Possible errors while running test cases

While writing functional or unit test cases through Robotium or  InstrumentationTestCase if you get

TestCase class com.example.test.WelcomeActivityText is missing a public constructor with no parameters or a single String parameter

at run time then this must be because of your test project dint include a default constructor. That is

import com.example.WelcomeActivity;
import com.jayway.android.robotium.solo.Solo;
import android.test.ActivityInstrumentationTestCase2;

public class WelcomeActivityText extends ActivityInstrumentationTestCase2<WelcomeActivity> {

    private Solo mSolo;
    public WelcomeActivityText() {
    protected void setUp() throws Exception {
        mSolo = new Solo(getInstrumentation());
    public void testWelcomeActivity(){
        assertEquals(WelcomeActivity.class, getActivity().getClass());
        mSolo.assertCurrentActivity("WelcomeActivity is not shown", WelcomeActivity.class);


If you create a default constructor like the above code you can get ride of this error.

Invalid Package: ” could not be found or has no tests”

If you get this error means then please do check you have started your test case function with test as prefix (testWelcomeActivity).