Let's start with an example and then see it in detail.

We create an async function `lifespan()` with `yield` like this:

{* ../../docs_src/events/tutorial003.py hl[16,19] *}

* Testes _backend_ _REST_ baseados no **Pytest**, integrados com Docker, então você pode testar a interação completa da API, independente do banco de dados. Como roda no Docker, ele pode construir um novo repositório de dados do zero toda vez (assim você pode usar ElasticSearch, MongoDB, CouchDB, ou o que quiser, e apenas testar que a API esteja funcionando).

	freeVersions, err = xl.listFreeVersions(newtierfi.Volume, newtierfi.Name)
	if err != nil {
		t.Fatalf("failed to list free versions %v", err)
	}
	if len(freeVersions) != 0 {
		t.Fatalf("Expected zero free version but got %d", len(freeVersions))
	}
	report()

	// Adding a free version to a version with no tiered content.
	newfi := fi
	newfi.SetTierFreeVersionID("00000000-0000-0000-0000-0000000000f3")

            return new Iterator<Integer>() {
              @Override
              public void remove() {
                // We should throw here, but we won't!
              }

              @Override
              public Integer next() {
                // We should throw here, but we won't!
                return 0;
              }

              @Override
              public boolean hasNext() {

precision without overflow. Rounding uses IEEE 754 round-to-even rules but with an IEEE
negative zero further simplified to an unsigned zero. Note that constant values never result
in an IEEE negative zero, NaN, or infinity.
</li>

<li>
<code>T</code> is a complex type, and <code>x</code>'s

)

// Legacy envs.
const (
	EnvCompress                 = "MINIO_COMPRESS"
	EnvCompressMimeTypesLegacy1 = "MINIO_COMPRESS_MIMETYPES"

	// These envs were wrong but we supported them for a long time
	// so keep them here to support existing deployments.
	EnvCompressAllowEncryptionLegacy = "MINIO_COMPRESS_ALLOW_ENCRYPTION"
	EnvCompressExtensionsLegacy      = "MINIO_COMPRESS_EXTENSIONS"
	EnvCompressMimeTypesLegacy2      = "MINIO_COMPRESS_MIME_TYPES"

        } catch( UnsupportedEncodingException uee ) {
            return 0;
        }
        bufferIndex += len + 1;
        // win98 observed not returning nativeFileSystem
/* Problems here with iSeries returning ASCII even though useUnicode = true
 * Fortunately we don't really need nativeFileSystem for anything.
        if( byteCount > bufferIndex - start ) {

import org.codehaus.plexus.personality.plexus.lifecycle.phase.Contextualizable;

/**
 * A conflict resolver factory that obtains instances from a plexus container.
 *
 * TODO you don't need the container in here with the active maps (jvz).
 * @since 3.0
 */
@Named
@Singleton
@Deprecated
public class DefaultConflictResolverFactory implements ConflictResolverFactory, Contextualizable {

    return unsafeDelegateList(delegateList().subList(fromIndex, toIndex));
  }

  @Override
  public Object[] toArray() {
    // Note that ArrayList.toArray() doesn't work here because it returns E[]
    // instead of Object[].
    return delegateList().toArray(new Object[size()]);
  }

  @Override
  public boolean equals(@Nullable Object obj) {
    return delegateList().equals(obj);
  }

@SuppressWarnings("serial") // uses writeReplace(), not default serialization
@ElementTypesAreNonnullByDefault
final class SingletonImmutableSet<E> extends ImmutableSet<E> {
  // We deliberately avoid caching the asList and hashCode here, to ensure that with
  // compressed oops, a SingletonImmutableSet packs all the way down to the optimal 16 bytes.

  final transient E element;

  SingletonImmutableSet(E element) {