Add test

Author: donbarbos

Lib/test/test_getpass.py

@@ -161,6 +161,32 @@ def test_falls_back_to_stdin(self):
             self.assertIn('Warning', stderr.getvalue())
             self.assertIn('Password:', stderr.getvalue())
 
+    def test_echochar_replaces_input_with_asterisks(self):
+        mock_result = '*************'
+        with mock.patch('os.open') as os_open, \
+                mock.patch('io.FileIO'), \
+                mock.patch('io.TextIOWrapper') as textio, \
+                mock.patch('termios.tcgetattr'), \
+                mock.patch('termios.tcsetattr'), \
+                mock.patch('getpass._input_with_echochar') as mock_input:
+            os_open.return_value = 3
+            mock_input.return_value = mock_result
+
+            result = getpass.unix_getpass(echochar='*')
+            mock_input.assert_called_once_with('Password: ', textio(), textio(), '*')
+            self.assertEqual(result, mock_result)
+
+    def test_input_with_echochar(self):
+        passwd = 'my1pa$$word!'
+        mock_input = StringIO(f'{passwd}\n')
+        mock_output = StringIO()
+        with mock.patch('sys.stdin', mock_input), \
+                mock.patch('sys.stdout', mock_output):
+            result = getpass._input_with_echochar('Password: ', mock_output,
+                                                  mock_input, '*')
+        self.assertEqual(result, passwd)
+        self.assertEqual('Password: ************', mock_output.getvalue())
+
 
 if __name__ == "__main__":
     unittest.main()