Avoid execution of Jedi in test setup

This makes testing Jedi potentially faster.

test/test_api/test_classes.py

@@ -18,7 +18,8 @@ def test_is_keyword():
     assert len(results) == 1 and results[0].is_keyword is False
 
 
-def make_definitions():
+def test_basedefinition_type():
+    def make_definitions():
         """
         Return a list of definitions for parametrized tests.
 
@@ -60,8 +61,7 @@ def make_definitions():
         return definitions
 
 
-@pytest.mark.parametrize('definition', make_definitions())
-def test_basedefinition_type(definition):
+    for definition in make_definitions():
         assert definition.type in ('module', 'class', 'instance', 'function',
                                    'generator', 'statement', 'import', 'param')