What types of automated tests do you know and can you apply?

Main types of automated tests in Android development:

• Unit tests — test individual methods and classes without dependence on the Android framework. Usually written using JUnit.
• Instrumented tests — run on a device or emulator, testing interaction with Android API, UI, and components.
• UI tests — automate the verification of the user interface, for example using Espresso.

Example of a simple unit test in Kotlin with JUnit:

@Test
fun addition_isCorrect() {
    assertEquals(4, 2 + 2)
}