test(email): add parametrized ASCII control character cases

Author: lisdianara

tests/test_email_control_character.py

@@ -1,4 +1,4 @@
-"""HU-02: reject SOH in an address intended for SMTP (RFC 5321)."""
+"""HU-02: reject ASCII control characters in quoted SMTP local parts."""
 
 # external
 import pytest
@@ -7,12 +7,14 @@
 
 
 @pytest.mark.parametrize(
-    ("email",),
-    [
-        ('"user\x01name"@example.com', ),
-    ],
+    "control_code",
+        [1, 2, 7, 11, 12, 14, 27, 31, 127],
 )
-def test_email_rejects_soh_control_character(email: str):
-    """The Python escape introduces the actual ASCII SOH character."""
+
+def test_email_rejects_control_characters(control_code: int):
+    """Reject selected ASCII control characters in quoted local parts."""
+    email = f'"user{chr(control_code)}name"@example.com'
+
     result = validators.email(email)
-    assert isinstance(result, validators.ValidationError), repr(result)
+
+    assert isinstance(result, validators.ValidationError), repr(result)