}
  }

  private static Method getJdkNextDown() throws Exception {
    try {
      return Math.class.getMethod("nextDown", double.class);
    } catch (NoSuchMethodException expectedBeforeJava8) {
      return Class.forName("sun.misc.FpUtils").getMethod("nextDown", double.class);
    }
  }

  @AndroidIncompatible // TODO(cpovirk): File bug for BigDecimal.doubleValue().
  public void testBigToDouble() {

        if (value == null || value.getClass() != String.class && destPropertyClass != null && destPropertyClass != String.class) {
            return value;
        }
        Converter converter = converterMap.get(destPropertyName);
        if (converter == null) {
            final Class<?> targetClass;
            if (value.getClass() != String.class) {

    ImmutableList.Builder<String> builder = ImmutableList.builder();
    assertThrows(NullPointerException.class, () -> builder.add((String) null));

    assertThrows(NullPointerException.class, () -> builder.add((String[]) null));

    assertThrows(NullPointerException.class, () -> builder.add("a", null, "b"));
  }

  public void testBuilderAddAllHandlesNullsCorrectly() {
    {

  public void testContainsEntryNullDisallowedBecauseKeyQueriesDisallowed() {
    assertThrows(NullPointerException.class, () -> multimap().containsEntry(null, v3()));
  }

  @MapFeature.Require(absent = ALLOWS_NULL_VALUE_QUERIES)
  public void testContainsEntryNullDisallowedBecauseValueQueriesDisallowed() {
    assertThrows(NullPointerException.class, () -> multimap().containsEntry(k3(), null));
  }

Actually, `Query`, `Path` and others you'll see next create objects of subclasses of a common `Param` class, which is itself a subclass of Pydantic's `FieldInfo` class.

And Pydantic's `Field` returns an instance of `FieldInfo` as well.

`Body` also returns objects of a subclass of `FieldInfo` directly. And there are others you will see later that are subclasses of the `Body` class.

/**
 * Unit test for {@link TypeParameter}.
 *
 * @author Ben Yu
 */
public class TypeParameterTest extends TestCase {

  public <T> void testCaptureTypeParameter() throws Exception {
    TypeVariable<?> variable = new TypeParameter<T>() {}.typeVariable;
    TypeVariable<?> expected =
        TypeParameterTest.class.getDeclaredMethod("testCaptureTypeParameter")
            .getTypeParameters()[0];

    context.resource.shutdownAll()
  }

  private companion object {
    private val logger = Logger.getLogger(MockWebServerExtension::class.java.name)
    private val namespace = ExtensionContext.Namespace.create(MockWebServerExtension::class.java)
    private val defaultName = MockWebServerExtension::class.java.simpleName
  }

    }

    @Override
    protected Class<? extends WebConfig> typeOfSelectedEntity() {
        return WebConfig.class;
    }

    @Override
    protected Class<WebConfig> typeOfHandlingEntity() {
        return WebConfig.class;
    }

    @Override
    protected Class<WebConfigCB> typeOfHandlingConditionBean() {
        return WebConfigCB.class;
    }

* <a href="https://hub.docker.com/_/postgres" class="external-link" target="_blank">PostgreSQL</a>
* <a href="https://hub.docker.com/_/mysql" class="external-link" target="_blank">MySQL</a>
* <a href="https://hub.docker.com/_/mongo" class="external-link" target="_blank">MongoDB</a>
* <a href="https://hub.docker.com/_/redis" class="external-link" target="_blank">Redis</a>, usw.

You might notice that to create an instance of a Python class, you use that same syntax.

For example:

```Python
class Cat:
    def __init__(self, name: str):
        self.name = name


fluffy = Cat(name="Mr Fluffy")
```

In this case, `fluffy` is an instance of the class `Cat`.

And to create `fluffy`, you are "calling" `Cat`.

So, a Python class is also a **callable**.