@Before
public void setUp() throws Exception {
    try {
        SimpleNamingContextBuilder builder = new SimpleNamingContextBuilder();
        BasicDataSource ds = new BasicDataSource();
        ds.setDriverClassName("org.postgresql.Driver");
        ds.setUrl("jdbc:postgresql://address:port/db");
        ds.setUsername("user");
        ds.setPassword("pass");
        builder.bind("jdbc/db", ds);

        builder.activate();

        System.out.println("connected");
    } catch (NamingException ex) {
        System.err.println("error: " + ex.getMessage());
    }

}

import org.apache.commons.dbcp2.BasicDataSource;
import org.springframework.mock.jndi.SimpleNamingContextBuilder;