How to check Toolbar title in android instrumental test?

This works for me:

onView(allOf(instanceOf(TextView.class), withParent(withId(R.id.toolbar))))
    .check(matches(withText("toolbarTitile")));

If you're using an ActionBar, not a Toolbar, use this:

onView(allOf(instanceOf(TextView.class), 
     withParent(withResourceName("action_bar"))))
        .check(matches(withText("My ActionBar title")));

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^{Note: To quickly add the imports for these methods, put the blinking cursor on the unresolved method, then do Android Studio ➔ Help ➔ Find Action ➔ search for "show context action" or "show intention action" ➔ click on the result option ➔ A popup window will appear ➔ click on "Import static method ...". You can also assign a keyboard shortcut to "Show Context Actions". More info here. Another way is to enable "Add unambiguous imports on the fly" in the Settings.}

SOLUTION

The method is fine. As Chiu-Ki Chan wrote in her tutorial you can "pinpoint that one particular view". BUT you have to make sure you imported proper Toolbar:

import  android.support.v7.widget.Toolbar;

instead of:

import android.widget.Toolbar;

Here's an alternative (and more idiomatic approach):

onView(withId(R.id.toolbar)).check(matches(hasDescendant(withText(toolbarTitle))))