@Test
    void testGetLdapContextWithoutUrl() throws NamingException {
        assertThrows(IllegalStateException.class, () -> {
            factory.getLdapContext("foo", "bar");
        });
    }
This is the only test that does not fake the JNDI environment.  It is provided for 100% test coverage.

@throws NamingException thrown because the host is always broken.
core/src/test/java/org/apache/shiro/realm/ldap/JndiLdapContextFactoryTest.java