11/11
//  © 2020  SmallDeskSoftware
//

// (1)
import XCTest

class EmptyTests: XCTestCase {
    // (2)
    override func setUpWithError() throws {
        // Put setup code here. This method is called before the invocation of each test method in the class.
    }
    // (3)
    override func tearDownWithError() throws {
        // Put teardown code here. This method is called after the invocation of each test method in the class.
    }
    // (4)
    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.
    }
    // (5)
    func testPerformanceExample() throws {
        // This is an example of a performance test case.
        measure {
            // Put the code you want to measure the time of here.
        }
    }

}

//
//  EmptyUITests.swift
//
//  Created by : Tomoaki Yagishita on 2020/11/11
//  © 2020  SmallDeskSoftware
//

// (1)
import XCTest

class EmptyUITests: XCTestCase {
    // (2)
    override func setUpWithError() throws {
        // Put setup code here. This method is called before the invocation of each test method in the class.

        // In UI tests it is usually best to stop immediately when a failure occurs.
        continueAfterFailure = false

        // In UI tests it’s important to set the initial state - such as interface orientation - required for your tests before they run. The setUp method is a good place to do this.
    }
    // (3)
    override func tearDownWithError() throws {
        // Put teardown code here. This method is called after the invocation of each test method in the class.
    }
    // (4)
    func testExample() throws {
        // UI tests must launch the application that they test.
        let app = XCUIApplication()
        app.launch()

        // Use recording to get started writing UI tests.
        // Use XCTAssert and related functions to verify your tests produce the correct results.
    }
    // (5)
    func testLaunchPerformance() throws {
        if #available(macOS 10.15, iOS 13.0, tvOS 13.0, *) {
            // This measures how long it takes to launch your application.
            measure(metrics: [XCTApplicationLaunchMetric()]) {
                XCUIApplication().launch()
            }
        }
    }
}

    func test_<#methodName#>_<#withCertainState#>_<#shouldDoSomething#>() {
　　    <#Arrange#><#,Act#><#,Assert#>
    }

//
//  #MyOwn#Tests.swift
//
//  Created by : Tomoaki Yagishita on 2020/11/11
//  © 2020  SmallDeskSoftware
//

import XCTest
@testable import #MyModule#

class #MyOwn#Tests: 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.
    }
}

//
//  #MyOwn#UITests.swift
//
//  Created by : Tomoaki Yagishita on 2020/11/11
//  © 2020  SmallDeskSoftware
//

import XCTest

class #MyOwn#UITests: XCTestCase {

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

        // In UI tests it is usually best to stop immediately when a failure occurs.
        continueAfterFailure = false

        // In UI tests it’s important to set the initial state - such as interface orientation - required for your tests before they run. The setUp method is a good place to do this.
    }

    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 {
        // UI tests must launch the application that they test.
        let app = XCUIApplication()
        app.launch()

        // Use recording to get started writing UI tests.
        // Use XCTAssert and related functions to verify your tests produce the correct results.
    }
}