@Test
    public void testMissingClient() {
        val clients = new Clients();
        clients.setCallbackUrl(CALLBACK_URL);
        TestsHelper.expectException(() -> clients.setClients((List<Client>) null), TechnicalException.class, "clients cannot be null");
    }
This class tests the {@link Clients} class.

@author Jerome Leleu
@since 1.3.0
pac4j-core/src/test/java/org/pac4j/core/client/ClientsTests.java