The TBC package

[ Tags: bsd3, library, program, testing ] [ Propose Tags ]

TBC is a harness for running tests, relying on other libraries such as QuickCheck and HUnit to do the actual testing. TBC lets you skip a lot of boilerplate by adopting naming conventions for tests. It also supports test-driven development (TDD) by running as many tests as it can compile, whatever the state of the project as a whole. For further information see the examples that accompany the distribution.

[Skip to Readme]


Versions 0.0.1, 0.0.2, 0.0.3
Dependencies base (==4.*), Cabal (>=1.10 && <2), deepseq, directory, filepath, process, unix [details]
License BSD3
Copyright Peter Gammie, Mark Wotton
Author Peter Gammie, Mark Wotton
Category Testing
Source repository head: git clone git://
Uploaded Sun Jun 24 05:17:20 UTC 2012 by PeterGammie
Distributions NixOS:0.0.3
Executables tbc
Downloads 968 total (6 in the last 30 days)
Rating 0.0 (0 ratings) [clear rating]
  • λ
  • λ
  • λ
Status Docs uploaded by user
Build status unknown [no reports yet]
Hackage Matrix CI




Maintainer's Corner

For package maintainers and hackage trustees

Readme for TBC-0.0.3

[back to package description]
= TBC: Test by Convention =

TBC provides two features:

- It attempts to compile and run all tests, even if some do not
  compile or run.
- Aspiring to the write-it-once principle, tests following
  conventions require a lot less boilerplate.

Inspired by test-based development, our aim is not to displace
existing tools such as QuickCheck and HUnit but to make a project's
tests more useful when things are in an inconsistent state. TBC is
also useful for supporting 'what-if' experiments, aiding program

TBC is presently alpha. It has proven useful to the authors but is
embryonic in many ways.

The directory 'Sample/' contains a sample project following TBC
conventions. We suggest running 'tbc' in that directory as a quick way
of understanding what it can do.

== Conventions ==

Tests live in $PROJECT/Tests. Test-specific hierarchical modules can
also exist there.

Within a test file, lines beginning with _ should _ when evaluated:

"exception_" / throw an exception.
"hunit_" / be HUnit tests: TBC applies "runTestTT . test" to them.
"ok_" / not throw an exception.
"prop_" / be QuickCheck tests: TBC applies "Test.QuickCheck.quickCheck" to them.
"test_" / be boolean tests (of type Bool or IO Bool or IO () with a
print statement or ...): TBC runs them and expects the final line of
output to be "True".

The tests themselves must ensure the test framework (QuickCheck, etc.)
is in scope, i.e. be executable as they are in GHCi.

The 'tbc' executable will search upwards for a '.cabal' file and
assumes the 'dist/' directory is in the same place.

== Invocation ==

There are two ways to use TBC:

- as a Cabal 'test' hook. This is not recommended as packages that do
  this cannot be uploaded to hackage. Perhaps changes in Cabal will
  make this more useful.

- invoking the 'tbc' executable.

The 'tbc' executable will search upwards in the directory hierarchy
for a .cabal file, and then go looking for tests in the current
directory and its children.

Presently it is best to run 'tbc' in the directory containing the
tests (or a subdirectory of it).

The Sample/ directory contains a sample project. After installing TBC:

$ cd Sample
$ runghc Setup configure
$ tbc
$ cd Tests
$ tbc

== Gotchas ==


tbc -v

for a verbose session.

It seems that the parts of Cabal that TBC depends on change
frequently. TBC has only been tested with Cabal- in the
Haskell Platform 2011.2.0.1.

It is probably not difficult to make it work with other Cabals. Mostly
this involves copying out the guts of some of the Cabal modules.

Conventions must retain the full name of the test, otherwise we run
into some nasty lexical issues, e.g. to avoid:

hunit_prop_blah =tName equals= prop_blah

We only support GHCi on *NIX (including OS X) presently.


$ tbc
>> GHCi died. Output <<
GHCi, version 7.0.3:  :? for help
TBC: fd:4: hFlush: resource vanished (Broken pipe)

probably means that you need to reconfigure your project as one of
libraries it depends on has a different hash but not a new version
number. (For example, Cabal calls QuickCheck- the
overly-specific QuickCheck-

== Changes ==

  Initial release
  The tbc binary exits with status 1 if anything goes wrong, 0 otherwise
  Fixed GHCi scoping issue (say ":l *filename" instead of ":l filename" - perhaps new with GHC 7.
  Andy Morris: support for Bird tracks
  Works with the Haskell Platform 2011.2.0.1
   - GHC 7.0.3
   - QuickCheck 2