Use function-form of deprecated_call to comply with older pytest versions

nicoddemus · nicoddemus · commit dc6ae62f6f92 · 2017-08-30T20:53:55.000-03:00
diff --git a/testing/test_pluginmanager.py b/testing/test_pluginmanager.py
@@ -345,8 +345,7 @@ def m(self, __multicall__, x):
             assert not __multicall__.hook_impls
             return 17
 
-    with pytest.deprecated_call():
-        pm.register(P1())
+    pytest.deprecated_call(pm.register, P1())
 
 
 def test_add_hookspecs_nohooks(pm):
