Add android test orchestrator

Signed-off-by: Geoffrey Métais <geoffrey.metais@gmail.com>

build.gradle

@@ -31,6 +31,7 @@ ext {
     compileSdkVersion = 26
     junitVersion = '4.12'
     espressoVersion = '3.0.1'
+    supportTest = '1.0.2'
     minSdkVersion = 17
     targetSdkVersion = 26
     versionName = '3.0.13'

vlc-android/build.gradle

@@ -47,6 +47,10 @@ android {
         resValue "string", "build_vlc_revision", vlcRevision()
 
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+        // The following argument makes the Android Test Orchestrator run its
+        // "pm clear" command after each test invocation. This command ensures
+        // that the app's state is completely cleared between tests.
+        testInstrumentationRunnerArguments clearPackageData: 'true'
 
         minSdkVersion rootProject.ext.minSdkVersion
         targetSdkVersion rootProject.ext.targetSdkVersion
@@ -68,6 +72,10 @@ android {
         }
     }
 
+    testOptions {
+        execution 'ANDROID_TEST_ORCHESTRATOR'
+    }
+
     signingConfigs {
         release {
             /*
@@ -225,6 +233,8 @@ dependencies {
     androidTestImplementation "android.arch.persistence.room:testing:$rootProject.ext.roomVersion"
     testImplementation "android.arch.core:core-testing:$rootProject.ext.archVersion"
     androidTestImplementation "android.arch.core:core-testing:$rootProject.ext.archVersion"
+    androidTestImplementation "com.android.support.test:runner:$rootProject.ext.supportTest"
+    androidTestUtil "com.android.support.test:orchestrator:$rootProject.ext.supportTest"
 
 }