Implemented dictionnary based file system to speed up the tests

tests/test_builtin_helpers.py

@@ -1,31 +1,7 @@
-import shutil
-from os import path
-import os
-
-import pytest
-
 from core.builtin_concepts import ReturnValueConcept, BuiltinConcepts
 from core.sheerka import Sheerka, ExecutionContext
 import core.builtin_helpers
 
-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 test_i_can_use_expect_one_when_empty():
     sheerka = get_sheerka()
@@ -136,7 +112,7 @@ def test_i_can_use_expect_one_when_not_a_list_false():
 
 def get_sheerka():
     sheerka = Sheerka()
-    sheerka.initialize(root_folder)
+    sheerka.initialize("mem://")
 
     return sheerka