title: can't sync gradle android studio 3.1.4
body: <p>I installed android studio 3.1.4 with gradle 4.4 but I can't sync it , 
  I read all topics about syncing but I get error from all dependencies, I added maven link, mavencentral, change implementation with compile but nothing worked </p>
  
  <p>these are the errors:</p>
  
  <blockquote>
    <p>Unable to resolve dependency for
    ':app@debugAndroidTest/compileClasspath': Could not resolve
    com.android.support.test:runner:1.0.1.</p>
    
    <p>Unable to resolve dependency for
    ':app@debugAndroidTest/compileClasspath': Could not resolve
    com.android.support.test.espresso:espresso-core:3.0.1.</p>
    
    <p>Unable to resolve dependency for
    ':app@releaseUnitTest/compileClasspath': Could not resolve
    com.android.support:appcompat-v7:28.0.0-rc01.</p>
    
    <p>Unable to resolve dependency for
    ':app@releaseUnitTest/compileClasspath': Could not resolve
    com.android.support.constraint:constraint-layout:1.1.2.</p>
  </blockquote>
  
  <p>and this is my gradle.build :</p>
  
  <pre><code>apply plugin: 'com.android.application'
  
  android {
      compileSdkVersion 28
      defaultConfig {
          applicationId "comcooking.wikiyar.myapplication"
          minSdkVersion 17
          targetSdkVersion 28
          versionCode 1
          versionName "1.0"
          testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
      }
      buildTypes {
          release {
              minifyEnabled false
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
          }
      }
  }
  
  dependencies {
      implementation fileTree(dir: 'libs', include: ['*.jar'])
      implementation 'com.android.support:appcompat-v7:28.0.0-rc01'
      implementation 'com.android.support.constraint:constraint-layout:1.1.2'
      testImplementation 'junit:junit:4.12'
      androidTestImplementation 'com.android.support.test:runner:1.0.1'
      androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
  }
  </code></pre>