Truth Android

A set of Truth assertions geared toward testing Android.

Writing tests is not the most glamorous part of developing an Android application but it is an invaluable one. Using libraries like JUnit and Truth provide a great starting point for writing tests.

This library is an extension of Truth which aims to make it even easier to test Android.

Truth Android
Regular JUnit
assertEquals(View.GONE, view.getVisibility());
Regular Truth

When failing, the Truth Android assertion produces an output which allows you to immediately recognize the problem: Expected visibility <gone> but was <invisible>.

Compare that to the output of regular Truth expected:<[8]> but was:<[4]> and regular JUnit expected: <8> but was: <4> and you should immediately see the advantage.

Because Truth Android offers assertions directly on objects rather than properties they can be chained together.

Truth Android
Regular JUnit
assertEquals(View.VISIBLE, layout.getVisibility());
assertEquals(VERTICAL, layout.getOrientation());
assertEquals(4, layout.getChildCount());
assertEquals(SHOW_DIVIDERS_MIDDLE, layout.getShowDividers());
Regular Truth

Assertions exist for nearly every object that you would ever want to test, from LinearLayout to ActionBar to Fragment to MenuItem. Everything in the support library is included too.

To get started writing tests add the following import:

import static;
Add-On Modules

Modules are also provided for the add-on Android libraries. Add the dependency (listed below) and use the following imports:

  • support-v4

    import static;
  • Google Play Services

    import static;
  • appcompat-v7

    import static;
  • design

    import static;
  • mediarouter-v7

    import static;
  • gridlayout-v7

    import static;
  • cardview-v7

    import static;
  • recyclerview-v7

    import static;
  • pallete-v7

    import static;

The provided assertions have also been designed to be extended for any custom controls you have developed.

public class CustomLayout extends LinearLayout {
  public int getBehavior() {
    /* ... */

Use the following pattern to set up your assertions.

public final class CustomLayoutSubject extends AbstractLinearLayoutSubject<CustomLayoutSubject, CustomLayout> {
  private static final SubjectFactory<CustomLayoutSubject, CustomLayout> CUSTOM_LAYOUT_SUBJECT_FACTORY =
      new SubjectFactory<CustomLayoutSubject, CustomLayout>() {
        public CustomLayoutSubject getSubject(FailureStrategy failureStrategy, @Nullable CustomLayout target) {
          return new CustomLayoutSubject(failureStrategy, target);

  public static CustomLayoutSubject assertThat(@Nullable CustomLayout actual) {
    return assertAbout(CUSTOM_LAYOUT_SUBJECT_FACTORY).that(actual);

  private CustomLayoutSubject(FailureStrategy failureStrategy, CustomLayout subject) {
    super(failureStrategy, subject);

  public CustomLayoutSubject hasSomeBehavior() {
        .withFailureMessage("Expected some behavior but was doing other behavior.")
    return this;

Now static import CustomLayoutSubject.assertThat in your test classes.

For more information about writing custom assertions see the official documentation.

  • Android module:

    androidTestCompile 'com.pkware.truth-android:truth-android:1.0.0'
  • support-v4 module:

    androidTestCompile 'com.pkware.truth-android:truth-android-support-v4:1.0.0'
  • Google Play Services module:

    androidTestCompile 'com.pkware.truth-android:truth-android-play-services:1.0.0'
  • Design library module:

    androidTestCompile 'com.pkware.truth-android:truth-android-pallete-v7:1.0.0'
  • appcompat-v7 module:

    androidTestCompile 'com.pkware.truth-android:truth-android-appcompat-v7:1.0.0'
  • mediarouter-v7 module:

    androidTestCompile 'com.pkware.truth-android:truth-android-mediarouter-v7:1.0.0'
  • gridlayout-v7 module:

    androidTestCompile 'com.pkware.truth-android:truth-android-gridlayout-v7:1.0.0'
  • cardview-v7 module:

    androidTestCompile 'com.pkware.truth-android:truth-android-cardview-v7:1.0.0'
  • recyclerview-v7 module:

    androidTestCompile 'com.pkware.truth-android:truth-android-recyclerview-v7:1.0.0'
  • pallete-v7 module:

    androidTestCompile 'com.pkware.truth-android:truth-android-pallete-v7:1.0.0'
Fork me on GitHub

by PKWARE, Inc.

Template by

Square, Inc.