Add basic UI tests, testing drawer behavior

app/build.gradle

@@ -79,6 +79,22 @@ dependencies {
 
     implementation "com.crashlytics.sdk.android:crashlytics:${versions.crashlytics}"
     implementation "com.google.firebase:firebase-core:${versions.firebase}"
+
+    testImplementation project(':test_shared')
+    testImplementation "android.arch.core:core-testing:${versions.lifecycle}"
+    testImplementation "com.nhaarman:mockito-kotlin:${versions.mockito_kotlin}"
+    testImplementation "junit:junit:${versions.junit}"
+
+    androidTestImplementation project(':test_shared')
+    androidTestImplementation "android.arch.core:core-testing:${versions.lifecycle}"
+    androidTestImplementation "com.android.support.test:runner:${versions.test_runner}"
+    androidTestImplementation "com.android.support.test:rules:${versions.test_rules}"
+    androidTestImplementation "com.android.support.test.espresso:espresso-contrib:${versions.espresso}"
+    androidTestImplementation "com.android.support.test.espresso:espresso-core:${versions.espresso}"
+    androidTestImplementation "com.android.support.test.uiautomator:uiautomator-v18:${versions.ui_automator}"
+    androidTestImplementation "com.nhaarman:mockito-kotlin:${versions.mockito_kotlin}"
+    androidTestImplementation "org.mockito:mockito-android:${versions.mockito}"
+    androidTestImplementation "org.mockito:mockito-core:${versions.mockito}"
 }
 
 // Must be applied after dependencies. See https://stackoverflow.com/a/38018985

app/src/androidTest/java/io/plaidapp/ui/HomeActivityTest.kt

@@ -0,0 +1,73 @@
+/*
+ * Copyright 2018 Google, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.plaidapp.ui
+
+import android.support.test.InstrumentationRegistry
+import android.support.test.espresso.Espresso.onView
+import android.support.test.espresso.action.ViewActions.click
+import android.support.test.espresso.assertion.ViewAssertions.matches
+import android.support.test.espresso.contrib.DrawerMatchers.isClosed
+import android.support.test.espresso.contrib.DrawerMatchers.isOpen
+import android.support.test.espresso.matcher.ViewMatchers.withId
+import android.support.test.rule.ActivityTestRule
+import android.support.test.uiautomator.UiDevice
+import android.view.Gravity
+import io.plaidapp.R
+import org.junit.Rule
+import org.junit.Test
+
+class HomeActivityTest {
+
+    @Rule
+    @JvmField
+    var activityTestRule = ActivityTestRule(HomeActivity::class.java)
+
+    @Test
+    fun drawerClosedOnStartup() {
+        // Given that the app is not launched
+
+        // When the app is first launched
+
+        // Then the drawer should be closed
+        onView(withId(R.id.drawer)).check(matches(isClosed(Gravity.END)))
+    }
+
+    @Test
+    fun pressFilterButtonOpensDrawer() {
+        // Given that the drawer is closed
+        onView(withId(R.id.drawer)).check(matches(isClosed(Gravity.END)))
+
+        // When the filter button is pressed
+        onView(withId(R.id.menu_filter)).perform(click())
+
+        // Then the drawer should be opened
+        onView(withId(R.id.drawer)).check(matches(isOpen(Gravity.END)))
+    }
+
+    @Test
+    fun drawerStaysOpenAfterRotation() {
+        // Given that the drawer is open
+        onView(withId(R.id.menu_filter)).perform(click())
+        onView(withId(R.id.drawer)).check(matches(isOpen(Gravity.END)))
+
+        // When rotating the device
+        UiDevice.getInstance(InstrumentationRegistry.getInstrumentation()).setOrientationLeft()
+
+        // Then the drawer should stay open after rotation
+        onView(withId(R.id.drawer)).check(matches(isOpen(Gravity.END)))
+    }
+}

build.gradle

@@ -44,7 +44,8 @@ buildscript {
             'room'              : '1.1.1',
             'supportLibrary'    : '27.1.1',
             'test_rules'        : '1.0.2',
-            'test_runner'       : '1.0.2'
+            'test_runner'       : '1.0.2',
+            'ui_automator'      : '2.1.3'
     ]
     ext.names = [
             'applicationId': 'io.plaidapp'