First working unit test

app/build.gradle

@@ -15,6 +15,7 @@ android {
         versionName "1.0"
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+//        testInstrumentationRunner "com.google.android.apps.common.testing.testrunner.GoogleInstrumentationTestRunner"
     }
 
     buildTypes {
@@ -36,7 +37,6 @@ android {
 }
 
 dependencies {
-
     implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
     implementation 'androidx.core:core-ktx:1.6.0'
     implementation 'androidx.appcompat:appcompat:1.3.1'

app/src/androidTest/java/it/danieleverducci/subitobeers/ExampleInstrumentedTest.kt

@@ -1,24 +0,0 @@
-package it.danieleverducci.subitobeers
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("it.danieleverducci.subitobeers", appContext.packageName)
-    }
-}

app/src/androidTest/java/it/danieleverducci/subitobeers/ui/BeersFragmentTest.kt

@@ -0,0 +1,38 @@
+package it.danieleverducci.subitobeers.ui
+
+import androidx.test.espresso.Espresso
+import androidx.test.espresso.action.ViewActions
+import androidx.test.espresso.assertion.ViewAssertions
+import androidx.test.espresso.matcher.ViewMatchers
+import androidx.test.ext.junit.rules.ActivityScenarioRule
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.filters.LargeTest
+import it.danieleverducci.subitobeers.MainActivity
+import it.danieleverducci.subitobeers.R
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+@LargeTest
+class BeersFragmentTest {
+
+    @get:Rule
+    var activityRule: ActivityScenarioRule<MainActivity>
+            = ActivityScenarioRule(MainActivity::class.java)
+
+    @Test
+    fun filter_BeersFragmentTest() {
+        // Filters for the current date as brewed start date (we expect 0 results)
+        // Click menu item
+        Espresso.onView(ViewMatchers.withId(R.id.action_filter)).perform(ViewActions.click())
+        // Click filter button
+        Espresso.onView(ViewMatchers.withId(R.id.list_filter_since_bt)).perform(ViewActions.click())
+        // Click ok on datepicker
+        Espresso.onView(ViewMatchers.withText("OK")).perform(ViewActions.click())
+        Thread.sleep(500)
+        // Check the list empty message is correctly displayed
+        Espresso.onView(ViewMatchers.withId(R.id.list_empty))
+            .check(ViewAssertions.matches(ViewMatchers.isDisplayed()))
+    }
+}

app/src/test/java/it/danieleverducci/subitobeers/ExampleUnitTest.kt

@@ -1,17 +0,0 @@
-package it.danieleverducci.subitobeers
-
-import org.junit.Test
-
-import org.junit.Assert.*
-
-/**
- * Example local unit test, which will execute on the development machine (host).
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-class ExampleUnitTest {
-    @Test
-    fun addition_isCorrect() {
-        assertEquals(4, 2 + 2)
-    }
-}