### Question:
DatabaseServerConfigService extends AbstractArchivistService<DatabaseServerConfig> implements ResourceBasedCrnProvider { @VisibleForTesting boolean validateDatabaseName(String databaseName) { return VALID_DATABASE_NAME.matcher(databaseName).matches(); }  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 testValidateDatabaseName() { assertThat(underTest.validateDatabaseName("goodname"), is(true)); assertThat(underTest.validateDatabaseName("good_name"), is(true)); assertThat(underTest.validateDatabaseName("_good_name"), is(true)); assertThat(underTest.validateDatabaseName("_good-name"), is(true)); assertThat(underTest.validateDatabaseName("bad##name"), is(false)); assertThat(underTest.validateDatabaseName("_bad##name"), is(false)); assertThat(underTest.validateDatabaseName("-bad_name"), is(false)); }