Assert progress of ProgressBar in Espresso test

Assert progress of ProgressBar in Espresso test

By : Cosmin
Date : January 11 2021, 03:32 PM
should help you out It would seem Espresso does not allow to check the progress attribute using a ViewInteraction. Although, it is possible to recover the progress bar view directly from the view and to assert its value using assertThat.
code :
public void ExampleAssertProgressBar(){
    ProgressBar progressBar = activity.getActivity().findViewById(R.id.progressBar);
    int progress = progressBar.getProgress();
    assertThat(progress, equalTo(50));

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Espresso android -- Evoke assert? (NOT a view assert)

Espresso android -- Evoke assert? (NOT a view assert)

By : user3324038
Date : March 29 2020, 07:55 AM
will help you It's possible to enable keyword asserts, but it requires a manual step, and it would be unusual to use keyword asserts in test code.
It's best to use the JUnit methods (assertTrue, etc.) as you would in unit tests.
Espresso: How do i assert if a particular activity is launched when i click on a item using espresso

Espresso: How do i assert if a particular activity is launched when i click on a item using espresso

By : RayB
Date : March 29 2020, 07:55 AM
Hope that helps You should simulate the process of clicking a button and then test if the activity at the top of the stack is the one you're looking for
code :
public class YourTestClass{

    public void testButton() {

        Assert.assertEquals(getActivityInstance().getClass(), YourActivityThatShouldStart.class);

    private Activity getActivityInstance() {
        final Activity[] currentActivity = {null};
        InstrumentationRegistry.getInstrumentation().runOnMainSync(new Runnable() {
            public void run() {
                Collection resumedActivities = ActivityLifecycleMonitorRegistry.getInstance().getActivitiesInStage(Stage.RESUMED);
                if (resumedActivities.iterator().hasNext()) {
                    currentActivity[0] = (Activity) resumedActivities.iterator().next();

        return currentActivity[0];

It is possible to test view below a progress dialog, using espresso?

It is possible to test view below a progress dialog, using espresso?

By : franceska
Date : March 29 2020, 07:55 AM
wish helps you Yes, you use a RootMatcher. For example:
code :
// Specifically target the main window view hierarchy
// Specifically disregard the dialog window view hierarchy
any method to wait until invisible progressbar in espresso test?

any method to wait until invisible progressbar in espresso test?

By : jameslopez
Date : March 29 2020, 07:55 AM
wish of those help So, you want to wait until your ProgressBar is hidden. You can either create an idling resource or use a custom ViewAction as this one:
code :
 * Perform action of waiting until the element is accessible & not shown.
 * @param viewId The id of the view to wait for.
 * @param millis The timeout of until when to wait for.
public static ViewAction waitUntilNotShown(final int viewId, final long millis) {
    return new ViewAction() {
        public Matcher<View> getConstraints() {
            return isRoot();

        public String getDescription() {
            return "wait for a specific view with id <" + viewId + "> is hidden during " + millis + " millis.";

        public void perform(final UiController uiController, final View view) {
            final long startTime = System.currentTimeMillis();
            final long endTime = startTime + millis;
            final Matcher<View> viewMatcher = withId(viewId);

            do {
                for (View child : TreeIterables.breadthFirstViewTraversal(view)) {
                    // found view with required ID
                    if (viewMatcher.matches(child) && !child.isShown()) {

            while (System.currentTimeMillis() < endTime);

            // timeout happens
            throw new PerformException.Builder()
                    .withCause(new TimeoutException())
onView(isRoot()).perform(waitUntilNotShown(R.id.theIdToWaitFor, 5000));
Assert exceptions in Android Espresso test

Assert exceptions in Android Espresso test

By : cloudsoft
Date : March 29 2020, 07:55 AM
may help you . Eventually I found a way to do it. I've created a custom Hamcrest matcher that allows you to verify a nested exception.
code :
public class NestedExceptionMatcher extends TypeSafeMatcher<Throwable> {

    private final Class<?> mExpectedType;
    private final Matcher<String> mMessageMatcher;

    static NestedExceptionMatcher expectNestedThrowable(Class<?> expectedType, Matcher<String> messageMatcher) {
        return new NestedExceptionMatcher(expectedType, messageMatcher);

    NestedExceptionMatcher(Class<?> expectedType, Matcher<String> messageMatcher) {
        mExpectedType = expectedType;
        mMessageMatcher = messageMatcher;

    protected boolean matchesSafely(Throwable item) {
        boolean matches = isMatch(item);

        Throwable currentThrowable = item.getCause();
        while (!matches && currentThrowable != null) {
            matches = isMatch(currentThrowable);
            currentThrowable = currentThrowable.getCause();

        return matches;

    public void describeTo(Description description) {
                .appendText("expects type ")
                .appendText(" with a message ")

    private boolean isMatch(Throwable t) {
        return t.getClass().isAssignableFrom(mExpectedType) && mMessageMatcher.matches(t.getMessage());
public class SomeActivityTest {

    public ActivityTestRule<SomeActivity> mRule = new ActivityTestRule<>(
            SomeActivity.class, false, false);

    public ExpectedException mExceptionRule = ExpectedException.none();

    public void testClick_whenInvalidParamsAreSet_shouldThrowException() {
                containsString("parameter isn't defined")


    private Intent getIntentWithInvalidParams() {
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