Implement log_in_user

tests/conftest.py

@@ -16,10 +16,9 @@ def app(request):
     ctx = _app.app_context()
     ctx.push()
 
-    def teardown():
-        ctx.pop()
+    yield _app
 
-    return _app
+    ctx.pop()
 
 
 def apply_migrations():
@@ -34,9 +33,6 @@ def apply_migrations():
 @pytest.fixture(scope='session')
 def db(app, request):
 
-    def teardown():
-        _db.drop_all()
-
     _db.app = app
 
     apply_migrations()