diff --git a/pkgs/development/python-modules/flask/default.nix b/pkgs/development/python-modules/flask/default.nix
index 760c3ee671ae..556cbe5f3a31 100644
--- a/pkgs/development/python-modules/flask/default.nix
+++ b/pkgs/development/python-modules/flask/default.nix
@@ -10,6 +10,11 @@
 , werkzeug
 , pytestCheckHook
 , pythonOlder
+  # used in passthru.tests
+, flask-limiter
+, flask-restful
+, flask-restx
+, moto
 }:
 
 buildPythonPackage rec {
@@ -35,6 +40,10 @@ buildPythonPackage rec {
     pytestCheckHook
   ];
 
+  passthru.tests = {
+    inherit flask-limiter flask-restful flask-restx moto;
+  };
+
   meta = with lib; {
     homepage = "https://flask.palletsprojects.com/";
     description = "The Python micro framework for building web applications";