AAA + TestingRobot + Kotlin DSL

ActRobot.kt

package com.tapura.podmorecasts

import android.support.test.espresso.Espresso.onView
import android.support.test.espresso.action.ViewActions.pressImeActionButton
import android.support.test.espresso.matcher.ViewMatchers.withId

class ActRobot {
    fun clickOkInSearchBar() {
        onView(withId(android.support.design.R.id.search_src_text)).perform().perform(pressImeActionButton())
    }

    fun wait01(i: Long) {
        Thread.sleep(i)
    }
}

inline fun action(block: ActRobot.() -> Unit)= ActRobot().apply(block)

AndroidKotlinTest.kt

package com.tapura.podmorecasts

import android.support.test.rule.ActivityTestRule
import android.support.test.runner.AndroidJUnit4
import org.junit.Rule
import org.junit.Test
import org.junit.runner.RunWith

@RunWith(AndroidJUnit4::class)
class AndroidKotlinTest {

    @get:Rule
    var rule = ActivityTestRule(SplashActivity::class.java)

    @Test
    @Throws(InterruptedException::class)
    fun whenSearching_shouldShowResultsCorrectlyTestRobot() {
        arrange {
            clickInSearchBar()
            typeInSearchBar("Nerdcast")
        }

        action {
            clickOkInSearchBar()
            wait01(3000L)
        }

        assert {
            assertListGreaterThan(0)
        }
    }

    @Test
    @Throws(InterruptedException::class)
    fun whenSearching_shouldShowResultsCorrectlyTestRobotJake() {
        mainScreen {
            clickInSearchBox()
            typeInSearchBox("Nerdcast")
            clickOkInSearchBox()
            wait(3000)
        }

        SearchableListScreenRobot()
                .assertListGreaterThan(0)
    }
}

inline fun mainScreen(block: MainScreenRobot.() -> Unit) = MainScreenRobot().apply(block)

ArrangeRobot.kt

package com.tapura.podmorecasts

import android.support.test.espresso.Espresso.onView
import android.support.test.espresso.action.ViewActions.click
import android.support.test.espresso.action.ViewActions.typeText
import android.support.test.espresso.matcher.ViewMatchers.withId

class ArrangeRobot {
    fun clickInSearchBar() {
        onView(withId(R.id.action_search)).perform(click())
    }

    fun typeInSearchBar(text: String) {
        onView(withId(android.support.design.R.id.search_src_text)).perform(typeText(text))
    }
}

inline fun arrange(block: ArrangeRobot.() -> Unit) = ArrangeRobot().apply(block)

AssertRobot.kt

package com.tapura.podmorecasts

import android.support.test.espresso.Espresso.onView
import android.support.test.espresso.matcher.ViewMatchers.withId
import org.hamcrest.Matchers.greaterThan

class AssertRobot {
    fun assertListGreaterThan(i: Int) {
        onView(withId(R.id.recycler_view_podcasts_discover_list)).check(RecyclerViewItemCountAssertion(greaterThan<Int>(0)))

    }
}
inline fun assert(block: AssertRobot.() -> Unit)= AssertRobot().apply(block)

ExampleInstrumentedTest.java

package com.tapura.podmorecasts;

import android.content.Context;
import android.support.test.InstrumentationRegistry;
import android.support.test.rule.ActivityTestRule;
import android.support.test.runner.AndroidJUnit4;

import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.RunWith;

import static android.support.test.espresso.Espresso.onView;
import static android.support.test.espresso.action.ViewActions.click;
import static android.support.test.espresso.action.ViewActions.pressImeActionButton;
import static android.support.test.espresso.action.ViewActions.typeText;
import static android.support.test.espresso.matcher.ViewMatchers.withId;
import static org.hamcrest.Matchers.greaterThan;
import static org.junit.Assert.assertEquals;

/**
 * Instrumented test, which will execute on an Android device.
 *
 * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
 */
@RunWith(AndroidJUnit4.class)
public class ExampleInstrumentedTest {

