[android] - fix dialog fragment setup, add regression test

platform/android/MapboxGLAndroidSDKTestApp/src/androidTest/java/com/mapbox/mapboxsdk/testapp/fragment/MapDialogFragmentTest.kt

@@ -0,0 +1,33 @@
+package com.mapbox.mapboxsdk.testapp.fragment
+
+import android.support.test.espresso.Espresso
+import android.support.test.espresso.Espresso.onView
+import android.support.test.espresso.action.ViewActions.click
+import android.support.test.espresso.matcher.ViewMatchers.withId
+import android.support.test.filters.LargeTest
+import android.support.test.rule.ActivityTestRule
+import android.support.test.runner.AndroidJUnit4
+import com.mapbox.mapboxsdk.testapp.R
+import com.mapbox.mapboxsdk.testapp.action.WaitAction
+import com.mapbox.mapboxsdk.testapp.activity.maplayout.MapInDialogActivity
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+
+/**
+ * Regression test that validates that a map inside a DialogFragment can be opened and closed.
+ */
+@RunWith(AndroidJUnit4::class)
+@LargeTest
+class MapDialogFragmentTest {
+
+    @get:Rule
+    var activityRule: ActivityTestRule<MapInDialogActivity> = ActivityTestRule(MapInDialogActivity::class.java)
+
+    @Test
+    fun openCloseDialog() {
+        onView(withId(R.id.button_open_dialog)).perform(click())
+        onView(withId(R.id.mapView)).perform(WaitAction(2500))
+        Espresso.pressBack()
+    }
+}