today I’m releasing test/spec, a library to do BDD with Test::Unit.
== What is test/spec?
test/spec layers an RSpec-inspired interface on top of Test::Unit, so
you can mix TDD and BDD (Behavior-Driven Development).
test/spec is a clean-room implementation that maps most kinds of
Test::Unit assertions to a `should’-like syntax.
Consider this Test::Unit test case:
class TestFoo < Test::Unit::TestCase def test_should_bar assert_equal 5, 2 + 3 end end
In test/spec, it looks like this:
require 'test/spec' context "Foo" do specify "should bar" do (2 + 3).should.equal 5 end end
test/spec does not include a mocking/stubbing-framework; use whichever
you like to.
test/spec has no dependencies outside Ruby 1.8.
== Mixing test/spec and test/unit
test/spec and Test::Unit contexts/test cases can be intermixed freely,
run in the same test and live in the same files. You can just add them
to your Rake::TestTask, too. test/spec allows you to leverage your
full existing Test::Unit infrastructure.
test/spec does not change Test::Unit with the exception of
monkey-patching Test::Unit::TestSuite to order the test cases before
running them. (This should not do any harm, but if you know a way
around it, please tell me.)
You can use assert_* freely in specify-blocks; Object#should works in
Test::Unit test cases, too, but doesn’t increase the assertion count.
== Wrapped assertions
assert_equal: should.equal, should ==
assert_not_equal: should.not.equal, should.not ==
assert_match: should.match, should =~
assert_no_match: should.not.match, should.not =~
== Additional assertions
These assertions are not included in Test::Unit, but have been added
to test/spec for convenience:
- a.should. (works like assert a.?)
- should.output, to check what is printed
== SpecDox and RDox
test/spec adds two additional test runners to Test::Unit, based on the
console runner but with a different output format.
SpecDox, run with --runner=specdox (or -rs) looks
like RSpec’s output:
spec.output - works for print - works for puts - works with readline
RDox, run with --runner=rdox (or -rr) can be
included for RDoc documentation (e.g. see SPECS):
== spec.output * works for print * works for puts * works with readline
SpecDox and RDox work for Test::Unit too:
$ ruby -r test/spec test/testunit/test_testresult.rb -rs Test::Unit::TC_TestResult - fault notification - passed? - result changed notification Finished in 0.106647 seconds. 3 specifications (30 requirements), 0 failures
== Thanks to
- Eero S. for writing should.output.
- Thomas F. for script.aculo.us BDD testing which convinced me.
- Dave A. for BDD.
- The RSpec team for API inspiration.
- Nathaniel T. for Test::Unit.
Copyright © 2006 Christian N.
test/spec is licensed under the same terms as Ruby itself.
== Where can I get it?
You can download test/spec 0.1 at
Alternatively, you can checkout from the development repository with:
darcs get http://chneukirchen.org/repos/testspec
(Patches using “darcs send” are most welcome.)
Behavior-Driven Development:: http://behaviour-driven.org/
Happy hacking and have a nice day,