minitest/{test,spec,mock,benchmark} ↑

home

github.com/minitest/minitest

bugs

github.com/minitest/minitest/issues

rdoc

docs.seattlerb.org/minitest

clog

github.com/minitest/minitest/blob/master/History.rdoc

vim

github.com/sunaku/vim-ruby-minitest

emacs

github.com/arthurnn/minitest-emacs

DESCRIPTION: ↑

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 minitest 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/test 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/test 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 (and stub) 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/test 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

Comparing to rspec:

rspec is a testing DSL. minitest is ruby.

-- Adam Hawkins, "Bow Before MiniTest"

minitest doesn’t reinvent anything that ruby already provides, like: classes, modules, inheritance, methods. This means you only have to learn ruby to use minitest and all of your regular OO practices like extract-method refactorings still apply.

FEATURES/PROBLEMS: ↑

RATIONALE: ↑

See design_rationale.rb to see how specs and tests work in minitest.

SYNOPSIS: ↑

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

Unit tests ↑

Define your tests as methods beginning with test_.

require "minitest/autorun"

class TestMeme < Minitest::Test
  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

  def test_that_will_be_skipped
    skip "test this later"
  end
end

Specs ↑

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:

Benchmarks ↑

Add benchmarks to your tests.

# optionally run benchmarks, good for CI-only work!
require "minitest/benchmark" if ENV["BENCH"]

class TestMeme < Minitest::Benchmark
  # 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. In minitest 5, the describe name needs to match /Bench(mark)?$/.

describe "Meme Benchmark" 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.

Mocks ↑

Mocks and stubs defined using terminology by Fowler & Meszaros at www.martinfowler.com/bliki/TestDouble.html:

“Mocks are pre-programmed with expectations which form a specification of the calls they are expected to receive. They can throw an exception if they receive a call they don’t expect and are checked during verification to ensure they got all the calls they were expecting.”

class MemeAsker
  def initialize(meme)
    @meme = meme
  end

  def ask(question)
    method = question.tr(" ", "_") + "?"
    @meme.__send__(method)
  end
end

require "minitest/autorun"

describe MemeAsker, :ask do
  describe "when passed an unpunctuated question" do
    it "should invoke the appropriate predicate method on the meme" do
      @meme = Minitest::Mock.new
      @meme_asker = MemeAsker.new @meme
      @meme.expect :will_it_blend?, :return_value

      @meme_asker.ask "will it blend"

      @meme.verify
    end
  end
end

Multi-threading and Mocks ↑

Minitest mocks do not support multi-threading. If it works, fine, if it doesn’t you can use regular ruby patterns and facilities like local variables. Here’s an example of asserting that code inside a thread is run:

def test_called_inside_thread
  called = false
  pr = Proc.new { called = true }
  thread = Thread.new(&pr)
  thread.join
  assert called, "proc not called"
end

Stubs ↑

Mocks and stubs are defined using terminology by Fowler & Meszaros at www.martinfowler.com/bliki/TestDouble.html:

“Stubs provide canned answers to calls made during the test”.

Minitest’s stub method overrides a single method for the duration of the block.

def test_stale_eh
  obj_under_test = Something.new

  refute obj_under_test.stale?

  Time.stub :now, Time.at(0) do   # stub goes away once the block is done
    assert obj_under_test.stale?
  end
end

A note on stubbing: In order to stub a method, the method must actually exist prior to stubbing. Use a singleton method to create a new non-existing method:

def obj_under_test.fake_method
  ...
end

Running Your Tests ↑

Ideally, you’ll use a rake task to run your tests (see below), either piecemeal or all at once. BUT! You don’t have to:

% ruby -Ilib:test test/minitest/test_minitest_test.rb
Run options: --seed 37685

# Running:

...................................................................... (etc)

Finished in 0.107130s, 1446.8403 runs/s, 2959.0217 assertions/s.

155 runs, 317 assertions, 0 failures, 0 errors, 0 skips

There are runtime options available, both from minitest itself, and also provided via plugins. To see them, simply run with --help:

% ruby -Ilib:test test/minitest/test_minitest_test.rb --help
minitest options:
    -h, --help                       Display this help.
    -s, --seed SEED                  Sets random seed. Also via env. Eg: SEED=n rake
    -v, --verbose                    Verbose. Show progress processing files.
    -n, --name PATTERN               Filter run on /regexp/ or string.
    -e, --exclude PATTERN            Exclude /regexp/ or string from run.

Known extensions: pride, autotest
    -p, --pride                      Pride. Show your testing pride!
    -a, --autotest                   Connect to autotest server.

Rake Tasks ↑

You can set up a rake task to run all your tests by adding this to your Rakefile:

require "minitest/test_task"

Minitest::TestTask.create # named test, sensible defaults

# or more explicitly:

Minitest::TestTask.create(:test) do |t|
  t.libs << "test"
  t.libs << "lib"
  t.warning = false
  t.test_globs = ["test/**/*_test.rb"]
end

task :default => :test

Each of these will generate 4 tasks:

rake test          :: Run the test suite.
rake test:cmd      :: Print out the test command.
rake test:isolated :: Show which test files fail when run separately.
rake test:slow     :: Show bottom 25 tests sorted by time.

