Testing

// Example Unit Test
@Test
fun addition_isCorrect() {
    val calculator = Calculator()
    assertEquals(4, calculator.add(2, 2))
}

// Mocking Example
@Test
fun loadData_success() {
    val mockRepository = mock(Repository::class.java)
    `when`(mockRepository.getData()).thenReturn(Data("test"))
    
    val viewModel = MyViewModel(mockRepository)
    viewModel.loadData()
    
    assertEquals("test", viewModel.data.value)
}

// Espresso Test Example
@Test
fun login_success() {
    onView(withId(R.id.username))
        .perform(typeText("test@example.com"))
    
    onView(withId(R.id.password))
        .perform(typeText("password"))
    
    onView(withId(R.id.login_button))
        .perform(click())
    
    onView(withId(R.id.welcome_message))
        .check(matches(withText("Welcome!")))
}