class TestErrorHandler

final class TestErrorHandler {
    
    /**
     * @param \Drupal\TestTools\ErrorHandler\BootstrapErrorHandler $parentHandler
     *   The parent error handler.
     * @param \PHPUnit\Framework\TestCase $testCase
     *   The test case being executed.
     */
    public function __construct(BootstrapErrorHandler $parentHandler, TestCase $testCase) {
    }
    
    /**
     * Executes when the object is called as a function.
     *
     * @param int $errorNumber
     *   The level of the error raised.
     * @param string $errorString
     *   The error message.
     * @param string $errorFile
     *   The filename that the error was raised in.
     * @param int $errorLine
     *   The line number the error was raised at.
     *
     * @return bool
     *   TRUE to stop error handling, FALSE to let the normal error handler
     *   continue.
     */
    public function __invoke(int $errorNumber, string $errorString, string $errorFile, int $errorLine) : bool {
        if (!DeprecationHandler::isEnabled()) {
            throw new \RuntimeException(__METHOD__ . '() must not be called if the deprecation handler is not enabled.');
        }
        // We are within a test execution. If we have a deprecation and the test is
        // a deprecation test, than we just collect the deprecation and return to
        // execution, since deprecations are expected.
        if ((E_USER_DEPRECATED === $errorNumber || E_DEPRECATED === $errorNumber) && DeprecationHandler::isDeprecationTest($this->testCase)) {
            $prefix = error_reporting() & $errorNumber ? 'Unsilenced deprecation: ' : '';
            DeprecationHandler::collectActualDeprecation($prefix . $errorString);
            return TRUE;
        }
        // In all other cases (errors, warnings, deprecations in normal tests), we
        // fall back to the parent error handler, which is the one that was
        // registered in the test runner bootstrap (BootstrapErrorHandler).
        call_user_func($this->parentHandler, $errorNumber, $errorString, $errorFile, $errorLine);
        return TRUE;
    }

}