Rake Task Variables ↑

There are a bunch of variables you can supply to rake to modify the run.

MT_LIB_EXTRAS :: Extra libs to dynamically override/inject for custom runs.
N             :: -n: Tests to run (string or /regexp/).
X             :: -x: Tests to exclude (string or /regexp/).
A             :: Any extra arguments. Honors shell quoting.
MT_CPU        :: How many threads to use for parallel test runs
SEED          :: -s --seed Sets random seed.
TESTOPTS      :: Deprecated, same as A
FILTER        :: Deprecated, same as A

Writing Extensions ↑

To define a plugin, add a file named minitest/XXX_plugin.rb to your project/gem. That file must be discoverable via ruby’s LOAD_PATH (via rubygems or otherwise). Minitest will find and require that file using Gem.find_files. It will then try to call plugin_XXX_init during startup. The option processor will also try to call plugin_XXX_options passing the OptionParser instance and the current options hash. This lets you register your own command-line options. Here’s a totally bogus example:

# minitest/bogus_plugin.rb:

module Minitest
  def self.plugin_bogus_options(opts, options)
    opts.on "--myci", "Report results to my CI" do
      options[:myci] = true
      options[:myci_addr] = get_myci_addr
      options[:myci_port] = get_myci_port
    end
  end

  def self.plugin_bogus_init(options)
    self.reporter << MyCI.new(options) if options[:myci]
  end
end

Adding custom reporters ↑

Minitest uses composite reporter to output test results using multiple reporter instances. You can add new reporters to the composite during the init_plugins phase. As we saw in plugin_bogus_init above, you simply add your reporter instance to the composite via <<.

AbstractReporter defines the API for reporters. You may subclass it and override any method you want to achieve your desired behavior.

start

Called when the run has started.

record

Called for each result, passed or otherwise.

report

Called at the end of the run.

passed?

Called to see if you detected any problems.

Using our example above, here is how we might implement MyCI:

# minitest/bogus_plugin.rb

module Minitest
  class MyCI < AbstractReporter
    attr_accessor :results, :addr, :port

    def initialize options
      self.results = []
      self.addr = options[:myci_addr]
      self.port = options[:myci_port]
    end

    def record result
      self.results << result
    end

    def report
      CI.connect(addr, port).send_results self.results
    end
  end

  # code from above...
end

FAQ ↑

What versions are compatible with what? Or what versions are supported? ↑

Minitest is a dependency of rails, which until very recently had an overzealous backwards compatibility policy. As such, I’m stuck supporting versions of ruby that are long past EOL. Hopefully I’ll be able to support only current versions of ruby sometime in the near future.

(As of 2024-05-10)

Current versions of rails: (endoflife.date/rails)

| rails | min ruby | minitest | status   |  EOL Date  |
|-------+----------+----------+----------+------------|
|   7.1 | >= 2.7   | >= 5.1   | Current  | 2026-06-01?|
|   7.0 | >= 2.7   | >= 5.1   | Maint    | 2025-06-01?|
|   6.1 | >= 2.5   | >= 5.1   | Security | 2024-06-01?|
|   6.0 | >= 2.5   | >= 5.1   | EOL      | 2023-06-01 |
|   5.2 | >= 2.2.2 | ~> 5.1   | EOL      | 2022-06-01 |

If you want to look at the requirements for a specific version, run:

gem spec -r --ruby rails -v 7.0.0

Current versions of ruby: (endoflife.date/ruby)

| ruby | Status  |   EOL Date |
|------+---------+------------|
|  3.3 | Current | 2027-03-31 |
|  3.2 | Maint   | 2026-03-31 |
|  3.1 | Security| 2025-03-31 |
|  3.0 | EOL     | 2024-03-31 |
|  2.7 | EOL     | 2023-03-31 |
|  2.6 | EOL     | 2022-03-31 |
|  2.5 | EOL     | 2021-03-31 | DO YOU SEE WHAT I'M STUCK WITH???

How to test SimpleDelegates? ↑

The following implementation and test:

class Worker < SimpleDelegator
  def work
  end
end

describe Worker do
  before do
    @worker = Worker.new(Object.new)
  end

  it "must respond to work" do
    _(@worker).must_respond_to :work
  end
end

outputs a failure:

  1) Failure:
Worker#test_0001_must respond to work [bug11.rb:16]:
Expected #<Object:0x007f9e7184f0a0> (Object) to respond to #work.

Worker is a SimpleDelegate which in 1.9+ is a subclass of BasicObject. Expectations are put on Object (one level down) so the Worker (SimpleDelegate) hits method_missing and delegates down to the Object.new instance. That object doesn’t respond to work so the test fails.

