Handle interruptions and alerts in UI tests

5:04 - Interruption Handler Skeleton

addUIInterruptionMonitor(withDescription: "Handle recipe update failures") { element -> Bool in
    // TODO: Use this handler to retry the update action
    return false
}

5:16 - UI Test Method Body

func testRecipeDetailsNavigation() throws {

    let app = XCUIApplication()
    app.launch()

    let pancakeRecipe = app.cells.staticTexts["Fluffy Pancakes"].firstMatch
    pancakeRecipe.tap()

    // In the detail view
    let detailTitle = app.navigationBars.staticTexts["Fluffy Pancakes"].firstMatch
    XCTAssert(detailTitle.waitForExistence(timeout: 30))

    let expectedImage = app.images["Fluffy Pancakes Image"].firstMatch
    XCTAssert(expectedImage.exists)

    let ingredientsTitle = app.staticTexts["Ingredients Title"].firstMatch
    XCTAssert(ingredientsTitle.exists)

    let ingredientsContent = app.textViews["Ingredients Content"].firstMatch
    XCTAssert(ingredientsContent.exists)
    XCTAssert((ingredientsContent.value as! String).count > 0)

    let instructionsTitle = app.staticTexts["Instructions Title"].firstMatch
    XCTAssert(instructionsTitle.exists)

    let instructionsTextView = app.textViews["Instructions Content"].firstMatch
    XCTAssert(instructionsTextView.exists)
    XCTAssert((instructionsTextView.value as! String).count > 0)

    // Make sure we received the latest instructions:
    let expectedInstructions = """
                               1. Mix the flour, sugar, baking powder and salt.

                               2. Pour the milk, melted butter and egg into a well in the center and mix.

                               3. Heat a frying pan (don't forget to add a little bit of oil, grandson!), and fry until they're golden.

                               4. Optionally add maple syrup and/or fruits (they're healthy!).
                               """
    XCTAssertEqual((instructionsTextView.value as! String), expectedInstructions)

    // Go back to the list of recipes
    let backButton = app.navigationBars.buttons["Grandma's Recipes"].firstMatch
    backButton.tap()

    XCTAssert(pancakeRecipe.waitForExistence(timeout: 30))
}

6:20 - Modified Interruption Handler

addUIInterruptionMonitor(withDescription: "Handle recipe update failures") { element -> Bool in
    let retryButton = element.buttons["Retry"].firstMatch
    if element.elementType == .alert && retryButton.exists {
        retryButton.tap()
        return true
    } else {
        return false
    }
}

7:37 - Handle Expected Alerts

func testDeleteRecipe() throws {
    let breadCell = cell(recipeName: "Banana Bread")
    deleteCell(breadCell)

    let alert = app.alerts["Delete Recipe"].firstMatch
    let alertExists = alert.waitForExistence(timeout: 30)
    XCTAssert(alertExists, "Expected alert to show up")

    let description = """
                      Are you sure you want to \
                      delete this recipe?
                      """

    let alertDescription = alert.staticTexts[description]
    XCTAssert(alertDescription.exists)

    alert.buttons["Delete"].tap()
    XCTAssertFalse(breadCell.exists)
}

10:29 - Reset the Authorization Status of Protected Resources

func testAddingPhotosFirstTime() throws {
    let app = XCUIApplication()
    app.resetAuthorizationStatus(for: .photos)

    app.launch()

    // Test code…
}