use Once;
static INIT: Once = new;
/// Initialize test environment once for all tests
/// This ensures tests can run in parallel without interference
///
/// # Safety
/// This function uses `std::env::set_var` in a `Once::call_once` block,
/// which is safe because:
/// - It only runs once at the start of the test suite
/// - These are test configuration variables, not being tested themselves
/// - The Once guard ensures no race conditions during initialization
/// - These environment variables configure the test environment globally