Decoupled tests, go back activity

I'm pretty new to android and I'm trying to create some instrumented tests over an existing app.

There are two related activities:

Login --> Dashboard

Once you login correctly there is an intent that starts the Dashboard activity.

I have 2 instrumented tests:

• test_nologin_with_bad_credentials: shows an error
• test_login_with_good_credentials: initialize some db info an starts an intent that moves you into a DashboardActivity.

If I run them independently everything goes fine, but if I run them together and the 'good credentials' test comes first the 'bad credentials' starts with the app on another activity and thus the test fails.

Relevant code:

public class LoginActivityTest extends ActivityInstrumentationTestCase2<LoginActivity> {
  ...
    protected void setUp() throws Exception {
        super.setUp();

        cleanDB();
        setActivityInitialTouchMode(true);

        loginActivity = getActivity();
        userView =(TextView) loginActivity.findViewById(R.id.user);
        passView =(TextView) loginActivity.findViewById(R.id.password);
        signInButton =(Button) loginActivity.findViewById(R.id.email_sign_in_button);
        res = getInstrumentation().getTargetContext().getResources();
    }

   public void test_form_initial_empty() {
        assertEquals("", userView.getText().toString());
        assertEquals("", passView.getText().toString());
    }

    public void test_nologin_with_bad_credentials(){
        //GIVEN
        setText(userView, "bad");
        setText(passView, "bad");

        //WHEN
        TouchUtils.clickView(this, signInButton);

        //THEN
        String error=userView.getError().toString();
        assertEquals(res.getString(R.string.login_error_bad_credentials), error);
    }

    public void test_login_with_good_credentials(){
        //GIVEN
        Instrumentation.ActivityMonitor receiverActivityMonitor =getInstrumentation().addMonitor(DashboardActivity.class.getName(),null, false);
        setText(userView, "user");
        setText(passView, "user");

        //WHEN
        TouchUtils.clickView(this, signInButton);

        //THEN
        assertNotNull(Session.getUser());

        //THEN
        DashboardActivity dashboardActivity = (DashboardActivity) receiverActivityMonitor.waitForActivityWithTimeout(TIMEOUT_IN_MS);
        assertNotNull("DashboardActivity is started", dashboardActivity);

        //CLEANUP
        cleanDB();
        dashboardActivity.finish();
    }
}

How can I 'tearDown' each test so next one starts from scratch?