Added some small UI Tests

app/build.gradle

@@ -77,7 +77,14 @@ dependencies {
     testImplementation 'org.mockito:mockito-core:2.28.2'
     //Espresso
     androidTestImplementation 'androidx.test.ext:junit:1.1.2'
-    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
+    androidTestImplementation 'androidx.test:runner:1.3.0'
+    androidTestImplementation 'androidx.test:core:1.3.0'
+     androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
+    debugImplementation "androidx.fragment:fragment-testing:$fragment_version"
+    androidTestImplementation "androidx.test.espresso:espresso-contrib:3.3.0"
+    implementation "androidx.test.espresso:espresso-idling-resource:3.3.0"
+
+    //Components from androidx.arch for unit tests
     implementation 'com.google.code.gson:gson:2.8.6'
     //Mockito Kotlin
     testImplementation "com.nhaarman.mockitokotlin2:mockito-kotlin:2.2.0"

app/src/androidTest/java/com/noumanch/decadeofmovies/ui/activities/MainActivityUITest.kt

@@ -0,0 +1,21 @@
+package com.noumanch.decadeofmovies.ui.activities
+
+import androidx.test.core.app.ActivityScenario
+import androidx.test.internal.runner.junit4.AndroidJUnit4ClassRunner
+import org.junit.Test
+import org.junit.runner.RunWith
+import androidx.test.espresso.Espresso.onView
+import androidx.test.espresso.assertion.ViewAssertions.matches
+import androidx.test.espresso.matcher.ViewMatchers.isDisplayed
+import androidx.test.espresso.matcher.ViewMatchers.withId
+import com.noumanch.decadeofmovies.R
+
+@RunWith(AndroidJUnit4ClassRunner::class)
+class MainActivityUITest{
+
+    @Test
+    fun test_isActivityInView(){
+        val activityScenario = ActivityScenario.launch(MainActivity::class.java)
+        onView(withId(R.id.main)).check(matches(isDisplayed()))
+    }
+}

app/src/androidTest/java/com/noumanch/decadeofmovies/ui/fragments/MoviesFragmentTest.kt

@@ -0,0 +1,60 @@
+package com.noumanch.decadeofmovies.ui.fragments
+
+import androidx.test.espresso.Espresso.onView
+import androidx.test.espresso.Espresso.pressBack
+import androidx.test.espresso.action.ViewActions.click
+import androidx.test.espresso.assertion.ViewAssertions.matches
+import androidx.test.espresso.contrib.RecyclerViewActions.actionOnItemAtPosition
+import androidx.test.espresso.matcher.ViewMatchers.*
+import androidx.test.ext.junit.rules.ActivityScenarioRule
+import androidx.test.internal.runner.junit4.AndroidJUnit4ClassRunner
+import com.noumanch.decadeofmovies.R
+import com.noumanch.decadeofmovies.ui.activities.MainActivity
+import com.noumanch.decadeofmovies.utils.FakeMovieData
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+
+
+@RunWith(AndroidJUnit4ClassRunner::class)
+class MoviesFragmentTest {
+
+    @get:Rule
+    val activityRule = ActivityScenarioRule(MainActivity::class.java)
+
+    val LIST_ITEM_IN_TEST = 9
+    val MOVIE_IN_TEST = FakeMovieData.movies[LIST_ITEM_IN_TEST]
+
+
+    @Test
+    fun test_isListFragmentVisible_onAppLaunch() {
+        onView(withId(R.id.recyclerView)).check(matches(isDisplayed()))
+    }
+
+    @Test
+    fun test_selectListItem_isDetailFragmentVisible() {
+        // Click list item #LIST_ITEM_IN_TEST
+        onView(withId(R.id.recyclerView))
+            .perform(actionOnItemAtPosition<MoviesAdapter.MovieViewHolder>(LIST_ITEM_IN_TEST, click()))
+
+        // Confirm nav to MovieDetailFragment and display title
+        onView(withId(R.id.movieTitleTV)).check(matches(withText(MOVIE_IN_TEST.title)))
+    }
+
+    @Test
+    fun test_backNavigation_toMovieListFragment() {
+        // Click list item #LIST_ITEM_IN_TEST
+        onView(withId(R.id.recyclerView))
+            .perform(actionOnItemAtPosition<MoviesAdapter.MovieViewHolder>(LIST_ITEM_IN_TEST, click()))
+
+        // Confirm nav to MovieDetailFragment and display title
+        onView(withId(R.id.movieTitleTV)).check(matches(withText(MOVIE_IN_TEST.title)))
+
+        pressBack()
+
+        // Confirm MoviesFragment in view
+        onView(withId(R.id.recyclerView)).check(matches(isDisplayed()))
+    }
+}
+
+

