Even more assertions

If the assertions that are reviewed previously do not seem to be enough for your tests' needs, there is still another class included in the Android framework that covers other cases. This class is MoreAsserts (http://developer.android.com/reference/android/test/MoreAsserts.html).

These methods are also overloaded to support different parameter types. Among the assertions, we can find the following:

The following test checks for an error during the invocation of the capitalization method called via a click on the UI button:

@UiThreadTest
public void testNoErrorInCapitalization() {
String msg = "capitalize this text";
editText.setText(msg);

button.performClick();

String actual = editText.getText().toString();
String notExpectedRegexp = "(?i:ERROR)";
String errorMsg = "Capitalization error for " + actual;
assertNotContainsRegex(errorMsg, notExpectedRegexp, actual);
}

If you are not familiar with regular expressions, invest some time and visit http://developer.android.com/reference/java/util/regex/package-summary.html because it will be worth it!

In this particular case, we are looking for the word ERROR contained in the result with a case-insensitive match (setting the flag i for this purpose). That is, if for some reason, capitalization doesn't work in our application, and it contains an error message, we can detect this condition with the assertion.

INFO/TestRunner(610): ----- begin exception -----
INFO/TestRunner(610): android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
INFO/TestRunner(610):     at android.view.ViewRoot.checkThread(ViewRoot.java:2932)
[...]
INFO/TestRunner(610):     at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1447)
INFO/TestRunner(610): ----- end exception -----