etesync-dav: add passthru.tests

pkgs/applications/misc/etesync-dav/default.nix

@@ -1,6 +1,7 @@
 { lib
 , stdenv
 , fetchpatch
+, nixosTests
 , python3
 , radicale3
 }:
@@ -71,6 +72,10 @@ in python.pkgs.buildPythonApplication rec {
 
   doCheck = false;
 
+  passthru.tests = {
+    inherit (nixosTests) etesync-dav;
+  };
+
   meta = with lib; {
     homepage = "https://www.etesync.com/";
     description = "Secure, end-to-end encrypted, and privacy respecting sync for contacts, calendars and tasks";