Question 1

What is JUnit?

Accepted Answer

JUnit is a unit testing framework for Java and Kotlin. It's the standard for writing and executing automated tests. JUnit 4 uses annotations (@Test, @Before, @After) to define tests and their lifecycle. JUnit tests are fast because they run on the local JVM without Android emulator.

Question 2

What is the @Test annotation used for?

Accepted Answer

@Test marks a method as a unit test. The method will be executed by the test runner. Without @Test, the method is ignored. Example: @Test fun testAddition() { assertEquals(4, 2 + 2) }. Each @Test must be independent and not depend on execution order.

Question 3

What is the @Before annotation used for?

Accepted Answer

@Before marks a method that executes BEFORE each test (@Test). Useful for initializing common objects, creating mocks, resetting state. Example: @Before fun setUp() { viewModel = MyViewModel() }. If you have 5 tests, @Before runs 5 times. Alternative: @BeforeClass for single execution before all tests.

Android Testing

What is JUnit?

Câu trả lời

What is the @Test annotation used for?

Câu trả lời

What is the @Before annotation used for?

Câu trả lời

What is the @After annotation used for?

What is an assertion in testing?

Các chủ đề phỏng vấn Android khác

Android Fundamentals

Android UI and Resources

Android Lifecycle

Android Navigation

Android Data Management

Android Networking

Android Gradle

Kotlin Language Essentials for Android

Room Database

Background Work

Jetpack Compose

Permissions and Device Features

Firebase for Android

Android MVVM Architecture

Advanced Android Networking

Kotlin Collections and Operators

Kotlin Coroutines and Flow

Android Dependency Injection

Android MVI Architecture

Android Clean Architecture

Android Compose Advanced

Android Performance and Monitoring

Android Security and Privacy

Android CI/CD and Release

Android UX and Form Factors

Android Testing Advanced

Nắm vững Android cho lần phỏng vấn tiếp theo