Ignore invalid ContentType.__init__ params

We want to validate runtime behavior here.

Signed-off-by: Stephen Finucane <stephen@that.guru>

Author: stephenfin

tests/test_content_type.py

@@ -12,9 +12,10 @@
 class TestContentType(TestCase):
     def test___init___None_errors(self):
         raises_value_error = Raises(MatchesException(ValueError))
-        self.assertThat(lambda: ContentType(None, None), raises_value_error)
-        self.assertThat(lambda: ContentType(None, "traceback"), raises_value_error)
-        self.assertThat(lambda: ContentType("text", None), raises_value_error)
+        # intentionally passing invalid values to test runtime behavior
+        self.assertThat(lambda: ContentType(None, None), raises_value_error)  # type: ignore[arg-type]
+        self.assertThat(lambda: ContentType(None, "traceback"), raises_value_error)  # type: ignore[arg-type]
+        self.assertThat(lambda: ContentType("text", None), raises_value_error)  # type: ignore[arg-type]
 
     def test___init___sets_ivars(self):
         content_type = ContentType("foo", "bar")

testtools/content_type.py

@@ -12,6 +12,10 @@ class ContentType:
         content type.
     """
 
+    type: str
+    subtype: str
+    parameters: dict[str, str]
+
     def __init__(
         self, primary_type: str, sub_type: str, parameters: dict[str, str] | None = None
     ) -> None: