Check if a custom progress DialogFragment is shown or not using Espresso?
<p>I have a custom progress dialog with a progressbar and a message displayed during network calls.(For e.g. Logging in..., Fetching data etc., ).</p>

<p>I want to write a test to verify the dialogfragment with given text is displayed or not.</p>

<p><strong>CustomProgressDialog.java</strong></p>

<pre><code>public class CustomProgressDialog extends DialogFragment {

  private static final String KEY_MESSAGE = "message";
  public static final String TAG_PROGRESS_DIALOG = "progress_dialog";

  @BindView(R.id.progressbar) ProgressBar mProgressBar;
  @BindView(R.id.progress_textview) TextView mProgressTextView;

  private Unbinder mUnbinder;

  public static CustomProgressDialog start(String progressMessage) {
    CustomProgressDialog dialog = new CustomProgressDialog();

    Bundle bundle = new Bundle();
    bundle.putString(KEY_MESSAGE, progressMessage);
    dialog.setArguments(bundle);
    return dialog;
  }

  @Override public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setRetainInstance(true);
    setCancelable(false);
  }

  @Override public Dialog onCreateDialog(Bundle savedInstanceState) {
    LayoutInflater inflater = getActivity().getLayoutInflater();

    Bundle bundle = getArguments();
    String mProgressMessage;
    if (bundle != null &amp;&amp; bundle.containsKey(KEY_MESSAGE)) {
      mProgressMessage = bundle.getString(KEY_MESSAGE);
    } else {
      mProgressMessage = getActivity().getString(R.string.progress_loading);
    }

    View view = inflater.inflate(R.layout.dialog_custom_progress, null);
    mUnbinder = ButterKnife.bind(this, view);
    mProgressTextView.setText(mProgressMessage);

    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    builder.setView(view);

    return builder.create();
  }


  /**
   * Helper method to show a progress dialog with a message.
   */
  public static void showDialog(FragmentActivity activity, String message) {
    showDialog(activity, message, TAG_PROGRESS_DIALOG);
  }

  /**
   * Helper method to show a progress dialog with a message.
   */
  public static void showDialog(FragmentActivity activity, String message, String tag) {
    CustomProgressDialog progressDialog = CustomProgressDialog.start(message);
    progressDialog.show(activity.getSupportFragmentManager(), tag);
  }

  public static void hideDialog(FragmentActivity activity) {
    hideDialog(activity, TAG_PROGRESS_DIALOG);
  }

  /**
   * Helper method to hide a progress dialog.
   */
  public static void hideDialog(FragmentActivity activity, String tag) {
    FragmentManager fragmentManager = activity.getSupportFragmentManager();
    DialogFragment dialogFragment = (DialogFragment) fragmentManager.findFragmentByTag(tag);
    if (dialogFragment != null) {
      Timber.d("Gonna dismiss the dialog.");
      dialogFragment.dismiss();
    }
  }

  @Override public void onDestroyView() {
    if (getDialog() != null &amp;&amp; getRetainInstance()) {
      getDialog().setDismissMessage(null);
      mUnbinder.unbind();
    }
    super.onDestroyView();
  }
}
</code></pre>

<p><strong>dialog_custom_progress.xml</strong></p>

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/root_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/white"
    android:layout_marginTop="@dimen/spacing_small"
    android:layout_marginBottom="@dimen/spacing_small"
    android:padding="@dimen/spacing_xlarge"
    &gt;

  &lt;ProgressBar
      android:id="@+id/progressbar"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_alignParentLeft="true"
      android:layout_centerVertical="true"
      android:indeterminate="true"
      android:indeterminateTint="@color/primary_dark"
      android:indeterminateTintMode="src_in"
      /&gt;

  &lt;TextView
      android:id="@+id/progress_textview"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_centerVertical="true"
      android:gravity="left"
      android:layout_marginLeft="@dimen/spacing_medium"
      android:layout_toRightOf="@+id/progressbar"
      android:maxLines="3"
      tools:text="@string/placeholder_progress_text"
      style="@style/ProgressTextStyle"
      /&gt;

&lt;/RelativeLayout&gt;
</code></pre>

<p><strong>LoginFragment.java</strong></p>

<pre><code>private void doLogin() {
  //blah.. blah ..
  CustomProgressDialog.showDialog(getActivity(),
        getActivity().getString(R.string.progress_logging_in));
}
</code></pre>

<p><strong>Sample testcase</strong></p>

<pre><code> @Test public void checkProgressBar_displayedWhileLoggingIn() throws Exception {
    // GIVEN
    ...... 

    // WHEN
    onView(LOGIN_BUTTON).perform(click());

    // THEN
    // TODO check for progress bar is displayed.
    //onView(withText(R.string.progress_logging_in)).check(matches(isDisplayed()));                
    onView(withId(R.id.progress_textview)).check(matches(isDisplayed()));

  }
</code></pre>

<p>I'd got the following error for the above testcase:</p>

<pre><code>android.support.test.espresso.NoMatchingViewException: No views in hierarchy found matching: with id: com.custom.android.internal.debug:id/progress_textview
</code></pre>

<p>Although <code>progress_textview</code> is displayed on the screen.</p>