Tell about your experience creating automated tests and test scenarios.

In my experience creating automated tests for Android applications, I used tools such as JUnit for unit testing and Espresso for UI testing. Test scenarios were usually built based on requirements and user stories to cover main functional cases and boundary conditions.

For example, to verify the correct operation of the login form, I wrote a test that entered valid and invalid data, checked error displays, and successful navigation to the next screen.

@Test
fun testLoginForm() {
    onView(withId(R.id.username)).perform(typeText("user"))
    onView(withId(R.id.password)).perform(typeText("password"))
    onView(withId(R.id.login_button)).perform(click())
    onView(withId(R.id.welcome_message)).check(matches(isDisplayed()))
}

This approach allows for quick regression detection and increases the reliability of the application.