diff --git a/flaschengeist/app.py b/flaschengeist/app.py
index ad44085..1a80aa0 100644
--- a/flaschengeist/app.py
+++ b/flaschengeist/app.py
@@ -71,7 +71,7 @@ def install_all():
             roleController.create_permissions(plugin.permissions)
 
 
-def create_app():
+def create_app(test_config=None):
     app = Flask(__name__)
     app.json_encoder = CustomJSONEncoder
     CORS(app)
@@ -79,7 +79,7 @@ def create_app():
     with app.app_context():
         from flaschengeist.database import db
 
-        configure_app(app)
+        configure_app(app, test_config)
         db.init_app(app)
         __load_plugins(app)
 
diff --git a/flaschengeist/config.py b/flaschengeist/config.py
index 1ae840f..e8726c6 100644
--- a/flaschengeist/config.py
+++ b/flaschengeist/config.py
@@ -8,33 +8,44 @@ from werkzeug.middleware.proxy_fix import ProxyFix
 from flaschengeist import _module_path, logger
 
 
-def __update(d, u):
+# Default config:
+config = {}
+
+
+def update_dict(d, u):
     for k, v in u.items():
         if isinstance(v, collections.abc.Mapping):
-            d[k] = __update(d.get(k, {}), v)
+            d[k] = update_dict(d.get(k, {}), v)
         else:
             d[k] = v
     return d
 
 
-# Default config:
-config = {}
+def read_configuration():
+    global config
 
-__paths = [_module_path, Path.home() / ".config"]
-if "FLASCHENGEIST_CONF" in os.environ:
-    __paths.append(Path(os.environ.get("FLASCHENGEIST_CONF")))
-for loc in __paths:
-    try:
-        with (loc / "flaschengeist.toml").open() as source:
-            logger.info("Reading config file from >{}<".format(loc))
-            __update(config, toml.load(source))
-    except IOError:
-        pass
-# Always enable this builtin plugins!
-__update(config, {"auth": {"enabled": True}, "roles": {"enabled": True}, "users": {"enabled": True}})
+    paths = [_module_path, Path.home() / ".config"]
+    if "FLASCHENGEIST_CONF" in os.environ:
+        paths.append(Path(os.environ.get("FLASCHENGEIST_CONF")))
+
+    for loc in paths:
+        try:
+            with (loc / "flaschengeist.toml").open() as source:
+                print("Reading config file from >{}<".format(loc))
+                update_dict(config, toml.load(source))
+        except IOError:
+            pass
 
 
-def configure_app(app):
+def configure_app(app, test_config=None):
+    global config
+    if test_config is None:
+        read_configuration()
+    else:
+        update_dict(config, test_config)
+    # Always enable this builtin plugins!
+    update_dict(config, {"auth": {"enabled": True}, "roles": {"enabled": True}, "users": {"enabled": True}})
+
     logger_config = toml.load(_module_path / "logging.toml")
     if "LOGGING" in config:
         if "level" in config["LOGGING"]:
@@ -52,12 +63,15 @@ def configure_app(app):
     else:
         app.config["SECRET_KEY"] = config["FLASCHENGEIST"]["secret_key"]
 
-    app.config["SQLALCHEMY_DATABASE_URI"] = "mysql://{user}:{passwd}@{host}/{database}".format(
-        user=config["DATABASE"]["user"],
-        passwd=config["DATABASE"]["password"],
-        host=config["DATABASE"]["host"],
-        database=config["DATABASE"]["database"],
-    )
+    if test_config is None:
+        app.config["SQLALCHEMY_DATABASE_URI"] = "mysql://{user}:{passwd}@{host}/{database}".format(
+            user=config["DATABASE"]["user"],
+            passwd=config["DATABASE"]["password"],
+            host=config["DATABASE"]["host"],
+            database=config["DATABASE"]["database"],
+        )
+    else:
+        app.config["SQLALCHEMY_DATABASE_URI"] = f"sqlite+pysqlite://{config['DATABASE']['file_path']}"
     app.config["SQLALCHEMY_TRACK_MODIFICATIONS"] = False
 
     if "root" in config["FLASCHENGEIST"]:
diff --git a/setup.py b/setup.py
index d97177b..97d3100 100644
--- a/setup.py
+++ b/setup.py
@@ -21,7 +21,7 @@ setup(
         # Needed for python < 3.7
         "backports-datetime-fromisoformat",
     ],
-    extras_require={"ldap": ["flask_ldapconn", "ldap3"]},
+    extras_require={"ldap": ["flask_ldapconn", "ldap3"], "tests": ["pytest"]},
     entry_points={
         "flaschengeist.plugin": [
             # Authentication providers
diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 0000000..0c0931b
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,28 @@
+import os
+import tempfile
+import pytest
+
+from flaschengeist.app import create_app, install_all
+
+
+@pytest.fixture
+def app():
+    db_fd, db_path = tempfile.mkstemp()
+    app = create_app(
+        {
+            "TESTING": True,
+            "DATABASE": {"file_path": f"/{db_path}"},
+            "FLASCHENGEIST": {"auth": "auth_plain"},
+            "auth_plain": {"enabled": True},
+        }
+    )
+    with app.app_context():
+        install_all()
+    yield app
+    os.close(db_fd)
+    os.unlink(db_path)
+
+
+@pytest.fixture
+def client(app):
+    return app.test_client()
diff --git a/tests/test_auth.py b/tests/test_auth.py
new file mode 100644
index 0000000..6dcf468
--- /dev/null
+++ b/tests/test_auth.py
@@ -0,0 +1,16 @@
+import pytest
+
+# with app.app_context():
+#    engine = database.db.engine
+#    with engine.connect() as connection:
+#        connection.execute("")
+
+
+def test_login_decorator(client):
+    """Testing the login_required decorator"""
+    # No header at all
+    assert client.get("/auth").status_code == 401
+    # Invalid header
+    assert client.get("/auth", headers={"Authorization": "INVALID"}).status_code == 401
+    # Invalid Token
+    assert client.get("/auth", headers={"Authorization": "Bearer INVALID"}).status_code == 401