无法解决:ubuntu 上 android studio 1.4 中的 junit:junit:4.12

当我在 ubuntu 上的 android studio 1.4 中创建新项目时.

When i am creating new project in android studio 1.4 on ubuntu.

我在

testCompile 'junit:junit:4.12' 

在 app/build.gradle 上有消息

with message on app/build.gradle

Error:(23, 17) Failed to resolve: junit:junit:4.12
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//构建 gradle(应用模块)

// build gradle (app module)

apply plugin: 'com.android.application'

android {
compileSdkVersion 23
buildToolsVersion "23.0.1"

defaultConfig {
    applicationId "com.example.abhishek.vearch"
    minSdkVersion 16
    targetSdkVersion 23
    versionCode 1
    versionName "1.0"
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}
}

dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.0.1'
compile 'com.android.support:design:23.0.1'
}

//构建 gradle(项目)

// build gradle (project)

//顶级构建文件，您可以在其中添加所有子项目/模块通用的配置选项.

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
repositories {
    jcenter()
}
dependencies {
    classpath 'com.android.tools.build:gradle:1.3.0'

    // NOTE: Do not place your application dependencies here; they belong
    // in the individual module build.gradle files
}
}

allprojects {
repositories {
    jcenter()
}
}

task clean(type: Delete) {
delete rootProject.buildDir
}

• 我已经尝试过 错误:(23, 17) 无法解析:junit:junit:4.12