More specific raise reason

test.py

@@ -1,3 +1,4 @@
+from argparse import ArgumentError, ArgumentTypeError
 import unittest
 from typing import List
 
@@ -14,23 +15,21 @@ class TestArgClass(unittest.TestCase):
 
         assert A.parse_args(['--arg1', 'hello']) == A(arg1='hello')
 
-    @unittest.expectedFailure
     def test__required_argument_missing(self):
 
         @argclass
         class A:
             arg1: str
 
-        A.parse_args([])
+        self.assertRaises(SystemExit, A.parse_args, [])
 
-    @unittest.expectedFailure
     def test__required_argument_wrong_given(self):
 
         @argclass
         class A:
             arg1: str
 
-        A.parse_args(['--arg2', 'hello'])
+        self.assertRaises(SystemExit, A.parse_args, ['--arg2', 'hello'])
 
     def test__optional_argument_missing(self):
 
@@ -48,14 +47,13 @@ class TestArgClass(unittest.TestCase):
 
         assert A.parse_args(['--arg2', 'welt']) == A(arg2='welt')
 
-    @unittest.expectedFailure
     def test__optional_argument_wrong_given(self):
 
         @argclass
         class A:
             arg2: str = 'world'
 
-        A.parse_args(['--arg3', 'welt'])
+        self.assertRaises(SystemExit, A.parse_args, ['--arg3', 'welt'])
 
     def test__boolean_true(self):
 
@@ -81,14 +79,13 @@ class TestArgClass(unittest.TestCase):
 
         assert A.parse_args(['--arg4', '42']) == A(arg4=42)
 
-    @unittest.expectedFailure
     def test__int_malformed(self):
 
         @argclass
         class A:
             arg4: int
 
-        A.parse_args(['--arg4', '4e2'])
+        self.assertRaises(SystemExit, A.parse_args, ['--arg4', '4e2'])
 
     def test__list(self):