android依赖和测试依赖冲突

我是andorid新手，使用android studio 2.0.0写了一个hello world程序。
现在想写一个android测试，加入了测试框架依赖以后，出现了版本冲突，错误如下
Error:Conflict with dependency 'com.android.support:support-annotations'. Resolved versions for app (23.3.0) and test app (22.2.0) differ. See http://g.co/androidstudio/app-test-app-conflict for details.
哪位大神帮忙看看怎么处理，先谢了。

apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.3"

    defaultConfig {
        applicationId "com.example.myapp"
        minSdkVersion 15
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    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-v7:23.3.0'
    // Android Test
    androidTestCompile 'com.android.support.test:runner:0.3'
    androidTestCompile 'com.android.support.test:rules:0.3'
    androidTestCompile 'com.android.support.test.espresso:espresso-core:2.2'
    androidTestCompile 'com.android.support.test.uiautomator:uiautomator-v18:2.1.1'
}

http://my.oschina.net/stphwn/blog/343711

这是gradle导入的依赖jar，该如何修改dependencies