ExampleUnitTest.kt

// app/src/test/(java|kotlin))/(package名)/ExampleUnitTest.kt

@RunWith(AndroidJUnit4::class)
class ExampleUnitTest {
    @Test
    fun useAppContext() {
        val context = InstrumentationRegistry.getTargetContext()
        val sp = context.getSharedPreferences("hoge", Context.MODE_PRIVATE)
        sp.edit().putBoolean("hoge", true).apply()
        assertTrue(sp.getBoolean("hoge", false))
    }
}