testo

Migrate an existing PHPUnit (or Pest) test suite to Testo — via the Rector bridge, via AI-agent rewriting, or a combination. Use when the user says "migrate from PHPUnit", "port phpunit tests", "convert TestCase to Testo", or has files extending PHPUnit\Framework\TestCase that need to move to Testo's attribute-based style.

Set up or edit `testo.php` — the Testo application config. Use when the user is bootstrapping a project (including running `vendor/bin/testo init`), adding/removing a suite, scoping a finder, wiring an application-wide plugin (coverage, JUnit), or asking "where do I configure Testo" / "how do I initialize Testo".

Report and raise line coverage on a Testo project — collect coverage once, aggregate the Clover report into a ranked, LLM-friendly work-list, then optionally write tests for the least-covered files with subagents. Use both for read-only coverage questions and for improving coverage. Triggers are "increase coverage", "improve test coverage", "cover untested code", "find uncovered lines", "raise the coverage percentage", "what isn't tested", "what's our test coverage", "coverage status/report", "how well tested is X", "is X covered".

Write or modify tests in a project that uses the Testo PHP testing framework. Use when adding a

Author a Testo plugin — interceptors (middleware), event listeners, container bindings, custom attributes, or full test-environment provisioning. Use when the user wants to extend how Testo runs tests (wrap every test, provision a database/service, custom reporters, attribute-driven behaviour, integrating an external system) rather than writing a single test.

Write or tune Testo performance benchmarks with

Run mutation testing on a Testo project with Infection (via testo/bridge-infection), collect surviving mutants efficiently, and kill them by strengthening tests. Use when the user asks about "mutation testing", "infection", "MSI", "mutation score", "escaped mutants", "kill mutants", or wants to measure how good the tests really are.

Configure code coverage in Testo via CodecovPlugin, choose coverage level (Line/Branch/Path), wire up reports (Clover/Cobertura/PHPUnit XML), and use

Stabilize flaky Testo tests with

Parameterize Testo tests with

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