Mockup JNDI datasource for JUnit test

Question

I'm trying to mockup JNDI datasource into JUnit test but for some reason it's not working:

I use these imports:

import static org.mockito.ArgumentMatchers.anyInt;
import static org.mockito.ArgumentMatchers.anyString;
import static org.mockito.Mockito.doReturn;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;    
import javax.activation.DataSource;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.xml.bind.JAXBException;    
import org.junit.BeforeClass;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.runner.RunWith;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.boot.test.mock.mockito.MockBean;
import org.springframework.mock.jndi.SimpleNamingContextBuilder;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

@SpringBootTest(classes = Application.class)
@RunWith(SpringJUnit4ClassRunner.class)
public class BinCountryCheckFilterImplTest    {

    ..........

    @MockBean
    private static DataSource dataSource;

    @BeforeClass
    public static void setupJndi() throws Exception {
        SimpleNamingContextBuilder.emptyActivatedContextBuilder();
        Context context = new InitialContext();
        context.bind("java:global/production_gateway", dataSource);
    }

    @BeforeEach
    public void beforeEachTest() throws IOException {    
        ........          
    }

    @Test
    public void testBinCountryCheckFilterImpl(){
    .....

}

Is there some way to solve this? Do you see some issues with the imported packages? I need to use JUnit5.

Answer 1

The problem is that you are mixing JUnit 4 with JUnit 5 aka Jupiter. @RunWith and @BeforeClass are from JUnit 4, @BeforeEach is from Jupiter; @Test might be from either depending on the import.

If you replace @BeforeEach with @Before your setup could work; at least you'll be closer to something working. Make sure that all your imports are either from org.junit or from org.junit.jupiter.api