##### SUMMARY
Customer request: When typing the string to encrypt, it shows up as plain text. Since the string is being encrypted, it's safe to assume that it's sensitive (e.g. passwords) and should therefore be hidden. At the very least, maybe this could be a command line option. If it is hidden, I'd prefer to be forced to enter it twice to avoid mismatch. To mitigate this issue, I am currently using "stty -echo", but that shouldn't be necessary.

##### ISSUE TYPE
- Feature Idea

##### COMPONENT NAME
ansible-vault
def setUp(self):
        self.tty_patcher = patch('ansible.cli.sys.stdin.isatty', return_value=False)
        self.mock_isatty = self.tty_patcher.start()
    def tearDown(self):
        self.tty_patcher.stop()
    def test_parse_empty(self):
        cli = VaultCLI(['vaultcli'])
        self.assertRaises(SystemExit,
                          cli.parse)
    
    
    
    
    def test_parse_view_file(self):
        cli = VaultCLI(args=['ansible-vault', 'view', '/dev/null/foo'])
        cli.parse()
    @patch('ansible.cli.vault.VaultCLI.setup_vault_secrets')
    def test_view_missing_file_no_secret(self, mock_setup_vault_secrets):
        mock_setup_vault_secrets.return_value = []
        cli = VaultCLI(args=['ansible-vault', 'view', '/dev/null/foo'])
        cli.parse()
        self.assertRaisesRegexp(errors.AnsibleOptionsError,
                                "A vault password is required to use Ansible's Vault",
                                cli.run)
    @patch('ansible.cli.vault.VaultCLI.setup_vault_secrets')
    def test_encrypt_missing_file_no_secret(self, mock_setup_vault_secrets):