basic espresso testSanity() working locally and on was device farm

android/java/MapboxGLAndroidSDKTestApp/src/androidTest/java/com/mapbox/mapboxgl/testapp/BaseTest.java

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+package com.mapbox.mapboxgl.testapp;
+
+import android.support.test.InstrumentationRegistry;
+import android.test.ActivityInstrumentationTestCase2;
+
+import org.junit.Before;
+
+/**
+ * Base Espresso class for all tests, helps working with ActivityInstrumentationTestCase2
+ */
+public class BaseTest
+        extends ActivityInstrumentationTestCase2<MainActivity> {
+
+    private MainActivity mActivity;
+
+    public BaseTest() {
+        super(MainActivity.class);
+    }
+
+    @Before
+    public void setUp() throws Exception {
+        super.setUp();
+        injectInstrumentation(InstrumentationRegistry.getInstrumentation());
+        mActivity = getActivity();
+    }
+
+}

android/java/MapboxGLAndroidSDKTestApp/src/androidTest/java/com/mapbox/mapboxgl/testapp/MainActivityTest.java

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+package com.mapbox.mapboxgl.testapp;
+
+import org.junit.Test;
+
+import static android.support.test.espresso.Espresso.onView;
+import static android.support.test.espresso.assertion.ViewAssertions.matches;
+import static android.support.test.espresso.matcher.ViewMatchers.isDisplayed;
+import static android.support.test.espresso.matcher.ViewMatchers.withId;
+
+/**
+ * Tests MainActivity
+ */
+public class MainActivityTest extends BaseTest {
+
+    /*
+     * Note that we need to keep the `test` prefix if we want to be able to run these
+     * tests on AWS Device Farm, annotations are not enough:
+     * https://github.com/awslabs/aws-device-farm-sample-app-for-android/issues/5#issuecomment-138258444
+     */
+
+    @Test
+    public void testSanity() {
+        onView(withId(R.id.layout_map))
+                .check(matches(isDisplayed()));
+    }
+
+}