[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2489: Magic Folder: write unit test for Downloader._write_downloaded_file

[Tahoe-LAFS]

#2489: Magic Folder: write unit test for Downloader._write_downloaded_file
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     Reporter:  daira                |      Owner:  vu3rdd
         Type:  task                 |     Status:  new
     Priority:  normal               |  Milestone:  undecided
    Component:  code-frontend-       |    Version:  1.10.1
  magic-folder                       |   Keywords:  otf-magic-folder-
   Resolution:                       |  objective4 earth-dragon
Launchpad Bug:                       |
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Comment (by dawuud):

 i found that `replace_file` function throws an exception if the
 `replaced_path` doesn't exist.
 that and other changes here in my dev branch with all the unit tests
 passing again:

 https://github.com/david415/tahoe-lafs/tree/2489.write_downloaded_file.0

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2489#comment:3>
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