Writing UI Test For SwiftUI

Setting up the project

To start writing UI tests, we first need to set up a project with SwiftUI views. We can create a new SwiftUI project in Xcode by selecting “File” > “New” > “Project” and choosing “App” as the project template.

Once we have created the project, we can add a new UI test target to it. To do this, we select “File” > “New” > “Target” and choose “UI Test” as the target template.

https://developer.apple.com/tutorials/app-dev-training

Writing UI tests

Now that we have our project set up, we can start writing UI tests for our SwiftUI views. We will use XCTestCases to write our tests.

To begin, we create a new XCTestCase class and add a test method to it. In the test method, we can instantiate our SwiftUI view and perform actions on it, such as tapping buttons or entering text into text fields.

For example, let’s say we have a SwiftUI view with a button that toggles a boolean value when tapped. We can write a test method to verify that the button works as intended:

func testToggleButton() throws {
  let app = XCUIApplication()
  app.launch()

  // Find the button and tap it
  let button = app.buttons["Toggle"]
  button.tap()

  // Verify that the boolean value has been toggled
  let label = app.staticTexts["ValueLabel"]
  XCTAssertEqual(label.label, "Value: true")
}

In this example, we use XCUIApplication to launch the app and find the button and label elements using their accessibility identifiers. We then tap the button and use XCTAssertEqual to verify that the label text has changed to reflect the new boolean value.

To see all the options that we have on the UI, set a break point in our test, then run po app in the console. This will provide us with all the elements currently in the view.

Using the accessibilityIdentifier

When writing UI tests for SwiftUI views, it is important to use the accessibilityIdentifier property to give our UI elements unique identifiers. This allows us to easily find and interact with them in our test code.

To set the accessibilityIdentifier for a SwiftUI view, we can add the accessibility modifier to the view and set the identifier property:

Button("Toggle") {
  value.toggle()
}
.accessibility(identifier: "ToggleButton")

In our test code, we can then find the button using its identifier:

let button = app.buttons["ToggleButton"]

Using unique accessibility identifiers ensures that our UI tests are reliable and maintainable, even if the UI layout changes.

Conclusion

In this article, we have explored how to write UI tests for SwiftUI views using XCTestCases. By setting up our project with a UI test target and using unique accessibility identifiers for our UI elements, we can write reliable and maintainable tests to ensure that our SwiftUI views function as intended.

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