added system_tests

python/default.nix

@@ -0,0 +1,23 @@
+{ pkgs, ... }:
+{
+  environment.systemPackages = with pkgs; [
+    python313.withPackages
+    (
+      ps: with ps; [
+        apprise
+        apscheduler
+        mypy
+        polars
+        pyfakefs
+        pytest
+        pytest-cov
+        pytest-mock
+        pytest-xdist
+        requests
+        ruff
+        typer
+        types-requests
+      ]
+    )
+  ];
+}