AssertionFailedError: <class> has no public constructor

Question

I am working with Android Studio and I need to add a unit tests to my project.
I read various tutorials, but nothing hepled me.
My problem is:
TestXMLParser.java:

public class TestXMLParser extends ActivityInstrumentationTestCase2<HomePageActivity> {

public TestXMLParser(Class<HomePageActivity> activityClass) {
    super(activityClass);
}

@Override
public void setUp() throws Exception {
    super.setUp();

    //Controller.init((Activity)getContext());
}

@Override
public void tearDown() throws Exception {
    super.tearDown();
}

public void testTrue() throws Exception {
    assertTrue(true);
}
...
}

When I run it, I see this message:

junit.framework.AssertionFailedError: Class cz.cvut.kosapp.jUnitTests.TestXMLParser has no public constructor TestCase(String name) or TestCase()
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:190)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:175)
at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:555)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1661)

I really do not know why. Other jUnit tests works well, for example when I use:

public class TestXMLParser extends AndroidTestCase { ...

in header, this works and tests are running correctly.
But I need use the Context (as a Activity) to run other code (in Controller class).

Do you have any idea how fix it?
Thank you for your comments.

Answer 1

You need to add either a default constructor or a constructor which takes a String as a parameter. Adding the following default constructor with a call to the base class constructor should work:

public TestXMLParser() {
    super(HomePageActivity.class);
}