shelltest always uses the shell sh

[asr]

I'm getting the following error:

$ echo $0
bash

$ shelltest --version
shelltest 1.3.5

$ cat test.test
diff <(ghc -V) <(ghc -V)
<<<
>>>
>>>2
>>>= 0

$ shelltest test.test 
:test.test: [Failed]

Expected stderr: 

Got stderr:      
/bin/sh: 1: Syntax error: "(" unexpected

Expected exit code: 
0
Got exit code:      
2

Note that I'm using bash but the error mentions sh. The error is due to the command

diff <(ghc -V) <(ghc -V)

is accepted by bash but rejected by sh, and shelltest is using sh.

[asr]

CC'ing @jonaprieto.

[simonmichael]

I see you're right. Unfortunately process hardcodes "/bin/sh" on POSIX (and "cmd" on Windows) so shelltestrunner doesn't support this at present.

[asr]

Unfortunately process hardcodes "/bin/sh" on POSIX

You are right. I filed haskell/process#84.

[simonmichael]

As I just commented there, we probably don't want test success depending on current user's shell preference. It would be ok to specify it with a command-line option or some notation in the test though.

[asr]

It would be ok to specify it with a command-line option or some notation in the test though.

A command-line option would be nice.