assertEquals(0, event.toSource().size());

        // Add elements to the map
        map1.put("key1", "value1");
        assertEquals(1, event.toSource().size());

        // Replace the map
        Map<String, Object> map2 = new HashMap<>();
        map2.put("key2", "value2");
        map2.put("key3", "value3");
        event.setSourceMap(map2);
        assertEquals(2, event.toSource().size());

///

## Duplicate headers { #duplicate-headers }

It is possible to receive duplicate headers. That means, the same header with multiple values.

You can define those cases using a list in the type declaration.

You will receive all the values from the duplicate header as a Python `list`.

For example, to declare a header of `X-Token` that can appear more than once, you can write:

            charset = charset,
          )
        values +=
          value.canonicalizeWithCharset(
            encodeSet = FORM_ENCODE_SET,
            alreadyEncoded = true,
            plusIsSpace = true,
            charset = charset,
          )
      }

      fun build(): FormBody = FormBody(names, values)
    }

  companion object {

@NullUnmarked
@AndroidIncompatible // test-suite builders
public class ShortArrayAsListTest extends TestCase {

  private static List<Short> asList(Short[] values) {
    short[] temp = new short[values.length];
    for (short i = 0; i < values.length; i++) {
      temp[i] = checkNotNull(values[i]); // checkNotNull for GWT (do not optimize).
    }
    return Shorts.asList(temp);
  }

  @J2ktIncompatible
  @GwtIncompatible // suite

@GwtCompatible
@NullUnmarked
@AndroidIncompatible // test-suite builders
public class LongArrayAsListTest extends TestCase {

  private static List<Long> asList(Long[] values) {
    long[] temp = new long[values.length];
    for (int i = 0; i < values.length; i++) {
      temp[i] = checkNotNull(values[i]); // checkNotNull for GWT (do not optimize).
    }
    return Longs.asList(temp);
  }

  @J2ktIncompatible
  @GwtIncompatible // suite

@NullUnmarked
@AndroidIncompatible // test-suite builders
public class ShortArrayAsListTest extends TestCase {

  private static List<Short> asList(Short[] values) {
    short[] temp = new short[values.length];
    for (short i = 0; i < values.length; i++) {
      temp[i] = checkNotNull(values[i]); // checkNotNull for GWT (do not optimize).
    }
    return Shorts.asList(temp);
  }

  @J2ktIncompatible
  @GwtIncompatible // suite

    }
    // add the intersection of CollectionFeature.values() and mapFeatures
    for (CollectionFeature feature : CollectionFeature.values()) {
      if (mapFeatures.contains(feature)) {
        derivedFeatures.add(feature);
      }
    }
    // add the intersection of CollectionSize.values() and mapFeatures
    for (CollectionSize size : CollectionSize.values()) {
      if (mapFeatures.contains(size)) {

        assertEquals("5", KerberosConstants.KERBEROS_VERSION, "KERBEROS_VERSION should have the correct value.");
        assertEquals(23, KerberosConstants.RC4_ENC_TYPE, "RC4_ENC_TYPE should have the correct value.");
        assertEquals("HmacMD5", KerberosConstants.HMAC_ALGORITHM, "HMAC_ALGORITHM should have the correct value.");
    }

{* ../../docs_src/query_params/tutorial001.py hl[9] *}

The query is the set of key-value pairs that go after the `?` in a URL, separated by `&` characters.

For example, in the URL:

```
http://127.0.0.1:8000/items/?skip=0&limit=10
```

...the query parameters are:

* `skip`: with a value of `0`
* `limit`: with a value of `10`

As they are part of the URL, they are "naturally" strings.

                field.setAccessible(true);
                String value = (String) field.get(null);
                assertFalse("Duplicate value found: " + value + " for field: " + field.getName(), values.contains(value));
                values.add(value);
            }
        }
    }

    /**
     * Test specific label constants exist and have correct values
     */
    public void test_specificLabelConstants() {