@Override
	public RegisteredClient getClientConfiguration(ServerConfiguration issuer) {

		return clients.get(issuer.getIssuer());
	}
@Test
	public void getClientConfiguration_noIssuer() {
		Mockito.when(mockServerConfig.getIssuer()).thenReturn("www.badexample.net");

		RegisteredClient actualClient = service.getClientConfiguration(mockServerConfig);

		assertThat(actualClient, is(nullValue()));
	}