Add a test for 'tahoe list-aliases --readonly-uri'

[meejah]

No description provided.

[codecov-io]

Codecov Report

Merging #403 into master will increase coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #403      +/-   ##
==========================================
+ Coverage   87.97%   88.03%   +0.05%     
==========================================
  Files         145      145              
  Lines       27439    27439              
  Branches     3898     3805      -93     
==========================================
+ Hits        24139    24155      +16     
+ Misses       2599     2588      -11     
+ Partials      701      696       -5

Impacted Files	Coverage Δ
src/allmydata/introducer/common.py	96.29% <0%> (-0.07%)	⬇️
src/allmydata/util/connection_status.py	97.67% <0%> (-0.06%)	⬇️
src/allmydata/immutable/filenode.py	95.91% <0%> (ø)	⬆️
src/allmydata/mutable/filenode.py	98.59% <0%> (ø)	⬆️
src/allmydata/scripts/magic_folder_cli.py	52.76% <0%> (ø)	⬆️
src/allmydata/immutable/downloader/status.py	98.65% <0%> (ø)	⬆️
src/allmydata/immutable/upload.py	96.34% <0%> (ø)	⬆️
src/allmydata/storage_client.py	93.85% <0%> (ø)	⬆️
src/allmydata/immutable/offloaded.py	92.85% <0%> (ø)	⬆️
src/allmydata/mutable/retrieve.py	95.91% <0%> (ø)	⬆️
... and 9 more

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[meejah]

@warner just rebased this, should be good to merge

[meejah]

I don't see how the mac failure can be related to this new test...