Start replacing Script calls with a fixture

This is important to migrate all tests to specific fixtures.

conftest.py

@@ -1,6 +1,7 @@
 import tempfile
 import shutil
 import os
+from functools import partial
 
 import pytest
 
@@ -95,6 +96,11 @@ def environment(request):
     return get_python_environment('python%s.%s' % tuple(version))
 
 
+@pytest.fixture(scope='session')
+def Script(environment):
+    return partial(jedi.Script, environment=environment)
+
+
 @pytest.fixture(scope='session')
 def has_typing(environment):
     if environment.version_info >= (3, 5, 0):