unit tests for provides()

src/klein/test/test_attrs_zope.py

@@ -0,0 +1,35 @@
+from __future__ import annotations
+
+import attrs
+from zope.interface import Interface, implementer
+
+from twisted.trial.unittest import SynchronousTestCase
+
+from .._attrs_zope import provides
+
+
+class IWhatever(Interface):
+    ...
+
+
+@implementer(IWhatever)
+class YesWhatever:
+    ...
+
+
+class NoWhatever:
+    ...
+
+
+@attrs.define()
+class WhateverContainer:
+    whatever: object = attrs.field(validator=provides(IWhatever))
+
+
+class ProvidesTestCase(SynchronousTestCase):
+    def test_yes(self) -> None:
+        WhateverContainer(YesWhatever())
+
+    def test_no(self) -> None:
+        with self.assertRaises(TypeError):
+            WhateverContainer(NoWhatever())