    @Rule
    public ActivityTestRule<SplashActivity> rule = new ActivityTestRule<>(SplashActivity.class);

    @Test
    public void useAppContext() throws Exception {
        // Context of the app under test.
        Context appContext = InstrumentationRegistry.getTargetContext();

        assertEquals("com.tapura.podmorecasts", appContext.getPackageName());
    }

    @Test
    public void whenSearching_shouldShowResultsCorrectly() throws InterruptedException {
        // Arrange
        onView(withId(R.id.action_search)).perform(click());
        onView(withId(android.support.design.R.id.search_src_text)).perform(typeText("Nerdcast"));

        //Action
        onView(withId(android.support.design.R.id.search_src_text)).perform().perform(pressImeActionButton());
        Thread.sleep(3000);

        //Assert
        onView(withId(R.id.recycler_view_podcasts_discover_list)).check(new RecyclerViewItemCountAssertion(greaterThan(0)));
    }

    @Test
    public void whenSearching_shouldShowResultsCorrectlyTestRobot() throws InterruptedException {
        new MainScreenRobot()
                .clickInSearchBox()
                .typeInSearchBox("Nerdcast")
                .clickOkInSearchBox()
                .wait(3000);

        new SearchableListScrfeenRobot()
                .assertListGreaterThan(0);
    }
}

MainScreenRobot.java

package com.tapura.podmorecasts;

import static android.support.test.espresso.Espresso.onView;
import static android.support.test.espresso.action.ViewActions.click;
import static android.support.test.espresso.action.ViewActions.pressImeActionButton;
import static android.support.test.espresso.action.ViewActions.typeText;
import static android.support.test.espresso.matcher.ViewMatchers.withId;

public class MainScreenRobot {
    public MainScreenRobot clickInSearchBox() {
        onView(withId(R.id.action_search)).perform(click());
        return this;
    }

    public MainScreenRobot typeInSearchBox(String text) {
        onView(withId(android.support.design.R.id.search_src_text)).perform(typeText(text));

        return this;
    }

    public MainScreenRobot clickOkInSearchBox() {
        onView(withId(android.support.design.R.id.search_src_text)).perform().perform(pressImeActionButton());

        return this;
    }

    public MainScreenRobot wait(int i) {
        try {
            Thread.sleep(i);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        return this;
    }
}

RecyclerViewItemCountAssertion.java

package com.tapura.podmorecasts;

import android.support.test.espresso.NoMatchingViewException;
import android.support.test.espresso.ViewAssertion;
import android.support.v7.widget.RecyclerView;
import android.view.View;

import org.hamcrest.Matcher;

import static android.support.test.espresso.matcher.ViewMatchers.assertThat;
import static org.hamcrest.Matchers.is;

public class RecyclerViewItemCountAssertion implements ViewAssertion {

    private final Matcher<Integer> matcher;

    public RecyclerViewItemCountAssertion(int expectedCount) {
        this.matcher = is(expectedCount);
    }

    public RecyclerViewItemCountAssertion(Matcher<Integer> matcher) {
        this.matcher = matcher;
    }

    @Override
    public void check(View view, NoMatchingViewException noViewFoundException) {
        if (noViewFoundException != null) {
            throw noViewFoundException;
        }

        RecyclerView recyclerView = (RecyclerView) view;
        RecyclerView.Adapter adapter = recyclerView.getAdapter();
        assertThat(adapter.getItemCount(), matcher);
    }

}

SearchableListScreenRobot.kt

package com.tapura.podmorecasts;

import static android.support.test.espresso.Espresso.onView;
import static android.support.test.espresso.matcher.ViewMatchers.withId;
import static org.hamcrest.Matchers.greaterThan;

public class SearchableListScreenRobot {
    public SearchableListScreenRobot assertListGreaterThan(int i) {
        onView(withId(R.id.recycler_view_podcasts_discover_list)).check(new RecyclerViewItemCountAssertion(greaterThan(i)));

        return this;
    }
}