Swift Quality Control & Assurance 3

Question 1

What type of testing validates that different modules or services in a Swift app work correctly together?

Accepted Answer

Integration testing

Answer

Integration testing validates the interaction between multiple components, modules, or services rather than testing them in isolation.

Question 2

In Swift UI testing with XCTest, which class is used to represent and interact with the running application?

Accepted Answer

XCUIApplication

Answer

XCUIApplication represents the app under test and provides methods to launch, terminate, and interact with it during UI tests.

Question 3

What is a 'mock object' used for in Swift unit testing?

Accepted Answer

To replace a real dependency with a controlled substitute

Answer

Mock objects replace real dependencies with controlled substitutes so tests can verify interactions without relying on external systems.

Question 4

Which Xcode feature visually highlights which lines of code are covered or missed by your tests?

Accepted Answer

Code coverage gutters in the source editor

Answer

Xcode's code coverage gutters display colored indicators next to each line showing whether it was executed during test runs.

Question 5

What does 'flaky test' mean in Swift quality assurance?

Accepted Answer

A test that passes and fails intermittently without code changes

Answer

A flaky test is one that produces inconsistent results — sometimes passing, sometimes failing — without any changes to the underlying code.

Swift Practice Test