Unable to use Arguement Captors, No argument value was captured!

[David Ozersky]

Hi All, 

I'm new to Mockito,  and I'm trying to use Mockito to test a sample app demonstrating the MVP design pattern.  This is the error I get --> 

No argument value was captured!

You might have forgotten to use argument.capture() in verify()...

...or you used capture() in stubbing but stubbed method was not called.

Be aware that it is recommended to use capture() only with verify()

Examples of correct argument capturing:

    ArgumentCaptor<Person> argument = ArgumentCaptor.forClass(Person.class);

    verify(mock).doSomething(argument.capture());

    assertEquals("John", argument.getValue().getName());

I've been fiddling around with this for a few hours, and I can't figure out which requirement I'm not meeting.  I'm calling verify on stubs, I'm only using matchers as arguments, and all of the interactions are being done on mocks. 

Here's a link to the project.  

https://github.com/spark85/androidmvp/tree/development

Here is the code --> 

package com.antonioleiva.mvpexample.app.main;

import com.antonioleiva.mvpexample.app.Login.LoginInteractor;
import com.antonioleiva.mvpexample.app.Login.LoginInteractorImpl;
import com.antonioleiva.mvpexample.app.Login.LoginPresenterImpl;
import com.antonioleiva.mvpexample.app.Login.LoginView;

import net.bytebuddy.dynamic.scaffold.TypeWriter;

import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.ArgumentCaptor;
import org.mockito.Mock;
import org.mockito.runners.MockitoJUnitRunner;

import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertThat;
import static org.mockito.ArgumentCaptor.forClass;
import static org.mockito.ArgumentMatchers.anyObject;
import static org.mockito.ArgumentMatchers.anyString;
import static org.mockito.ArgumentMatchers.eq;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
/**
 * Created by davidozersky on 2016-11-19.
 */

@RunWith(MockitoJUnitRunner.class)
public class LoginPresenterTest {

    @Mock
    LoginView loginView;

    @Mock
    private LoginInteractor loginInteractor;

    @Mock
    private LoginInteractor.OnLoginFinishedListener loginFinishedListener;

    private LoginPresenterImpl loginPresenter;

    @Before
    public void setup() {
        loginPresenter = new LoginPresenterImpl(loginView, loginInteractor);
    }

    @Test
    public void testValidateCredentialsCallsLogin() {
        ArgumentCaptor<String> usernameCaptor = forClass(String.class);
        ArgumentCaptor<String> passwordCaptor = forClass(String.class);
        ArgumentCaptor<LoginInteractor.OnLoginFinishedListener> loginInteractorArgumentCaptor = forClass(LoginInteractor.OnLoginFinishedListener.class);
        loginPresenter.validateCredentials("username", "password");
        verify(loginInteractor, times(1)).login(usernameCaptor.capture(),
                                                passwordCaptor.capture(),
                                                loginInteractorArgumentCaptor.capture());
        assertThat(usernameCaptor.getValue(), is("username"));
        assertThat(passwordCaptor.getValue(), is("password"));
        assertThat(loginInteractorArgumentCaptor.getValue(), is((LoginInteractor.OnLoginFinishedListener) loginPresenter));
    }
}

[Eric Lefevre-Ardant]

I cannot really see what's wrong. Maybe a simplified version with the production code would help.

 

Any chance the login() method is not being called here for some reason?

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[Christian Schwarz]

Try to verify the call with argument matchers first and check if it fails or not. If it fails you know that the expected login never happened.

verify(loginInteractor).login(any(),any(),any());