Unit tests

JUnit

JUnit is a simple framework to write repeatable tests. It is an instance of the xUnit architecture for unit testing frameworks.

Setting up testing framework

Local tests with JUnit4 and Mockito to interact with Android dependencies

We needed to add the following lines to the build.gradle file dependencies section.

dependencies {
    testCompile 'junit:junit:4.12'
    testCompile 'org.mockito:mockito-core:1.10.19'
}

Instrumented Unit test with Android Testing Suppor Library

These are tests that run on physical devices and emulators, and they can take advantage of the Android framework APIs and supporting APIs, such as the Android Testing Support Library.

We needed to add the following lines to the build.gradle file dependencies section.

dependencies {
    androidTestCompile 'org.mockito:mockito-core:1.10.19'
    androidTestCompile 'com.android.support:support-annotations:25.3.1'
    androidTestCompile 'com.android.support.test:runner:0.5'
    androidTestCompile 'com.android.support.test:rules:0.5'
    androidTestCompile 'org.hamcrest:hamcrest-library:1.3'
    androidTestCompile 'com.android.support.test.espresso:espresso-core:2.2.2'
    androidTestCompile 'com.android.support.test.uiautomator:uiautomator-v18:2.1.2'
}