: Used to define options like timeouts , browser types (Chromium, Firefox), and the directory where test files are stored.
: Defines specific Jest configurations for unit and end-to-end (e2e) tests, such as headless mode for browsers or viewport dimensions. Relation to Rust's #[cfg(test)] test.cfg
While test.cfg is a standalone file, it is often confused with Rust's attribute. In Rust programming , this is a "conditional compilation" flag: Testing Config - Stencil.js : Used to define options like timeouts ,