GWT UI unit test, fails

LoginViewTest.java

public class LoginViewTest {

	@Mock
	private TextBox username;
	
	@Mock
	private TextBox password;
	
	private LoginView loginView;

	@BeforeMethod
	public void initBefore() {
		MockitoAnnotations.initMocks(this);
		
		loginView = new LoginView(username, password);
	}
	
	@Test
	public void notValidUsernamePassword() {
		when(username.getText()).thenReturn("p");
		when(password.getText()).thenReturn("pass");
		Assert.assertFalse(loginView.validUsernameAndPassword());
	}
}