[Hackage] #938: cabal test does not tail standard output of the running test executable

[Hackage]

#938: cabal test does not tail standard output of the running test executable
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  Reporter:  fushunpoon          |        Owner:          
      Type:  defect              |       Status:  new     
  Priority:  normal              |    Milestone:          
 Component:  cabal-install tool  |      Version:  1.10.2.0
  Severity:  minor               |     Keywords:          
Difficulty:  easy (<4 hours)     |   Ghcversion:          
  Platform:                      |  
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 == Problem: ==

 cabal test does not tail standard output of the running test executable.
 Instead, any output from the executable is output right at the end of the
 test process in one batch.

 == Motivation: ==

 It is incredibly useful to have cabal test tail the stdout of the test
 executable currently being executed such that CI tools such as TeamCity
 can be made to record the time it takes to run individual tests.

 == Reproduction: ==

 Run the following simple executable as a test executable with
 {{{cabal test --show-details=always}}}
 {{{
 module Main where

 import Control.Concurrent

 delay = 5000000

 main = do
   putStrLn "First message"
   threadDelay delay
   putStrLn "Second message"
   threadDelay delay
   putStrLn "Third message"
   threadDelay delay
 }}}

 Instead of outputting each line ("First/Second/Third message") five
 seconds after another, all three lines are output along with test result
 reporting all at once at the end of the test suite.

-- 
Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/938>
Hackage <http://haskell.org/cabal/>
Hackage: Cabal and related projects