public void testEditText_OperandOneHint() {
        String operandOneHint = mActivity.getString(R.string.type_operand_one_hint);
        onView(withId(R.id.operand_one_edit_text)).check(matches(withHint(operandOneHint)));
    }
JUnit3 Ui Tests for {@link CalculatorActivity} using the {@link AndroidJUnitRunner}. This class
uses the Junit3 syntax for tests and extends {@link ActivityInstrumentationTestCase2}.
<p>
With the new AndroidJUnit runner you can run both JUnit3 and JUnit4 tests in a single test
test suite. The {@link AndroidRunnerBuilder} which extends JUnit's {@link
AllDefaultPossibilitiesBuilder} will create a single {@link TestSuite} from all tests and run
them.
<p>
ActivityInstrumentationTestCase2 will be deprecated soon. Please use {@link ActivityTestRule}
when writing new tests. For an example on how to use {@link ActivityTestRule} please see
{@link CalculatorInstrumentationTest}.
runner/AndroidJunitRunnerSample/app/src/androidTest/java/com/example/android/testing/androidjunitrunnersample/OperationHintLegacyInstrumentationTest.java