Fix he_pm variable name in tests for property access

Author: pirate

testing/test_pluginmanager.py

@@ -129,7 +129,7 @@ def test_register_skips_properties(he_pm: PluginManager) -> None:
     class A:
         @property
         def some_func(self):
-            pass
+            property_was_executed = True
 
     a = A()
     he_pm.register(a)
@@ -148,7 +148,7 @@ def some_attr(self): ...
 
     a = A()
     pname = he_pm.register(a)
-    assert not pm.get_hookcallers(pm.get_plugin(pname))
+    assert not he_pm.get_hookcallers(he_pm.get_plugin(pname))
 
 
 def test_register_mismatch_method(he_pm: PluginManager) -> None: