Add Android e2e test module

The purpose of this test module is to be able to trigger end-to-end
tests separately from the main app module, mainly because of the flaky
nature of end-to-end tests.

Tests are easiest executed by running the following gradle command:
./gradlew :e2e:connectedDebugAndroidTest

9 files changed, 98 insertions, 0 deletions

diff --git a/android/buildSrc/src/main/kotlin/Dependencies.kt b/android/buildSrc/src/main/kotlin/Dependencies.kt
index e4d78ecd73..97ff89bab8 100644
--- a/android/buildSrc/src/main/kotlin/Dependencies.kt
+++ b/android/buildSrc/src/main/kotlin/Dependencies.kt
@@ -27,6 +27,14 @@ object Dependencies {
             "androidx.test.espresso:espresso-core:${Versions.AndroidX.espresso}"
         const val espressoContrib =
             "androidx.test.espresso:espresso-contrib:${Versions.AndroidX.espresso}"
+        const val testCore =
+            "androidx.test:core:${Versions.AndroidX.test}"
+        const val testRunner =
+            "androidx.test:runner:${Versions.AndroidX.test}"
+        const val testUiAutomator =
+            "androidx.test.uiautomator:uiautomator:${Versions.AndroidX.uiautomator}"
+        const val testOrchestrator =
+            "androidx.test:orchestrator:${Versions.AndroidX.test}"
     }
 
     object Koin {
@@ -59,6 +67,7 @@ object Dependencies {
     object Plugin {
         const val android = "com.android.tools.build:gradle:${Versions.Plugin.android}"
         const val androidApplicationId = "com.android.application"
+        const val androidTestId = "com.android.test"
         const val playPublisher =
             "com.github.triplet.gradle:play-publisher:${Versions.Plugin.playPublisher}"
         const val playPublisherId = "com.github.triplet.play"
diff --git a/android/buildSrc/src/main/kotlin/Versions.kt b/android/buildSrc/src/main/kotlin/Versions.kt
index 8db39a305f..d5c3563202 100644
--- a/android/buildSrc/src/main/kotlin/Versions.kt
+++ b/android/buildSrc/src/main/kotlin/Versions.kt
@@ -27,6 +27,8 @@ object Versions {
         const val fragment = "1.3.2"
         const val recyclerview = "1.2.1"
         const val junit = "1.1.3"
+        const val test = "1.4.0"
+        const val uiautomator = "2.2.0"
     }
 
