Add cached_property hypothesis check.

Author: Danny Cooper

tests/strategies.py

@@ -3,7 +3,7 @@
 """
 Testing strategies for Hypothesis-based tests.
 """
-
+import functools
 import keyword
 import string
 
@@ -111,13 +111,19 @@ def simple_attrs_with_metadata(draw):
 
 simple_attrs = simple_attrs_without_metadata | simple_attrs_with_metadata()
 
+
 # Python functions support up to 255 arguments.
 list_of_attrs = st.lists(simple_attrs, max_size=3)
 
 
 @st.composite
 def simple_classes(
-    draw, slots=None, frozen=None, weakref_slot=None, private_attrs=None
+    draw,
+    slots=None,
+    frozen=None,
+    weakref_slot=None,
+    private_attrs=None,
+    cached_property=None,
 ):
     """
     A strategy that generates classes with default non-attr attributes.
@@ -157,6 +163,7 @@ class HypClass:
     pre_init_flag = draw(st.booleans())
     post_init_flag = draw(st.booleans())
     init_flag = draw(st.booleans())
+    cached_property_flag = draw(st.booleans())
 
     if pre_init_flag:
 
@@ -179,9 +186,20 @@ def init(self, *args, **kwargs):
 
         cls_dict["__init__"] = init
 
+    bases = (object,)
+    if cached_property or (cached_property is None and cached_property_flag):
+
+        class BaseWithCachedProperty:
+            @functools.cached_property
+            def _cached_property(self) -> int:
+                return 1
+
+        bases = (BaseWithCachedProperty,)
+
     return make_class(
         "HypClass",
         cls_dict,
+        bases=bases,
         slots=slots_flag if slots is None else slots,
         frozen=frozen_flag if frozen is None else frozen,
         weakref_slot=weakref_flag if weakref_slot is None else weakref_slot,

tests/test_3rd_party.py

@@ -19,7 +19,7 @@ class TestCloudpickleCompat:
     Tests for compatibility with ``cloudpickle``.
     """
 
-    @given(simple_classes())
+    @given(simple_classes(cached_property=False))
     def test_repr(self, cls):
         """
         attrs instances can be pickled and un-pickled with cloudpickle.