Example Gradle file for an Android Unit Test app

build.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 22
    buildToolsVersion "22.0.0"

    defaultConfig {
        minSdkVersion 18
    }

    sourceSets {
        androidTest {
            setRoot('src/test')
        }
    }
}

repositories {
    mavenCentral()
}

dependencies {
    testCompile 'junit:junit:4.12'
    testCompile 'org.mockito:mockito-core:2.0.5-beta'
    testCompile 'com.android.support:support-v4:22.0.0'
}