GessoOpenAPI contract testing for PHP

PHPUnit coverage, request and response validation, fuzzing, and drift detection for Laravel, Symfony, Pest, PSR-7, or plain PHP.

Choose a quickstart

Contract enforcement

Validate requests and responses with OpenAPI 3.0, 3.1, and 3.2 semantics.

Visible coverage

See untested operations, statuses, and content types in PHPUnit and CI.

Framework choice

Use dedicated Laravel, Symfony, Pest, and PSR-7 adapters or the framework-independent core.

Five-minute path

Install the package, select the quickstart matching your test stack, and reach one passing contract assertion with a coverage report:

Every example is installed and executed in this repository's CI.