fo2rist

@RunWith(AndroidJUnit4::class)
class BaseMainActivityTest {

    @get:Rule
    var activityRule = ActivityTestRule(MainActivity::class.java)

    protected val context: Context by lazy { activityRule.activity }
    
    // test goes here just like this example from Espresso documentation
}

fo2rist

@RunWith(AndroidJUnit4::class)
class BaseMainActivityTest {

    @get:Rule
    var activityRule = ActivityTestRule(MainActivity::class.java)
    
    @Test
    fun acitivityIsRunning() {
        if (true) while(true) Thread.sleep(100); /*DEBUG*/
    }

fo2rist

@RunWith(AndroidJUnit4::class)
class BaseMainActivityTest {

    @get:Rule
    var activityRule = ActivityTestRule(MainActivity::class.java)

    // the context is often needed in more complex Espresso tests
    protected val context: Context by lazy { activityRule.activity }
    
    @Test

fo2rist

// try-fail-catch approach
try {
  doMainAction()
} catch (exc: SomePreconditionViolated) {
  doFallbackAction()
}

                     /* ^ COMPARE v */

// check-and-execute approach

fo2rist

// try-ignore approach
try {
  doAction()
} catch (exc: SomePreconditionViolated) {
  //ignore
} finally {
  finalize()
}

                     /* ^ COMPARE v */

fo2rist

class SomeStrictActivity : Activity() {
    companion object {
        @JvmStatic
        fun createIntent(context: Context, importantParameter: Parameter): Intent {
            val intent = Intent(context, SomeStrictActivity::class.java)
            intent.putExtra(EXTRA_PARAMETER, importantParameter)
            return intent
        }
    }

fo2rist

data class SomeData(
    val intValue: Int,
    val strValue: String = "default value"
)

fo2rist

data class SomeData(
    val intValue: Int = 0,
    val strValue: String = "default value"
)

fo2rist

data class WithoutDefaultConstructor(
    val intValue: Int,
    val strValue: String = "default"
)

data class WithDefaultConstructor(
    val intValue: Int = 1,
    val strValue: String = "default"
)

fo2rist

public final class WithoutDefaultConstructor {
   private final int intValue;
   @NotNull
   private final String strValue;

   public WithoutDefaultConstructor(int intValue, @NotNull String strValue) {
      super();
      this.intValue = intValue;
      this.strValue = strValue;
   }