title: Cannot resolve symbol AndroidJUnit4
body: <p>I'm trying to add loginfacebook for my app. But when I added a repository that is need in doing this. It caused an error. The AndroidJUnit4 cannot resolve now.</p>
  
  <p><strong>ExampleInstrumentedTest.java</strong></p>
  
  <pre><code>package com.example.user.enyatravelbataan;
  
  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;
  import static org.junit.Assert.*;
  
  /**
   * Instrumentation test, which will execute on an Android device.
   *
   * @see &lt;a href="http://d.android.com/tools/testing"&gt;Testing documentation&lt;/a&gt;
   */
  @RunWith(AndroidJUnit4.class)
  public class ExampleInstrumentedTest {
  @Test
  public void useAppContext() throws Exception {
      // Context of the app under test.
      Context appContext = InstrumentationRegistry.getTargetContext();
  
      assertEquals("com.example.user.enyatravelbataan", 
  appContext.getPackageName());
  }
  }
  </code></pre>
  
  <p>and this is my build:gradle(app)</p>
  
  <pre><code>apply plugin: 'com.android.application'
  
   android {
  compileSdkVersion 24
  buildToolsVersion "24.0.3"
  useLibrary 'org.apache.http.legacy'
  
  
  repositories {
      mavenCentral()
  }
  
  defaultConfig {
      applicationId "com.example.user.enyatravelbataan"
      minSdkVersion 16
      targetSdkVersion 24
      versionCode 1
      versionName "1.0"
      testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
      multiDexEnabled true
  }
  buildTypes {
      release {
          minifyEnabled false
          proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
      }
  }
  }
  
  dependencies {
  compile fileTree(include: ['*.jar'], dir: 'libs')
  compile(name: 'wikitudesdk', ext: 'aar')
  // compile 'org.apache.httpcomponents:httpclient:4.5'
  // compile 'org.apache.httpcomponents:httpcore:4.4.1'
  compile files('libs/MD5Simply.jar')
  compile files('libs/GenAsync.1.2.jar')
  compile 'com.facebook.android:facebook-android-sdk:[4,5)'
  compile 'com.android.support:appcompat-v7:24.2.1'
  compile 'com.android.support:multidex:1.0.0'
  compile 'com.google.android.gms:play-services:9.8.0'
  compile 'com.google.android.gms:play-services-location:9.8.0'
  compile 'com.google.android.gms:play-services-appindexing:9.8.0'
  compile 'com.android.support:cardview-v7:24.2.1'
  compile 'com.squareup.picasso:picasso:2.5.2'
  compile 'com.android.support:design:24.2.1'
  compile 'com.android.volley:volley:1.0.0'
  compile 'com.android.support:support-v4:24.2.1'
  
  testCompile 'junit:junit:4.12'
  }
  
  repositories {
  flatDir {
      dirs 'libs'
  }
  }
  apply plugin: 'com.google.gms.google-services'
  </code></pre>