Add Espresso Dependencies to your project :)

build.gradle

    testCompile 'junit:junit:4.12'
    testCompile 'org.hamcrest:hamcrest-all:1.3'

    //Provides AndroidJUnitRunner
    androidTestCompile ('com.android.support.test:runner:0.4.1') {
        exclude group: 'com.android.support', module: 'appcompat'
        exclude group: 'com.android.support', module: 'support-v4'
        exclude module: 'recyclerview-v7'
        exclude module: 'support-annotations'
    }
    // Provides JUnit 4 rules
    androidTestCompile ('com.android.support.test:rules:0.4.1') {
        exclude group: 'com.android.support', module: 'appcompat'
        exclude group: 'com.android.support', module: 'support-v4'
        exclude module: 'recyclerview-v7'
        exclude module: 'support-annotations'
    }
    // Builds and runs Espresso tests
    androidTestCompile ('com.android.support.test.espresso:espresso-core:2.2.1') {
        exclude group: 'com.android.support', module: 'appcompat'
        exclude group: 'com.android.support', module: 'support-v4'
        exclude module: 'recyclerview-v7'
        exclude module: 'support-annotations'
    }

    androidTestCompile ('com.android.support.test.espresso:espresso-intents:2.2.1') {
        exclude group: 'com.android.support', module: 'appcompat'
        exclude group: 'com.android.support', module: 'support-v4'
        exclude module: 'recyclerview-v7'
        exclude module: 'support-annotations'
    }

    androidTestCompile ('com.android.support.test.espresso:espresso-contrib:2.2.1') {
        exclude group: 'com.android.support', module: 'appcompat'
        exclude group: 'com.android.support', module: 'support-v4'
        exclude module: 'recyclerview-v7'
        exclude module: 'support-annotations'
    }

Always helpful! Thanks.