app/src/androidTest/java/com/noumanch/decadeofmovies/utils/FakeMovieData.kt

@@ -0,0 +1,99 @@
+package com.noumanch.decadeofmovies.utils
+
+import com.noumanch.decadeofmovies.models.Movie
+
+object FakeMovieData {
+
+    val movies = arrayOf(
+        Movie(
+            0,
+            "Avengers: Infinity War",
+            2012,2,
+            arrayListOf("Anthony Russo", "Joe Russo"),
+            arrayListOf("Robert Downey Jr.", "Chris Hemsworth", "Mark Ruffalo", "+ more...")
+        ),
+        Movie(
+            1,
+            "The Rundown",
+            2012,2,
+            arrayListOf("R.J. Stewart", "James Vanderbilt"),
+            arrayListOf("Dwayne Johnson", "Seann William Scott", "Rosario Dawson", "Christopher Walken")
+        ),
+        Movie(
+            2,
+            "The Godfather",
+            2012,2,
+            arrayListOf("Francis Ford Coppola"),
+            arrayListOf("Marlon Brando", "Al Pacino", "James Caan")
+        ),
+        Movie(
+            3,
+            "The Dark Knight",
+            2012,2,
+            arrayListOf("Christopher Nolan"),
+            arrayListOf("Christian Bale", "Heath Ledger", "Aaron Eckhart")
+        ),
+        Movie(
+            4,
+            "The Lord of the Rings: The Return of the King",
+            2012,2,
+            arrayListOf("Peter Jackson"),
+            arrayListOf("Elijah Wood", "Viggo Mortensen", "Ian McKellen")
+        ),
+        Movie(
+            3,
+            "The Dark Knight",
+            2012,2,
+            arrayListOf("Christopher Nolan"),
+            arrayListOf("Christian Bale", "Heath Ledger", "Aaron Eckhart")
+        ),
+        Movie(
+            4,
+            "The Lord of the Rings: The Return of the King",
+            2012,2,
+            arrayListOf("Peter Jackson"),
+            arrayListOf("Elijah Wood", "Viggo Mortensen", "Ian McKellen")
+        ),
+    Movie(
+            5,
+            "The Dark Knight",
+            2012,2,
+            arrayListOf("Christopher Nolan"),
+            arrayListOf("Christian Bale", "Heath Ledger", "Aaron Eckhart")
+        ),
+        Movie(
+            6,
+            "The Lord of the Rings: The Return of the King",
+            2012,2,
+            arrayListOf("Peter Jackson"),
+            arrayListOf("Elijah Wood", "Viggo Mortensen", "Ian McKellen")
+        ),
+    Movie(
+            7,
+            "The Dark Knight",
+            2012,2,
+            arrayListOf("Christopher Nolan"),
+            arrayListOf("Christian Bale", "Heath Ledger", "Aaron Eckhart")
+        ),
+        Movie(
+            8,
+            "The Lord of the Rings: The Return of the King",
+            2012,2,
+            arrayListOf("Peter Jackson"),
+            arrayListOf("Elijah Wood", "Viggo Mortensen", "Ian McKellen")
+        ),  Movie(
+            9,
+            "The Dark Knight",
+            2012,2,
+            arrayListOf("Christopher Nolan"),
+            arrayListOf("Christian Bale", "Heath Ledger", "Aaron Eckhart")
+        ),
+        Movie(
+            10,
+            "The Lord of the Rings: The Return of the King",
+            2012,2,
+            arrayListOf("Peter Jackson"),
+            arrayListOf("Elijah Wood", "Viggo Mortensen", "Ian McKellen")
+        )
+    )
+}

app/src/main/java/com/noumanch/decadeofmovies/ui/fragments/MoviesFragment.kt

@@ -9,6 +9,7 @@ import androidx.fragment.app.Fragment
 import androidx.navigation.fragment.findNavController
 import com.noumanch.decadeofmovies.R
 import com.noumanch.decadeofmovies.databinding.FragmentMoviesBinding
+import com.noumanch.decadeofmovies.utils.EspressoIdlingResource
 import com.noumanch.decadeofmovies.utils.extensions.hide
 import com.noumanch.decadeofmovies.utils.extensions.show
 import com.noumanch.decadeofmovies.utils.showAlertDialog
@@ -56,6 +57,7 @@ class MoviesFragment : Fragment() {
                 MoviesViewModel.GetMoviesViewState.Loading -> binding.progressBar.show()
                 is MoviesViewModel.GetMoviesViewState.Success -> {
                     binding.progressBar.hide()
+                    EspressoIdlingResource.decrement()
                     if (viewState.movies.size > 0) {
                         binding.apply {
                             recyclerView.show()
@@ -110,6 +112,7 @@ class MoviesFragment : Fragment() {
             }
         }
         //load data
+        EspressoIdlingResource.increment()
         moviesViewModel.getMovies()
     }
 

app/src/main/java/com/noumanch/decadeofmovies/utils/EspressoIdlingResource.kt

@@ -0,0 +1,20 @@
+package com.noumanch.decadeofmovies.utils
+
+import androidx.test.espresso.idling.CountingIdlingResource
+
+object EspressoIdlingResource {
+
+    private const val RESOURCE = "GLOBAL"
+
+    @JvmField val countingIdlingResource = CountingIdlingResource(RESOURCE)
+
+    fun increment() {
+        countingIdlingResource.increment()
+    }
+
+    fun decrement() {
+        if (!countingIdlingResource.isIdleNow) {
+            countingIdlingResource.decrement()
+        }
+    }
+}

app/src/main/res/layout/activity_main.xml

@@ -4,6 +4,7 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="vertical"
+    android:id="@+id/main"
     android:background="?android:attr/colorBackground"
     >
 

build.gradle

@@ -4,6 +4,7 @@ buildscript {
     ext.navigationVersion = "2.3.3"
     ext.retrofit_version = "2.9.0"
     ext.room_version = "2.3.0"
+    ext.fragment_version = "1.3.4"
 
     repositories {
         google()