### Question:
CsrFilenameCreator { public String createInternalCsrFilename() { return INTERNAL_CSR_FILE_PREFIX + createDateString() + INTERNAL_CSR_FILE_EXTENSION; }  String createCsrFilename(KeyUsageInfo keyUsageInfo, CertificateRequestFormat csrFormat,
            ClientId memberId, SecurityServerId securityServerId); String createInternalCsrFilename(); static final String INTERNAL_CSR_FILE_PREFIX; static final String INTERNAL_CSR_FILE_EXTENSION; }### Answer:
@Test public void createInternalCertCsrFilename() { String filename = csrFilenameCreator.createInternalCsrFilename(); assertEquals(INTERNAL_CSR_FILE_PREFIX + DATE + INTERNAL_CSR_FILE_EXTENSION, filename); }