pkg crypto/tls, method (*Dialer) Dial(string, string) (net.Conn, error)
pkg crypto/tls, method (*Dialer) DialContext(context.Context, string, string) (net.Conn, error)
pkg crypto/tls, method (ClientAuthType) String() string
pkg crypto/tls, method (CurveID) String() string
pkg crypto/tls, method (SignatureScheme) String() string
pkg crypto/tls, type Config struct, VerifyConnection func(ConnectionState) error
pkg crypto/tls, type Dialer struct

        CrawlerSystemException exception1 = new CrawlerSystemException(exceptionCause);
        assertSame(exceptionCause, exception1.getCause());

        // With Error cause
        Error errorCause = new Error("Error cause");
        CrawlerSystemException exception2 = new CrawlerSystemException(errorCause);
        assertSame(errorCause, exception2.getCause());

        // With RuntimeException cause

)

func init() {
	var err error
	if DB, err = OpenTestConnection(&gorm.Config{}); err != nil {
		log.Printf("failed to connect database, got error %v", err)
		os.Exit(1)
	} else {
		sqlDB, err := DB.DB()
		if err != nil {
			log.Printf("failed to connect database, got error %v", err)
			os.Exit(1)
		}

		err = sqlDB.Ping()
		if err != nil {

        Exception middleCause = new RuntimeException("Runtime error", innerCause);
        WebApiException exception = new WebApiException(400, middleCause);

        assertEquals(400, exception.getStatusCode());
        assertEquals("Runtime error", exception.getMessage());
        assertEquals(middleCause, exception.getCause());

        };
    addCallback(f, callback, directExecutor());
    f.cancel(true);
  }

  public void testThrowErrorFromGet() {
    Error error = new AssertionError("ASSERT!");
    ListenableFuture<String> f = UncheckedThrowingFuture.throwingError(error);
    MockCallback callback = new MockCallback(error);
    addCallback(f, callback, directExecutor());
  }

  public void testRuntimeExceptionFromGet() {

```

Digamos que ahora el archivo `main.py` con tu aplicación de **FastAPI** tiene algunas otras **path operations**.

Tiene una operación `GET` que podría devolver un error.

Tiene una operación `POST` que podría devolver varios errores.

Ambas *path operations* requieren un `X-Token` header.

//// tab | Python 3.10+

```Python
{!> ../../docs_src/app_testing/app_b_an_py310/main.py!}
```

////

func (z *BatchJobSize) DecodeMsg(dc *msgp.Reader) (err error) {
	{
		var zb0001 int64
		zb0001, err = dc.ReadInt64()
		if err != nil {
			err = msgp.WrapError(err)
			return
		}
		(*z) = BatchJobSize(zb0001)
	}
	return
}

// EncodeMsg implements msgp.Encodable
func (z BatchJobSize) EncodeMsg(en *msgp.Writer) (err error) {
	err = en.WriteInt64(int64(z))
	if err != nil {

// the directory itself, if the dirPath doesn't exist this function doesn't return
// an error.
func readDirFn(dirPath string, filter func(name string, typ os.FileMode) error) error {
	d, err := Open(dirPath)
	if err != nil {
		if osErrToFileErr(err) == errFileNotFound {
			return nil
		}
		return osErrToFileErr(err)
	}
	defer d.Close()

	maxEntries := 1000
	for {
		// Read up to max number of entries.

        in 100..199 -> "Informational"
        in 200..299 -> "OK"
        in 300..399 -> "Redirection"
        in 400..499 -> "Client Error"
        in 500..599 -> "Server Error"
        else -> "Mock Response"
      }
    return apply { status = "HTTP/1.1 $code $reason" }
  }

  fun clearHeaders() =
    apply {
      headersBuilder = Headers.Builder()
    }

  fun addHeader(header: String) =

    }

    /**
     * Handle channel failure
     *
     * @param failedChannel failed channel
     * @param error error that caused failure
     */
    public void handleFailure(ChannelInfo failedChannel, Exception error) {
        log.warn("Channel {} failed: {}", failedChannel.getChannelId(), error.getMessage());

        // Mark channel as failed
        failedChannel.setState(ChannelState.FAILED);