### Question:
DatabaseServerConfigService extends AbstractArchivistService<DatabaseServerConfig> implements ResourceBasedCrnProvider { public Set<DatabaseServerConfig> findAll(Long workspaceId, String environmentCrn) { if (environmentCrn == null) { throw new IllegalArgumentException("No environment CRN supplied."); } return repository.findByWorkspaceIdAndEnvironmentId(workspaceId, environmentCrn); }  Set<DatabaseServerConfig> findAll(Long workspaceId, String environmentCrn); DatabaseServerConfig create(DatabaseServerConfig resource, Long workspaceId, boolean test); DatabaseServerConfig update(DatabaseServerConfig resource); DatabaseServerConfig release(String resourceCrn); @Override DatabaseServerConfig delete(DatabaseServerConfig resource); DatabaseServerConfig getByName(Long workspaceId, String environmentCrn, String name); DatabaseServerConfig getByCrn(String resourceCrn); Optional<DatabaseServerConfig> getByCrn(Crn resourceCrn); Optional<DatabaseServerConfig> getByClusterCrn(String clusterCrn); DatabaseServerConfig deleteByCrn(String crn); @Override JpaRepository repository(); Set<DatabaseServerConfig> getByCrns(Set<String> crns); String testConnection(String crn); String testConnection(DatabaseServerConfig resource); String createDatabaseOnServer(String serverCrn, String databaseName, String databaseType, Optional<String> databaseDescription); @Override AuthorizationResourceType getResourceType(); @Override String getResourceCrnByResourceName(String resourceName); @Override List<String> getResourceCrnListByResourceNameList(List<String> resourceNames); @Override List<String> getResourceCrnsInAccount();  }### Answer:
@Test public void testFindAll() { when(repository.findByWorkspaceIdAndEnvironmentId(0L, ENVIRONMENT_CRN)).thenReturn(Collections.singleton(server)); Set<DatabaseServerConfig> servers = underTest.findAll(0L, ENVIRONMENT_CRN); assertEquals(1, servers.size()); assertEquals(1L, servers.iterator().next().getId().longValue()); }