### Question:
CSVFolder implements CSVObject { @Override public boolean isValid() { byte[] verify = this.capability.getVerificationKey(); byte[] fromServer = this.getPublicKeyHash(); int n = fromServer.length; if (verify.length != fromServer.length) { return false; } for (int i = 0; i < n; i++) { if (verify[i] != fromServer[i]) { return false; } } byte[] hash = Cryptoutil.hash(this.ciphertext, -1); return Cryptoutil.signature_valid(this.signature, hash, this.pubkey); } CSVFolder();  CSVFolder(Capability capability); void download(byte[] packet); void sign(); void encrypt(); @Override boolean isValid(); @Override Capability getCapability(); @Override void setCapability(Capability capability); Map<String, Capability> getContents(); void addContent(String alias, Capability capability); byte[] upload(); void createPlainText(); byte[] getPublicKeyHash(); public byte[] plainText; public boolean hack_do_not_create_plaintext; }### Answer:
@Test public void testSigningOfInitial() { testEncryption(); Assert.assertTrue(this.newFolder.isValid()); }