Testing Gradle Dependencies

build.gradle

...

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:27.1.1'
    
    testImplementation 'junit:junit:4.12'
    testImplementation 'org.hamcrest:hamcrest-library:1.3'
    androidTestImplementation ('com.android.support.test:runner:0.5'){
        exclude module: 'support-annotations'
    }

    // Set this dependency to use JUnit 4 rules
    androidTestImplementation ('com.android.support.test:rules:0.5'){
        exclude module: 'support-annotations'
    }

    // Set this dependency to build and run Espresso tests
    androidTestImplementation ('com.android.support.test.espresso:espresso-core:2.2.2'){
        exclude module: 'support-annotations'
    }


    // required if you want to use Mockito for unit tests
    testImplementation 'org.mockito:mockito-core:2.18.3'

    // required if you want to use Mockito for Android tests
    androidTestImplementation 'org.mockito:mockito-android:2.18.3'
    androidTestImplementation 'com.squareup.okhttp3:mockwebserver:3.6.0'


}

...