### Question:
LicenseeService { public static Page<Licensee> list(final Context context, final String filter) throws NetLicensingException { final Map<String, Object> params = new HashMap<>(); if (StringUtils.isNotBlank(filter)) { params.put(Constants.FILTER, filter); } return NetLicensingService.getInstance().list(context, Constants.Licensee.ENDPOINT_PATH, params, Licensee.class); }  static Licensee create(final Context context, final String productNumber, final Licensee licensee); static Licensee get(final Context context, final String number); static Page<Licensee> list(final Context context, final String filter); static Licensee update(final Context context, final String number, final Licensee licensee); static void delete(final Context context, final String number, final boolean forceCascade); @Deprecated static ValidationResult validate(final Context context, final String number, final String productNumber,
            final String licenseeName, final ValidationParameters validationParameters, final MetaInfo... meta); static ValidationResult validate(final Context context, final String number,
            final ValidationParameters validationParameters, final MetaInfo... meta); static void transfer(final Context context, final String number, final String sourceLicenseeNumber);  }### Answer:
@Test public void testList() throws Exception { final Page<Licensee> licensees = LicenseeService.list(context, null); assertNotNull(licensees); assertTrue(licensees.hasContent()); assertEquals(3, licensees.getItemsNumber()); assertEquals(licenseeNumber, licensees.getContent().get(0).getNumber()); assertEquals(true, licensees.getContent().get(1).getActive()); assertEquals(productNumber, licensees.getContent().get(2).getProduct().getNumber()); }