     object Plugin {
diff --git a/android/e2e/build.gradle.kts b/android/e2e/build.gradle.kts
new file mode 100644
index 0000000000..655855c1f4
--- /dev/null
+++ b/android/e2e/build.gradle.kts
@@ -0,0 +1,34 @@
+plugins {
+    id(Dependencies.Plugin.androidTestId)
+    id(Dependencies.Plugin.kotlinAndroidId)
+}
+
+android {
+    compileSdkVersion(Versions.Android.compileSdkVersion)
+
+    defaultConfig {
+        minSdkVersion(Versions.Android.minSdkVersion)
+        targetSdkVersion(Versions.Android.targetSdkVersion)
+        testApplicationId = "net.mullvad.mullvadvpn.e2e"
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    testOptions {
+        execution = "ANDROIDX_TEST_ORCHESTRATOR"
+    }
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_1_8
+        targetCompatibility = JavaVersion.VERSION_1_8
+    }
+
+    targetProjectPath = ":app"
+}
+
+dependencies {
+    implementation(Dependencies.AndroidX.testCore)
+    implementation(Dependencies.AndroidX.testOrchestrator)
+    implementation(Dependencies.AndroidX.testRunner)
+    implementation(Dependencies.AndroidX.testUiAutomator)
+    implementation(Dependencies.Kotlin.stdlib)
+}
diff --git a/android/e2e/src/main/AndroidManifest.xml b/android/e2e/src/main/AndroidManifest.xml
new file mode 100644
index 0000000000..50c48f741b
--- /dev/null
+++ b/android/e2e/src/main/AndroidManifest.xml
@@ -0,0 +1,6 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="net.mullvad.mullvadvpn.e2e">
+    <uses-permission android:name="android.permission.INTERNET" />
+    <instrumentation android:name="androidx.test.runner.AndroidJUnitRunner"
+        android:targetPackage="net.mullvad.mullvadvpn" />
+</manifest>
diff --git a/android/e2e/src/main/java/net/mullvad/mullvadvpn/e2e/LaunchAppTest.kt b/android/e2e/src/main/java/net/mullvad/mullvadvpn/e2e/LaunchAppTest.kt
new file mode 100644
index 0000000000..5d19716ff5
--- /dev/null
+++ b/android/e2e/src/main/java/net/mullvad/mullvadvpn/e2e/LaunchAppTest.kt
@@ -0,0 +1,37 @@
+package net.mullvad.mullvadvpn.e2e
+
+import android.content.Intent
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.runner.AndroidJUnit4
+import androidx.test.uiautomator.By
+import androidx.test.uiautomator.UiDevice
+import androidx.test.uiautomator.Until
+import net.mullvad.mullvadvpn.e2e.constant.APP_LAUNCH_TIMEOUT
+import net.mullvad.mullvadvpn.e2e.constant.MULLVAD_PACKAGE
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class LaunchAppTest {
+    @Test
+    fun testLaunchApp() {
+        val device = UiDevice.getInstance(InstrumentationRegistry.getInstrumentation())
+        val targetContext = InstrumentationRegistry.getInstrumentation().targetContext
+        device.pressHome()
+        // Wait for launcher
+        device.wait(
+            Until.hasObject(By.pkg(device.launcherPackageName).depth(0)),
+            APP_LAUNCH_TIMEOUT
+        )
+        val intent =
+            targetContext.packageManager.getLaunchIntentForPackage(MULLVAD_PACKAGE)?.apply {
+                // Clear out any previous instances
+                addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK)
+            }
+        targetContext.startActivity(intent)
+        device.wait(
+            Until.hasObject(By.pkg(MULLVAD_PACKAGE).depth(0)),
+            APP_LAUNCH_TIMEOUT
+        )
+    }
+}
diff --git a/android/e2e/src/main/java/net/mullvad/mullvadvpn/e2e/constant/Constants.kt b/android/e2e/src/main/java/net/mullvad/mullvadvpn/e2e/constant/Constants.kt
new file mode 100644
index 0000000000..44b8029799
--- /dev/null
+++ b/android/e2e/src/main/java/net/mullvad/mullvadvpn/e2e/constant/Constants.kt
@@ -0,0 +1,3 @@
+package net.mullvad.mullvadvpn.e2e.constant
+
+const val LOG_TAG = "mullvad-e2e"
diff --git a/android/e2e/src/main/java/net/mullvad/mullvadvpn/e2e/constant/PackageConstants.kt b/android/e2e/src/main/java/net/mullvad/mullvadvpn/e2e/constant/PackageConstants.kt
new file mode 100644
index 0000000000..47aeaa0237
--- /dev/null
+++ b/android/e2e/src/main/java/net/mullvad/mullvadvpn/e2e/constant/PackageConstants.kt
@@ -0,0 +1,3 @@
+package net.mullvad.mullvadvpn.e2e.constant
+
+const val MULLVAD_PACKAGE = "net.mullvad.mullvadvpn"
diff --git a/android/e2e/src/main/java/net/mullvad/mullvadvpn/e2e/constant/TimeoutConstants.kt b/android/e2e/src/main/java/net/mullvad/mullvadvpn/e2e/constant/TimeoutConstants.kt
new file mode 100644
index 0000000000..6ede2d3048
--- /dev/null
+++ b/android/e2e/src/main/java/net/mullvad/mullvadvpn/e2e/constant/TimeoutConstants.kt
@@ -0,0 +1,3 @@
+package net.mullvad.mullvadvpn.e2e.constant
+
+const val APP_LAUNCH_TIMEOUT = 5000L
diff --git a/android/settings.gradle.kts b/android/settings.gradle.kts
index 15a801b10a..cc8e04d837 100644
--- a/android/settings.gradle.kts
+++ b/android/settings.gradle.kts
@@ -1 +1,2 @@
 include(":app")
+include(":e2e")