But I am getting following failure trace.
junit.framework.AssertionFailedError: EditText with index 0 is not available!
at com.jayway.android.robotium.solo.Waiter.waitForAndGetView(Waiter.java:362)
at com.jayway.android.robotium.solo.Solo.enterText(Solo.java:1290)
at com.calculator.test.TestMain.testDisplayBlackBox(TestMain.java:28)
at java.lang.reflect.Method.invokeNative(Native Method)
at android.test.InstrumentationTestCase.runMethod(InstrumentationTestCase.java:204)
at android.test.InstrumentationTestCase.runTest(InstrumentationTestCase.java:194)
at android.test.ActivityInstrumentationTestCase2.runTest(ActivityInstrumentationTestCase2.java:186)
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)
Please reply at your convenience.