Vtyjkyuk

I am developing an Android application where testing is part of development process. Testing in general is new domain for me therefore, i struggle often. I need an advice on unit testing a method which I use to perform a user login. Since method is void and implements callbacks I assume that either class or some of the objects should be mocked. In my application I use JUnit, Robolectric and Mockito for testing purposes.

I was able to perform a test to check if method with its parameters is being called but I am curious(dont know) how can I test the onResponse & onErrorResponse callbacks. I have provided the code below. Thanks in advance.

 public void loginUser(String email,String pass)
 try 
 requestQueue = Volley.newRequestQueue(getActivity().getApplicationContext());
 StringRequest request = new StringRequest(Request.Method.POST, Url+"/checkUser.php", new Response.Listener<String>() 
 @Override
 public void onResponse(String response) 

 if(response.contains("present"))
 Toast.makeText(getActivity(), "Welcome", Toast.LENGTH_SHORT).show();
 Intent intent = new Intent(getActivity(), MainActivity.class);
 startActivity(intent);
 
 else
 Toast.makeText(getActivity(), response, Toast.LENGTH_SHORT).show();
 
 
 , new Response.ErrorListener() 
 @Override
 public void onErrorResponse(VolleyError error) 
 Toast.makeText(getActivity(), "Error", Toast.LENGTH_SHORT).show();
 
 )
 @Override
 protected Map<String, String> getParams() throws AuthFailureError 
 Map<String,String> parameters = new HashMap<String,String>();
 parameters.put("email",email);
 parameters.put("password",pass);

 return parameters;
 
 ;
 requestQueue.add(request);
 catch (Exception o)Log.w("TAG",o.getMessage());
 //loginUser

@Test
public void testLoginCall() throws Exception 
 loginFragment = Mockito.mock(LoginFragment.class);
 doNothing().when(loginFragment).loginUser("email","pass");
 loginFragment.loginUser("email","pass");
 verify(loginFragment,times(1)).loginUser("email","pass");