diff --git a/pkgs/development/python-modules/afdko/default.nix b/pkgs/development/python-modules/afdko/default.nix
index 7dd2fa9287fd..d9610e9b9274 100644
--- a/pkgs/development/python-modules/afdko/default.nix
+++ b/pkgs/development/python-modules/afdko/default.nix
@@ -6,6 +6,9 @@
 , cmake
 , antlr4_9
 , pytestCheckHook
+# Enables some expensive tests, useful for verifying an update
+, runAllTests ? false
+, afdko
 }:
 
 buildPythonPackage rec {
@@ -68,7 +71,7 @@ buildPythonPackage rec {
     #   https://github.com/adobe-type-tools/afdko/issues/1418
     find tests -name layerinfo.plist -delete
   '';
-  disabledTests = [
+  disabledTests = lib.optionals (!runAllTests) [
     # Disable slow tests, reduces test time ~25 %
     "test_report"
     "test_post_overflow"
@@ -79,6 +82,10 @@ buildPythonPackage rec {
     "test_options"
   ];
 
+  passthru.tests = {
+    fullTestsuite = afdko.override { runAllTests = true; };
+  };
+
   meta = with lib; {
     description = "Adobe Font Development Kit for OpenType";
     homepage = "https://adobe-type-tools.github.io/afdko/";