add basic instrumentation test

Author: vkocheryzhkin

visionSamples/FaceTracker/app/build.gradle

@@ -5,16 +5,16 @@ android {
         config {
             keyAlias 'test'
             keyPassword 'test123321'
-            storeFile file('E:/Work/android-vision/signing/test.jks')
+            storeFile file('C:/Work/android-vision/signing/test.jks')
             storePassword 'test123321'
         }
     }
-    compileSdkVersion 24
+    compileSdkVersion 23
     buildToolsVersion '27.0.3'
     defaultConfig {
         applicationId "com.google.android.gms.samples.vision.face.facetracker"
         minSdkVersion 15
-        targetSdkVersion 24
+        targetSdkVersion 23
         versionCode 1
         versionName "1.0"
         externalNativeBuild {
@@ -29,8 +29,9 @@ android {
                 //cFlags "-D__STDC_FORMAT_MACROS"
 
             }
-        }
+        }    
         signingConfig signingConfigs.config
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }
     buildTypes {
         release {
@@ -39,6 +40,7 @@ android {
             signingConfig signingConfigs.config
         }
     }
+    testBuildType "release"
     externalNativeBuild {
         cmake {
             path "CMakeLists.txt"
@@ -49,9 +51,18 @@ android {
 }
 
 dependencies {
+    implementation 'com.android.support:support-annotations:27.1.1'
+
+    androidTestImplementation 'junit:junit:4.12'
+    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
+    androidTestImplementation 'com.android.support.test:runner:1.0.2'
+    androidTestImplementation 'com.android.support.test:rules:1.0.2'
+    androidTestImplementation 'org.hamcrest:hamcrest-library:1.3'
+
     implementation fileTree(include: ['*.jar'], dir: 'libs')
-    implementation 'com.android.support:support-v4:24.2.0'
-    implementation 'com.android.support:design:24.2.0'
+    implementation 'com.android.support:support-v4:23.4.0'
+    implementation 'com.android.support:design:23.4.0'
     implementation 'com.google.android.gms:play-services-vision:9.4.0+'
     implementation 'com.shamanland:xdroid-toaster:0.2.4'
+    
 }

visionSamples/FaceTracker/app/src/androidTest/java/com/google/android/gms/samples/vision/face/facetracker/ExampleInstrumentedTest.java

@@ -0,0 +1,21 @@
+package com.google.android.gms.samples.vision.face.facetracker;
+
+import android.content.Context;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static junit.framework.Assert.assertEquals;
+
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() throws Exception {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getTargetContext();
+
+        assertEquals("ch.hepia.iti.opencvnativeandroidstudio", appContext.getPackageName());
+    }
+}