### Question:
RepositoryConfigValidationService { public RepoConfigValidationV4Response validate(RepoConfigValidationV4Request request) { RepoConfigValidationV4Response result = new RepoConfigValidationV4Response(); if (request != null) { String ambariBaseUrl = request.getAmbariBaseUrl(); if (isNotEmpty(ambariBaseUrl)) { result.setAmbariBaseUrl(repoUrlAvailable(ambariBaseUrl, "Ambari")); } String ambariGpgKeyUrl = request.getAmbariGpgKeyUrl(); if (isNotEmpty(ambariGpgKeyUrl)) { result.setAmbariGpgKeyUrl(isAccessible(ambariGpgKeyUrl, null)); } String stackBaseURL = request.getStackBaseURL(); if (isNotEmpty(stackBaseURL)) { result.setStackBaseURL(repoUrlAvailable(stackBaseURL, "HDP")); } String utilsBaseURL = request.getUtilsBaseURL(); if (isNotEmpty(utilsBaseURL)) { result.setUtilsBaseURL(repoUrlAvailable(utilsBaseURL, "HDP-UTILS")); } String versionDefinitionFileUrl = request.getVersionDefinitionFileUrl(); if (isNotEmpty(versionDefinitionFileUrl)) { result.setVersionDefinitionFileUrl(isAccessible(versionDefinitionFileUrl, null)); } String mpackUrl = request.getMpackUrl(); if (isNotEmpty(mpackUrl)) { result.setMpackUrl(isAccessible(mpackUrl, null)); } } return result; }  RepoConfigValidationV4Response validate(RepoConfigValidationV4Request request);  }### Answer:
@Test public void testValidateForRequestsIsNull() { RepoConfigValidationV4Response result = underTest.validate(null); assertNull(result.getAmbariBaseUrl()); assertNull(result.getAmbariGpgKeyUrl()); assertNull(result.getVersionDefinitionFileUrl()); assertNull(result.getMpackUrl()); assertNull(result.getStackBaseURL()); assertNull(result.getUtilsBaseURL()); }
@Test public void testValidateForRequestsWithNullValuedFields() { RepoConfigValidationV4Request request = new RepoConfigValidationV4Request(); RepoConfigValidationV4Response result = underTest.validate(request); assertNull(result.getAmbariBaseUrl()); assertNull(result.getAmbariGpgKeyUrl()); assertNull(result.getVersionDefinitionFileUrl()); assertNull(result.getMpackUrl()); assertNull(result.getStackBaseURL()); assertNull(result.getUtilsBaseURL()); }