public function toThrow()

in src/ExpectObj.hack [569:591]

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

  public function toThrow<TException as \Throwable, TRet>(
    classname<TException> $exception_class,
    ?string $expected_exception_message = null,
    ?string $msg = null,
    mixed ...$args
  ): TException where T = (function(): TRet) {
    $msg = \vsprintf($msg ?? '', $args);
    $exception = $this->tryCallReturnException($exception_class);

    if (!$exception) {
      throw new \Exception(
        $msg.': Expected exception '.$exception_class." wasn't thrown",
      );
    }

    if ($expected_exception_message !== null) {
      $message = $exception->getMessage();

      $this->assertContains($expected_exception_message, $message, $msg);
    }

    return $exception;
  }