[SwiftUI] [UnitTest] テストの作り方 ( Text を例として)

//
//  TDDTextUITests.swift
//
//  Created by : Tomoaki Yagishita on 2020/10/27
//  © 2020  SmallDeskSoftware
//

import XCTest

class TDDTextUITests: XCTestCase {
  // (1)
  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.
  }
  
  // (2)
  override func tearDownWithError() throws {
    // Put teardown code here. This method is called after the invocation of each test method in the class.
  }
  
  // (3)
  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.
  }
  
  // (4)
  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 testLabelValue() throws {
    // UI tests must launch the application that they test.
    let app = XCUIApplication()
    app.launch()
    // (1)
    let text = app.staticTexts["TextHelloWorld"]
    // (2)
    XCTAssertTrue(text.exists)

    // (3)
    XCTAssertEqual(text.label, "Hello, world!")
  }

//
//  ContentView.swift
//
//  Created by : Tomoaki Yagishita on 2020/10/27
//  © 2020  SmallDeskSoftware
//

import SwiftUI

struct ContentView: View {
  var body: some View {
    Text("Hello, world!")
      .padding()
      .accessibility(identifier: "TextHelloWorld")
      // (1)
  }
}

XCTAssertEqual(text.label, "Hello, world!")