### Question:
EveryoneGetsDataLookBackServiceImpl implements LookBackService { @Override public String getPractitionerNPIFromRoster(UUID orgID, String providerOrRosterID, String patientMBI) { return UUID.randomUUID().toString(); }  @Override String getPractitionerNPIFromRoster(UUID orgID, String providerOrRosterID, String patientMBI); @Override LookBackAnswer getLookBackAnswer(ExplanationOfBenefit explanationOfBenefit, UUID organizationID, String practitionerNPI, long withinMonth);  }### Answer:
@Test public void alwaysReturnUUIDFromGetProviderIDFromRosterTest() { String npi = lookBackService.getPractitionerNPIFromRoster(UUID.randomUUID(), UUID.randomUUID().toString(), UUID.randomUUID().toString()); Assertions.assertNotNull(npi); }