First commands with basic structure.

- Moves DBManager to common.

test/common/unit/conftest.py

@@ -1,5 +1,8 @@
 import pytest
 import random
+from shutil import rmtree
+
+from common.db_manager import DBManager
 
 
 @pytest.fixture(scope="session", autouse=True)
@@ -7,6 +10,17 @@ def prng_seed():
     random.seed(0)
 
 
+@pytest.fixture(scope="module")
+def db_manager():
+    manager = DBManager("test_db")
+    # Add last know block for the Responder in the db
+
+    yield manager
+
+    manager.db.close()
+    rmtree("test_db")
+
+
 def get_random_value_hex(nbytes):
     pseudo_random_value = random.getrandbits(8 * nbytes)
     prv_hex = "{:x}".format(pseudo_random_value)