minitest provides a complete suite of testing facilities supporting TDD, BDD, mocking, and benchmarking.
"I had a class with Jim Weirich on testing last week and we were allowed to choose our testing frameworks. Kirk Haines and I were paired up and we cracked open the code for a few test frameworks... I MUST say that mintiest is *very* readable / understandable compared to the 'other two' options we looked at. Nicely done and thank you for helping us keep our mental sanity." -- Wayne E. Seguin
minitest/unit is a small and incredibly fast unit testing framework. It provides a rich set of assertions to make your tests clean and readable.
minitest/spec is a functionally complete spec engine. It hooks onto minitest/unit and seamlessly bridges test assertions over to spec expectations.
minitest/benchmark is an awesome way to assert the performance of your algorithms in a repeatable manner. Now you can assert that your newb co-worker doesn't replace your linear algorithm with an exponential one!
minitest/mock by Steven Baker, is a beautifully tiny mock object framework.
minitest/pride shows pride in testing and adds coloring to your test output. I guess it is an example of how to write IO pipes too. :P
minitest/unit is meant to have a clean implementation for language implementors that need a minimal set of methods to bootstrap a working test suite. For example, there is no magic involved for test-case discovery.
"Again, I can't praise enough the idea of a testing/specing framework that I can actually read in full in one sitting!" -- Piotr Szotkowski
minitest/autorun - the easy and explicit way to run all your tests.
minitest/unit - a very fast, simple, and clean test system.
minitest/spec - a very fast, simple, and clean spec system.
minitest/mock - a simple and clean mock system.
minitest/benchmark - an awesome way to assert your algorithm's performance.
minitest/pride - show your pride in testing!
Incredibly small and fast runner, but no bells and whistles.
See design_rationale.rb to see how specs and tests work in minitest.
Given that you'd like to test the following class:
class Meme def i_can_has_cheezburger? "OHAI!" end def will_it_blend? "YES!" end end
require 'minitest/autorun' class TestMeme < MiniTest::Unit::TestCase def setup @meme = Meme.new end def test_that_kitty_can_eat assert_equal "OHAI!", @meme.i_can_has_cheezburger? end def test_that_it_will_not_blend refute_match /^no/i, @meme.will_it_blend? end end
require 'minitest/autorun' describe Meme do before do @meme = Meme.new end describe "when asked about cheeseburgers" do it "must respond positively" do @meme.i_can_has_cheezburger?.must_equal "OHAI!" end end describe "when asked about blending possibilities" do it "won't say no" do @meme.will_it_blend?.wont_match /^no/i end end end
For matchers support check out: github.com/zenspider/minitest-matchers
Add benchmarks to your regular unit tests. If the unit tests fail, the benchmarks won't run.
# optionally run benchmarks, good for CI-only work! require 'minitest/benchmark' if ENV["BENCH"] class TestMeme < MiniTest::Unit::TestCase # Override self.bench_range or default range is [1, 10, 100, 1_000, 10_000] def bench_my_algorithm assert_performance_linear 0.9999 do |n| # n is a range value @obj.my_algorithm(n) end end end
Or add them to your specs. If you make benchmarks optional, you'll need to wrap your benchmarks in a conditional since the methods won't be defined.
describe Meme do if ENV["BENCH"] then bench_performance_linear "my_algorithm", 0.9999 do |n| 100.times do @obj.my_algorithm(n) end end end end
outputs something like:
# Running benchmarks: TestBlah 100 1000 10000 bench_my_algorithm 0.006167 0.079279 0.786993 bench_other_algorithm 0.061679 0.792797 7.869932
Output is tab-delimited to make it easy to paste into a spreadsheet.
class MemeAsker def initialize(meme) @meme = meme end def ask(question) method = question.tr(" ","_") + "?" @meme.send(method) end end require 'minitest/autorun' describe MemeAsker do before do @meme = MiniTest::Mock.new @meme_asker = MemeAsker.new @meme end describe "#ask" do describe "when passed an unpunctuated question" do it "should invoke the appropriate predicate method on the meme" do @meme.expect :will_it_blend?, :return_value @meme_asker.ask "will it blend" @meme.verify end end end end
Customizable Test Runner Types:
MiniTest::Unit.runner=(runner) provides an easy way of creating custom test runners for specialized needs. Justin Weiss provides the following real-world example to create an alternative to regular fixture loading:
class MiniTestWithHooks::Unit < MiniTest::Unit def before_suites end def after_suites end def _run_suites(suites, type) begin before_suites super(suites, type) ensure after_suites end end def _run_suite(suite, type) begin suite.before_suite super(suite, type) ensure suite.after_suite end end end module MiniTestWithTransactions class Unit < MiniTestWithHooks::Unit include TestSetupHelper def before_suites super setup_nested_transactions # load any data we want available for all tests end def after_suites teardown_nested_transactions super end end end MiniTest::Unit.runner = MiniTestWithTransactions::Unit.new
Ruby 1.8, maybe even 1.6 or lower. No magic is involved.
sudo gem install minitest
On 1.9, you already have it. To get newer candy you can still install the gem, but you'll need to activate the gem explicitly to use it:
require 'rubygems' gem 'minitest' # ensures you're using the gem, and not the built in MT require 'minitest/autorun' # ... usual testing stuffs ...
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Copyright © Ryan Davis, seattle.rb
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