Fix for failing assertion on native modules Issue #1354 (#1370)

test/test_api/test_interpreter.py

@@ -8,7 +8,7 @@ import pytest
 import jedi
 from jedi._compatibility import is_py3, py_version
 from jedi.evaluate.compiled import mixed
-
+from importlib import import_module
 
 if py_version > 30:
     def exec_(source, global_map):
@@ -439,3 +439,9 @@ def test__wrapped__():
     c, = jedi.Interpreter('syslogs_to_df', [locals()]).completions()
     # Apparently the function starts on the line where the decorator starts.
     assert c.line == syslogs_to_df.__wrapped__.__code__.co_firstlineno + 1
+
+@pytest.mark.parametrize('module_name', ['sys', 'time'])
+def test_core_module_completes(module_name):
+    module = import_module(module_name)
+    assert jedi.Interpreter(module_name + '.\n', [locals()]).completions()
+