     -         description: "Upload when length is 0"         act:             operation: upload             arguments:                 filename: "filename"                 source: { $hex : "" }                 options: { chunkSizeBytes : 0 }         assert:             result: "&result"             data:                 -                        { insert : "expected.files", documents : [                         { _id : "*result",  length : 0, chunkSize : 0, uploadDate : "*actual", md0 : "d