// and as such incurred latencies.
var Discard io.Writer = discard{}

// discard is /dev/null for Golang.
type discard struct{}

func (discard) Write(p []byte) (int, error) {
	return len(p), nil
}

// DiscardReader discarded reader
func DiscardReader(r io.Reader) {
	Copy(Discard, r)

String run(String url) throws IOException {
  Request request = new Request.Builder()
      .url(url)
      .build();

  try (Response response = client.newCall(request).execute()) {
    return response.body().string();
  }
}
```


Post to a Server
----------------

This program posts data to a service. [Full source][post_example].

```java

        int len = clean.length();
        byte[] out = new byte[len / 2];
        for (int i = 0; i < len; i += 2) {
            out[i / 2] = (byte) Integer.parseInt(clean.substring(i, i + 2), 16);
        }
        return out;
    }

    @Test
    @DisplayName("getNTHash: known vector for 'password'")
    void testGetNTHash_knownVector() {
        // Arrange
        String password = "password";

In this case, you could want to document how that external API *should* look like. What *path operation* it should have, what body it should expect, what response it should return, etc.

## An app with callbacks { #an-app-with-callbacks }

Let's see all this with an example.

Imagine you develop an app that allows creating invoices.

import (
	"context"
	"fmt"
	"net/http"
	"net/url"
	"os"
	"testing"
	"time"
)

func niceError(code APIErrorCode) string {
	// Special-handle ErrNone
	if code == ErrNone {
		return "ErrNone"
	}

	return fmt.Sprintf("%s (%s)", errorCodes[code].Code, errorCodes[code].Description)
}

func TestDoesPolicySignatureMatch(t *testing.T) {
	_, fsDir, err := prepareFS(t.Context())
	if err != nil {
		t.Fatal(err)

  parsed_args = parser.parse_args()
  if not parsed_args.print and not parsed_args.xml_out_path:
    raise TypeError('`--print` or `--xml-out-path` must be specified')

  return parsed_args


def parse_log(file_path: str,
              verbose: bool = False) -> ResultDictType:
  """Finds ResultStore links, and tries to determine their status."""

                stopwords[i] = stopwords[i].toLowerCase(Locale.ROOT);
            }
        }
    }

    @Override
    public TokenStream create(final TokenStream tokenStream) {
        return new StopTokenPrefixFilter(tokenStream, stopwords, ignoreCase);
    }

        // Test the decode method
        long decodedValue = 112233445566778L;
        NdrHyper ndrHyper = new NdrHyper(0); // Initialize with a dummy value

        // Configure the mock NdrBuffer to return a specific value when dec_ndr_hyper is called
        when(mockNdrBuffer.dec_ndr_hyper()).thenReturn(decodedValue);

        // Call the decode method with the mocked NdrBuffer
        ndrHyper.decode(mockNdrBuffer);

    }

    /**
     * Executes a script with the specified script type and content.
     *
     * @param scriptType the type of script to execute
     * @param script the script content to execute
     * @return the result of script execution
     */
    public abstract Object execute(String scriptType, String script);

    /**
     * Initiates shutdown of the job executor.

      Request request = chain.request();
      if (request.url().host().equals(host)) {
        request = request.newBuilder()
            .header("Authorization", credentials)
            .build();
      }
      return chain.proceed(request);
    }
  }