MFTF + tests — which AI generates the best Magento tests?

Claude Code, by a clear margin. The reasons map directly to its strengths:

• MFTF (Magento Functional Test Framework): XML-heavy, needs precise selectors, must match the actual UI of the page. Claude Code reads the layout XML, the phtml templates, and the existing MFTF tests — produces selectors that actually work. Cursor often misses the layout chain; Copilot guesses selectors and fails ~50% of the time.
• PHPUnit (unit + integration tests): Claude Code reads the existing test base classes, finds the right fixture pattern, generates tests that follow project conventions. Cursor does well in workspace; Copilot is hit-or-miss on Magento-specific patterns.
• Cypress / Playwright (E2E): all three are competent here — these frameworks have lots of training data. Pick whichever your team prefers.

Common Magento testing workflow with Claude Code:

1. “Read this controller and generate a PHPUnit test that covers the happy path + 2 error cases.”
2. “Now generate the MFTF test for the storefront flow.”
3. “Run them, fix any failures.”

15 minutes per controller, instead of 1 – 2 hours by hand. This is where the metered API cost pays for itself fast.