Try filtering

Author: Katharine Hyatt

.github/workflows/Tests.yml

@@ -31,7 +31,7 @@ jobs:
           # Auto-discover test groups from all subdirectory names.
           groups=$(find test -mindepth 1 -maxdepth 1 -type d \
             | xargs -I{} basename {} | sort \
-            | jq -R -s -c '[split("\n")[] | select(length > 0)]')
+            | jq -R -s -c '[split("\n")[] | select(length > 0) | select(.!= "testsuite")]')
 
           echo "groups=${groups}" >> "$GITHUB_OUTPUT"