import junit.framework.TestCase;

public class TU_Test extends TestCase {

    public void testStuff() {
        assertEquals("aft", "af");
    }

}

junit.framework.ComparisonFailure: expected:<...t> but was:<...>
at com.redprairie.test.TU_Test.testStuff(TU_Test.java:33)
at java.lang.reflect.Method.invokeNative(Native Method)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:169)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:154)
at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:529)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1448)

private void _assertEquals(String expected, String actual) {
    assertEquals("expected <" + expected + "> but was <" + actual + ">", expected, actual);
}