junit.framework.AssertionFailedError: expected:<DESTROYED> but was:<RESUMED>

I have an activity with a Button in it. On clicking the button, am calling finish(). The problem is, when I am writing an instrumentation test to check if the activity destroyed, I am getting

junit.framework.AssertionFailedError: expected:<DESTROYED> but was:<RESUMED>

My questions are

• Why the state is still RESUMED even after finish() got called?
• Isn't it the right method to check the activity state?

Here's my activity

MainActivity.kt

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        findViewById<Button>(R.id.b_kill_me).setOnClickListener {
            finish()
        }
    }
}

Here's my test

MainActivityTest.kt

class MainActivityTest {
    @Test
    fun killMe() {
        val mainActivity = ActivityScenario.launch(MainActivity::class.java)
        onView(withId(R.id.b_kill_me)).perform(click())
        assertEquals(Lifecycle.State.DESTROYED, mainActivity.state)
    }
}

Here's the complete source code : Google Drive Link