UI testing with XCUITest in iOS Swift - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ ui_behavior

intermediate

What is the result of this XCUITest code snippet?

Given the following Swift XCUITest code, what will be the value of button.exists after running?

iOS Swift

let app = XCUIApplication()
app.launch()
let button = app.buttons["Submit"]

// Assume the Submit button is present in the UI

let exists = button.exists

A false

B true

C Compilation error

D Runtime crash

💡 Hint

The button identifier matches an existing UI element.

The button.exists property returns true if the UI element is found in the app's UI hierarchy after launch.

❓ lifecycle

intermediate

When is the setUp() method called in an XCUITest class?

In XCUITest, at what point during the test execution is the setUp() method called?

A Before each test method runs

B After all test methods have run

C Only once before all tests start

D After each test method runs

💡 Hint

Think about preparing the app state for every test.

The setUp() method is called before each test method to prepare the environment fresh for every test.

📝 Syntax

advanced

What error does this XCUITest code produce?

Consider this code snippet in an XCUITest class:

let app = XCUIApplication()
app.buttons["Login"].tap()

What error will occur if the "Login" button is not present in the UI?

A Timeout error waiting for element

B Runtime error: Element not found exception

C No error, test passes

D Compilation error: Missing import

💡 Hint

XCUITest waits for elements before interacting.

If the element is missing, XCUITest waits until timeout and then throws a timeout error.

❓ navigation

advanced

How to navigate to a new screen in XCUITest?

Which code snippet correctly taps a button to navigate to a new screen and verifies the new screen's label exists?

iOS Swift

let app = XCUIApplication()
app.launch()

// Navigate to new screen
app.buttons["Next"].tap()

// Verify new screen label
let label = app.staticTexts["Welcome"]
let exists = label.waitForExistence(timeout: 5)

A Does not tap button, only checks label existence, returns false

B Taps "Next" button but does not wait for label, returns false

C Taps "Next" button and waits for "Welcome" label to appear, returns true if found

D Taps "Next" button and immediately asserts label without waiting, may fail

💡 Hint

Waiting for elements after navigation is important.

Waiting for the label ensures the new screen loaded before asserting its presence.

🔧 Debug

expert

Why does this XCUITest fail intermittently?

This test sometimes fails with a timeout error:

let app = XCUIApplication()
app.launch()
app.buttons["Load Data"].tap()
let table = app.tables["DataTable"]
XCTAssertTrue(table.exists)

What is the most likely cause?

A The button identifier "Load Data" is incorrect

B XCTAssertTrue is used incorrectly

C The app.launch() call is missing

D The table may not be loaded immediately after tapping, causing the assertion to run too soon

💡 Hint

Consider asynchronous UI updates after tapping buttons.

The test does not wait for the table to appear after tapping, so the assertion may run before the UI updates.