Some arguments are mutually exclusives

main.py

@@ -30,7 +30,7 @@ def create_arg_parser():
     parser.add_argument('-l', '--list', action='store_true',
                       help='list all supported fileformats')
 
-    info = parser.add_argument_group('Information')
+    info = parser.add_mutually_exclusive_group()
     info.add_argument('-c', '--check', action='store_true',
                       help='check if a file is free of harmful metadatas')
     info.add_argument('-s', '--show', action='store_true',

tests/test_climat2.py

@@ -8,12 +8,12 @@ class TestHelp(unittest.TestCase):
     def test_help(self):
         proc = subprocess.Popen(['./main.py', '--help'], stdout=subprocess.PIPE)
         stdout, _ = proc.communicate()
-        self.assertIn(b'usage: main.py [-h] [-v] [-c] [-l] [-s] [-L] [files [files ...]]', stdout)
+        self.assertIn(b'usage: main.py [-h] [-v] [-l] [-c | -s | -L] [files [files ...]]', stdout)
 
     def test_no_arg(self):
         proc = subprocess.Popen(['./main.py'], stdout=subprocess.PIPE)
         stdout, _ = proc.communicate()
-        self.assertIn(b'usage: main.py [-h] [-v] [-c] [-l] [-s] [-L] [files [files ...]]', stdout)
+        self.assertIn(b'usage: main.py [-h] [-v] [-l] [-c | -s | -L] [files [files ...]]', stdout)
 
 
 class TestVersion(unittest.TestCase):
@@ -23,6 +23,12 @@ class TestVersion(unittest.TestCase):
         self.assertTrue(stdout.startswith(b'MAT2 '))
 
 
+class TestExclusiveArgs(unittest.TestCase):
+    def test_version(self):
+        proc = subprocess.Popen(['./main.py', '-s', '-c'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+        stdout, stderr = proc.communicate()
+        self.assertIn(b'main.py: error: argument -c/--check: not allowed with argument -s/--show', stderr)
+
 
 class TestReturnValue(unittest.TestCase):
     def test_nonzero(self):