Single message finalizing appendable upload returns incorrect metadata

[BenWhitehead]

Testbench v0.55.0

Testbench does not currently return correct metadata for a single message that should create and finalize the upload.

Request

BidiWriteObjectRequest{
  write_object_spec {
    resource { name: "my-object" bucket: "projects/_/buckets/my-bucket" }
    appendable: true
  }
  checksummed_data { content: "ABDE" crc32c: 1939456564 }
  object_checksums { crc32c: 1939456564 }
  finish_write: true
}

Response

BidiWriteObjectResponse{
  resource {
    name: "my-object"
    bucket: "my-bucket"
    generation: 1753465277702
    metageneration: 1
    create_time { seconds: 1753467592 nanos: 932413000 }
    checksums { crc32c: 1939456564 md5_hash: "\324\035\214\331\217\000\262\004\351\200\t\230\354\370B~" }
    update_time { seconds: 1753467592 nanos: 932413000 }
    metadata { key: "x_emulator_crc32c" value: "c5nCNA==" }
    metadata { key: "x_emulator_no_md5" value: "true" }
    metadata { key: "x_emulator_upload" value: "grpc" }
    owner { entity: "user-object.owners@example.com" }
    etag: "c4ca4238a0b923820dcc509a6f75849b"
    finalize_time { seconds: 1753467592 nanos: 932587000 }
  }
  write_handle { handle: "ef6892351f0affef044b62f4712b05af88b45245e6f7bd44b62d9e873022bf05" }
}

OK