when(backingMap.putIfAbsent(eq(KEY), isA(AtomicInteger.class))).thenReturn(existing);

    // another map.get()
    when(backingMap.get(KEY)).thenReturn(existing);
    // we shouldn't see any more map operations; CHM will now just update the AtomicInteger

    assertEquals(12, multiset.add(KEY, 3));
    assertEquals(15, existing.get());
  }

  public void testRemove_zeroFromSome() {
    final int INITIAL_COUNT = 14;

Now use the parameter `callbacks` in *your API's path operation decorator* to pass the attribute `.routes` (that's actually just a `list` of routes/*path operations*) from that callback router:

```Python hl_lines="35"
{!../../docs_src/openapi_callbacks/tutorial001.py!}
```

/// tip

## Explore Further

- [MinIO Quickstart Guide](https://min.io/docs/minio/linux/index.html#quickstart-for-linux)

				"X-Amz-Date", "",
				"X-Amz-SignedHeaders", "",
			},
			expectedErrCode: ErrInvalidQueryParams,
		},
	}

	for i, testCase := range testCases {
		inputQuery := url.Values{}
		// iterating through input query key value and setting the inputQuery of type url.Values.
		for j := 0; j < len(testCase.inputQueryKeyVals)-1; j += 2 {
			inputQuery.Set(testCase.inputQueryKeyVals[j], testCase.inputQueryKeyVals[j+1])
		}

import java.io.Serializable;
import java.math.BigInteger;
import javax.annotation.CheckForNull;

/**
 * A wrapper class for unsigned {@code long} values, supporting arithmetic operations.
 *
 * <p>In some cases, when speed is more important than code readability, it may be faster simply to
 * treat primitive {@code long} values as unsigned, using the methods from {@link UnsignedLongs}.
 *

import java.io.Serializable;
import java.math.BigInteger;
import javax.annotation.CheckForNull;

/**
 * A wrapper class for unsigned {@code long} values, supporting arithmetic operations.
 *
 * <p>In some cases, when speed is more important than code readability, it may be faster simply to
 * treat primitive {@code long} values as unsigned, using the methods from {@link UnsignedLongs}.
 *

   * with the entries {@code (3, 5] => "foo", (6, 8) => "bar", (10, 12) => "baz"}.
   *
   * <p>The returned range map supports all optional operations that this range map supports, except
   * for {@code asMapOfRanges().iterator().remove()}.
   *
   * <p>The returned range map will throw an {@link IllegalArgumentException} on an attempt to

<img src="/img/tutorial/body/image03.png">

You also get error checks for incorrect type operations:

<img src="/img/tutorial/body/image04.png">

This is not by chance, the whole framework was built around that design.

<img src="/img/tutorial/body/image03.png">

Et vous obtenez aussi de la vérification d'erreur pour les opérations incorrectes de types :

<img src="/img/tutorial/body/image04.png">

Ce n'est pas un hasard, ce framework entier a été bâti avec ce design comme objectif.

This document focuses on showing a working example on how to use Object Lambda with MinIO, you must have [MinIO deployed in your environment](https://min.io/docs/minio/linux/operations/installation.html) before you can start using external lambda functions. You also must install Python version 3.8 or later for the lambda handlers to work.

## Example Lambda handler

Install the necessary dependencies.
```sh