Tests fail in nixpkgs

[ElvishJerricco]

Nixpkgs always runs tests by default after building sources from Hackage (EDIT: so this isn't necessarily limted to nixpkgs; should fail on anything that tests builds from Hackage). It seems the lack of test/data/dir and test/data/symlinked_dir on the Hackage source for this package causes one of the tests to fail

---

running tests
Running 1 test suites...
Test suite shelly-testsuite: RUNNING...

file with invalid encoding
  readBinary
  readfile
which
  gives full path to cabal
  recognizes cabal as a path executable
  cannot find missing exe
writefile
  creates and overwrites a file
writeBinary
  creates and overwrites a file
appendfile
  creates and appends a file
touchfile
  creates and updates a file
mv file
  to same dir
  to other dir
mv dir
  to dir does not exist: create the to dir
  to dir exists: creates a nested directory, full to path given
  to dir exists: creates a nested directory, partial to path given
rm file
  rm
  rm_r
  rm_f
rm_rf dir
  empty dir
  dir with file
rm symlink
  rm
  rm_f
  rm_rf
relativeTo
  relative to non-existent dir
  relative to existing dir
  abs path relative to existing dir
relative listing
  lists relative files
  finds relative files
find
  empty list for empty dir
  lists relative files
  lists absolute files
  follow symlinks FAILED [1]
  not follow symlinks FAILED [2]
getting unset env variables
  get_env
  get_env_text
with SHELLY var set
  get_env
  get_env_text
failure set to stderr
testing
  writes a failure message to stderr
failure set to directory
testing
  writes a failure message to a .shelly directory
cp file
  cp to same dir
  cp to other dir
cp dir
  to dir does not exist: create the to dir
  to dir exists: creates a nested directory, full to path given
  to dir exists: creates a nested directory, partial to path given
  copies the same dir
basic actions
Hello!
  lifted sub
run
wibble
  simple command
*
  with escaping
ChangeLog.md dist LICENSE README.md Setup Setup.hs shelly.cabal src test
  without escaping
Selbstverständlich überraschend
  with binary handle mode
bash
wibble
  simple command
ChangeLog.md dist LICENSE README.md Setup Setup.hs shelly.cabal src test
  without escaping
Selbstverständlich überraschend
  with binary handle mode
bar
  preserve pipe behaviour
sshCommandText
  simple command
  space command
  multiple space commands
  commands with quotes and spaces

Failures:

  test/src/FindSpec.hs:73: 
  1) find follow symlinks
       expected: [FilePath "dir",FilePath "nonascii.txt",FilePath "symlinked_dir",FilePath "zshrc",FilePath "dir/symlinked_dir",FilePath "dir/symlinked_dir/hoge_file",FilePath "symlinked_dir/hoge_file"]
        but got: [FilePath "nonascii.txt",FilePath "zshrc"]

  test/src/FindSpec.hs:78: 
  2) find not follow symlinks
       expected: [FilePath "dir",FilePath "nonascii.txt",FilePath "symlinked_dir",FilePath "zshrc",FilePath "dir/symlinked_dir",FilePath "symlinked_dir/hoge_file"]
        but got: [FilePath "nonascii.txt",FilePath "zshrc"]

Randomized with seed 155472032

Finished in 0.1488 seconds
57 examples, 2 failures
Test suite shelly-testsuite: FAIL
Test suite logged to: dist/test/shelly-1.7.0-shelly-testsuite.log
0 of 1 test suites (0 of 1 test cases) passed.

[psibi]

Fixed in the latest release.