Helpful PHPUnit helpers

helpers.php

<?php

trait HelpersTrait
{
    /**
     * Execute a callback with a custom error handler for the life of the callback.
     *
     * This is useful to suppress targeted PHP errors/warnings/notices.
     *
     * The error handler should return true to suppress an error, false to trigger
     * the default PHP handler or null to defer to the previously registered error
     * handler.
     *
     * @template TResult
     *
     * @param callable(int,string,?string,?int,array<mixed>):?bool $errorHandler
     * @param \Closure():TResult                                   $callback
     *
     * @return \Closure():TResult
     */
    private static function withErrorHandler(callable $errorHandler, \Closure $callback): mixed
    {
        $currentHandler = \get_error_handler();

        \set_error_handler(function (int $code, string $message, ?string $file, ?int $line, array $context = []) use ($currentHandler, $errorHandler): bool {
            $result = $errorHandler($code, $message, $file, $line, $context);

            if ($result === null) {
                if ($currentHandler === null) {
                    return false;
                }

                return $currentHandler($code, $message, $file, $line, $context);
            }

            return $result;
        }, \E_ALL);

        try {
            return $callback();
        } finally {
            \restore_error_handler();
        }
    }

    /**
     * Execute a given callback so that it runs with Zend assertions disabled.
     *
     * @template TReturn
     *
     * @param \Closure():TReturn $callback
     *
     * @return TReturn
     */
    private static function withoutZendAssertions(\Closure $callback): mixed
    {
        // When zend assertions are disabled (as opposed to inactive) then
        // there is nothing to do.
        if (\ini_get('zend.assertions') === '-1') {
            return $callback();
        }

        $oldValue = ini_set('zend.assertions', '0');

        try {
            return $callback();
        } finally {
            ini_set('zend.assertions', $oldValue);
        }
    }
  }