Make sure the monkeypatch fixture completion works

jedi/plugins/pytest.py

@@ -5,6 +5,10 @@ from jedi.inference.imports import load_module_from_path
 from jedi.inference.filters import ParserTreeFilter
 from jedi.inference.base_value import NO_VALUES, ValueSet
 
+_PYTEST_FIXTURE_MODULES = [
+    ('_pytest', 'monkeypatch')
+]
+
 
 def execute(callback):
     def wrapper(value, arguments):
@@ -110,6 +114,10 @@ def _iter_pytest_modules(module_context):
             pass
         folder = folder.get_parent_folder()
 
+    for names in _PYTEST_FIXTURE_MODULES:
+        for module_value in module_context.inference_state.import_module(names):
+            yield module_value.as_context()
+
 
 class FixtureFilter(ParserTreeFilter):
     def _filter(self, names):

test/completion/pytest.py

@@ -116,3 +116,16 @@ def lala(my_con
 #? 15 ['my_conftest_fixture']
 def lala(my_con):
     return
+
+# -----------------
+# pytest owned fixtures
+# -----------------
+
+#? ['monkeypatch']
+def test_p(monkeyp
+
+
+#! 15 ['def monkeypatch']
+def test_p(monkeypatch):
+    #? ['setattr']
+    monkeypatch.setatt