private function tryCallReturnException()

in src/ExpectObj.hack [656:679]

• 21 lines of code
• 3 McCabe index (conditional complexity)

  private function tryCallReturnException<Tclass as \Throwable>(
    classname<Tclass> $expected_exception_type,
  ): ?Tclass where T as (function(): mixed) {
    try {
      $callable = $this->var;
      $returned = $callable();

      if ($returned is Awaitable<_>) {
        /* HHAST_IGNORE_ERROR[DontUseAsioJoin] */
        \HH\Asio\join($returned);
      }
    } catch (\Exception $e) {
      $e = expect($e)->toBeInstanceOf(
        $expected_exception_type,
        'Expected to throw "%s", but instead got <%s> with message "%s"',
        $expected_exception_type,
        \get_class($e),
        $e->getMessage(),
      );
      return $e;
    }

    return null;
  }