Document test suite in CLAUDE.md

Add Testing section so Claude knows to run ./tests/test_forms.sh
after making changes to verify all forms work correctly.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CLAUDE.md

@@ -181,6 +181,22 @@ PCs are in the machines table, identified by:
 - **API Token:** *(add token here if needed)*
 - **Repo:** `cproudlock/shopdb`
 
+## Testing
+
+### Run Form Tests
+After making changes to ASP pages, run the test suite to verify all forms work:
+```bash
+./tests/test_forms.sh
+```
+
+**Tests 41 endpoints:** page loads, add forms, create operations (notifications, equipment, printers, subnets, applications, KB articles, vendors, models, network devices), and API endpoints.
+
+**Cleanup test data:**
+```bash
+docker exec dev-mysql mysql -u root -prootpassword shopdb -e "DELETE FROM notifications WHERE notification LIKE 'AUTOTEST_%';"
+# (similar for other tables - see tests/cleanup_test_data.sql)
+```
+
 ## Quick Reference
 
 ### Start Dev Environment