Example configuration for an app using Android Unit Test

build.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 22
    buildToolsVersion "22.0.0"

    defaultConfig {
        minSdkVersion 18
    }
}

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'
    testCompile ('org.powermock:powermock-api-mockito:1.6.2') {
        exclude module: 'hamcrest-core'
        exclude module: 'objenesis'
    }
    testCompile ('org.powermock:powermock-module-junit4:1.6.2') {
        exclude module: 'hamcrest-core'
        exclude module: 'objenesis'
    }
}