Make sure fixture resolving works in conftest.py, see #791

jedi/plugins/pytest.py

@@ -129,11 +129,12 @@ def _iter_pytest_modules(module_context, skip_own_module=False):
         sys_path = module_context.inference_state.get_sys_path()
         while any(folder.path.startswith(p) for p in sys_path):
             file_io = folder.get_file_io('conftest.py')
-            try:
-                m = load_module_from_path(module_context.inference_state, file_io)
-                yield m.as_context()
-            except FileNotFoundError:
-                pass
+            if file_io.path != module_context.py__file__():
+                try:
+                    m = load_module_from_path(module_context.inference_state, file_io)
+                    yield m.as_context()
+                except FileNotFoundError:
+                    pass
             folder = folder.get_parent_folder()
 
     for names in _PYTEST_FIXTURE_MODULES:

test/completion/conftest.py

@@ -20,3 +20,10 @@ def my_not_existing_fixture():
 @pytest.fixture()
 def inheritance_fixture():
     return ''
+
+
+@pytest.fixture
+def testdir(testdir):
+    #? ['chdir']
+    testdir.chdir
+    return testdir

test/run.py

@@ -206,7 +206,7 @@ class IntegrationTestCase(BaseTestCase):
             TEST_GOTO: self.run_goto,
             TEST_REFERENCES: self.run_find_references,
         }
-        if self.path.endswith('pytest.py') \
+        if (self.path.endswith('pytest.py') or self.path.endswith('conftest.py')) \
                 and environment.executable != os.path.realpath(sys.executable):
             # It's not guarantueed that pytest is installed in test
             # environments, if we're not running in the same environment that