Behavior of `getHomeDirectory` and/or `canonicalizePath` is inconsistent across GHC versions

[haskell]

Behavior of `getHomeDirectory` and/or `canonicalizePath` is inconsistent across GHC versions

[Rufflewind]

canonicalizePath used to have unpredictable behavior on non-existent paths in versions of directory older than 1.2.3.0. Since 1.2.3.0, it was fixed to return a sensible result for any path, even non-existent ones. Hence, your test should expect no errors at all, but only if directory is 1.2.3.0 or newer. Otherwise, all bets are off.

Keep in mind that the version of directory is not tied to that of GHC or base. Consider checking for directory's version rather than base:

#if MIN_VERSION_directory(1, 2, 3)

Your Travis tests for GHC 7.8 pulled in directory-1.2.5.0, but for GHC 7.10 it was using directory-1.2.2.0.

[mrkkrp]

Thanks for the explanation, I will update the tests accordingly.