return nil, true
	}
	if _, ok := metadata[MetaContext]; ok {
		return nil, true
	}
	return nil, false
}

// CreateMultipartMetadata adds the multipart flag entry to metadata
// and returns modified metadata. It allocates a new metadata map if
// metadata is nil.
func CreateMultipartMetadata(metadata map[string]string) map[string]string {
	if metadata == nil {
		return map[string]string{MetaMultipart: ""}
	}

		},
		SealedKey: SealedKey{Algorithm: InsecureSealAlgorithm, Key: [64]byte{1}, IV: [32]byte{1}},
	}, // 7
}

func TestCreateMultipartMetadata(t *testing.T) {
	metadata := CreateMultipartMetadata(nil)
	if v, ok := metadata[MetaMultipart]; !ok || v != "" {
		t.Errorf("Metadata is missing the correct value for '%s': got '%s' - want '%s'", MetaMultipart, v, "")
	}
}