Implemented dictionnary based file system to speed up the tests

tests/test_PythonParser.py

@@ -1,37 +1,16 @@
 import ast
-import os
-import shutil
-from os import path
 
 import pytest
 
 from core.builtin_concepts import ParserResultConcept
 from core.sheerka import Sheerka, ExecutionContext
 from core.tokenizer import Tokenizer
-from parsers.BaseParser import BaseParser
 from parsers.PythonParser import PythonNode, PythonParser, PythonErrorNode
 
-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)