t465: test(form-manager): improve Form_Manager test coverage to ≥60%

[superdav42]

Summary

• Add 3 new tests covering previously untested code paths in Form_Manager
• test_security_checks_dies_for_non_ajax_request: covers the wp_die(0) path in security_checks() when HTTP_X_REQUESTED_WITH is absent
• test_security_checks_passes_for_valid_ajax_request: covers the pass-through path in security_checks() with valid AJAX context, registered form, and capable user
• test_default_bulk_action_handler_sends_error_when_process_fails: covers the wp_send_json_error() path in default_bulk_action_handler() when process_bulk_action() returns WP_Error (nonexistent model)

Coverage Results

Metric	Before	After	Target
Methods	56.25% (9/16)	62.50% (10/16)	≥60% ✓
Lines	79.06% (219/277)	81.23% (225/277)	≥60% ✓
Tests	40	43	—
Assertions	89	94	—

Note on remaining uncovered methods

display_form_unavailable(), display_form(), and handle_form() all terminate with bare die/exit (not wp_die()), making them untestable without process isolation. These are documented in the test file comments.

Runtime Testing

• Testing level: unit-tested
• Risk classification: Low (test files only, no production code modified)
• Dev environment: local WordPress test suite
• All 43 Form_Manager tests pass: OK (43 tests, 94 assertions)

Closes #559

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 786d7f8c-f74b-4096-abe8-f6e00640b753

📥 Commits

Reviewing files that changed from the base of the PR and between 29296ac and ab6ef74.

📒 Files selected for processing (2)

• TODO.md
• tests/WP_Ultimo/Managers/Form_Manager_Test.php

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/t465-form-manager-coverage

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[github-actions]

🔨 Build Complete - Ready for Testing!

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Download the zip build, upload to WordPress and test:

• Build: ultimate-multisite
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• ⬇️ Download without Github Account (nightly.link)

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Playground support for multisite is very limitied, hopefully it will get better in the future.

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[github-actions]

Performance Test Results

Performance test results for 49ab9df are in 🛎️!

URL: /

Run	DB Queries	Memory	Before Template	Template	WP Total	LCP	TTFB	LCP - TTFB
0	57	36.39 MB	306.00 ms	109.00 ms	415.50 ms	513.55 ms	429.90 ms	82.65 ms
1	57	36.39 MB	300.00 ms	105.00 ms	405.00 ms	500.30 ms	418.35 ms	82.20 ms