Implemented dictionnary based file system to speed up the tests

tests/test_PyhtonEvaluator.py

@@ -1,7 +1,4 @@
 import pytest
-import shutil
-from os import path
-import os
 
 from core.builtin_concepts import ReturnValueConcept, ParserResultConcept
 from core.sheerka import Sheerka, ExecutionContext
@@ -9,27 +6,10 @@ from core.concept import Concept
 from evaluators.PythonEvaluator import PythonEvaluator
 from parsers.PythonParser import PythonNode, PythonParser
 
-tests_root = path.abspath("../build/tests")
-root_folder = "init_folder"
-
-
-@pytest.fixture(autouse=True)
-def init_test():
-    if path.exists(tests_root):
-        shutil.rmtree(tests_root)
-
-    if not path.exists(tests_root):
-        os.makedirs(tests_root)
-    current_pwd = os.getcwd()
-    os.chdir(tests_root)
-
-    yield None
-    os.chdir(current_pwd)
-
 
 def get_context():
     sheerka = Sheerka()
-    sheerka.initialize(root_folder)
+    sheerka.initialize("mem://")
     return ExecutionContext("test", "xxx", sheerka)