You can bypass SimpleDelegate#method_missing by extending the worker with Minitest::Expectations. You can either do that in your setup at the instance level, like:

before do
  @worker = Worker.new(Object.new)
  @worker.extend Minitest::Expectations
end

or you can extend the Worker class (within the test file!), like:

class Worker
  include ::Minitest::Expectations
end

How to share code across test classes? ↑

Use a module. That’s exactly what they’re for:

module UsefulStuff
  def useful_method
    # ...
  end
end

describe Blah do
  include UsefulStuff

  def test_whatever
    # useful_method available here
  end
end

Remember, describe simply creates test classes. It’s just ruby at the end of the day and all your normal Good Ruby Rules (tm) apply. If you want to extend your test using setup/teardown via a module, just make sure you ALWAYS call super. before/after automatically call super for you, so make sure you don’t do it twice.

How to run code before a group of tests? ↑

Use a constant with begin…end like this:

describe Blah do
  SETUP = begin
     # ... this runs once when describe Blah starts
  end
  # ...
end

This can be useful for expensive initializations or sharing state. Remember, this is just ruby code, so you need to make sure this technique and sharing state doesn’t interfere with your tests.

Why am I seeing uninitialized constant MiniTest::Test (NameError)? ↑

Are you running the test with Bundler (e.g. via bundle exec )? If so, in order to require minitest, you must first add the gem 'minitest' to your Gemfile and run bundle. Once it’s installed, you should be able to require minitest and run your tests.

Prominent Projects using Minitest: ↑

Developing Minitest: ↑

Minitest requires Hoe.

Minitest’s own tests require UTF-8 external encoding. ↑

This is a common problem in Windows, where the default external Encoding is often CP850, but can affect any platform. Minitest can run test suites using any Encoding, but to run Minitest’s own tests you must have a default external Encoding of UTF-8.

If your encoding is wrong, you’ll see errors like:

--- expected
+++ actual
@@ -1,2 +1,3 @@
 # encoding: UTF-8
 -"Expected /\\w+/ to not match \"blah blah blah\"."
 +"Expected /\\w+/ to not match # encoding: UTF-8
 +\"blah blah blah\"."

To check your current encoding, run:

ruby -e 'puts Encoding.default_external'

If your output is something other than UTF-8, you can set the RUBYOPTS env variable to a value of ‘-Eutf-8’. Something like:

RUBYOPT='-Eutf-8' ruby -e 'puts Encoding.default_external'

Check your OS/shell documentation for the precise syntax (the above will not work on a basic Windows CMD prompt, look for the SET command). Once you’ve got it successfully outputing UTF-8, use the same setting when running rake in Minitest.

Minitest’s own tests require GNU (or similar) diff. ↑

This is also a problem primarily affecting Windows developers. PowerShell has a command called diff, but it is not suitable for use with Minitest.

If you see failures like either of these, you are probably missing diff tool:

  4) Failure:
TestMinitestUnitTestCase#test_assert_equal_different_long [D:/ruby/seattlerb/minitest/test/minitest/test_minitest_test.rb:936]:
Expected: "--- expected\n+++ actual\n@@ -1 +1 @@\n-\"hahahahahahahahahahahahahahahahahahahaha\"\n+\"blahblahblahblahblahblahblahblahblahblah\"\n"
  Actual: "Expected: \"hahahahahahahahahahahahahahahahahahahaha\"\n  Actual: \"blahblahblahblahblahblahblahblahblahblah\""

  5) Failure:
TestMinitestUnitTestCase#test_assert_equal_different_collection_hash_hex_invisible [D:/ruby/seattlerb/minitest/test/minitest/test_minitest_test.rb:845]:
Expected: "No visible difference in the Hash#inspect output.\nYou should look at the implementation of #== on Hash or its members.\n
{1=>#<Object:0xXXXXXX>}"
  Actual: "Expected: {1=>#<Object:0x00000003ba0470>}\n  Actual: {1=>#<Object:0x00000003ba0448>}"

If you use Cygwin or MSYS2 or similar there are packages that include a GNU diff for Windows. If you don’t, you can download GNU diffutils from gnuwin32.sourceforge.net/packages/diffutils.htm (make sure to add it to your PATH).

You can make sure it’s installed and path is configured properly with:

diff.exe -v

There are multiple lines of output, the first should be something like:

diff (GNU diffutils) 2.8.1

If you are using PowerShell make sure you run diff.exe, not just diff, which will invoke the PowerShell built in function.

Known Extensions: ↑

capybara_minitest_spec

Bridge between Capybara RSpec matchers and Minitest::Spec expectations (e.g. page.must_have_content("Title")).

color_pound_spec_reporter

Test names print Ruby Object types in color with your Minitest Spec style tests.

minispec-metadata

Metadata for describe/it blocks & CLI tag filter. E.g. it "requires JS driver", js: true do & ruby test.rb --tag js runs tests tagged :js.

minispec-rails

Minimal support to use Spec style in Rails 5+.

mini-apivore

for swagger based automated API testing.

minitest-around

Around block for minitest. An alternative to setup/teardown dance.

minitest-assert_errors

Adds Minitest assertions to test for errors raised or not raised by Minitest itself.

minitest-autotest

autotest is a continuous testing facility meant to be used during development.

minitest-bacon

minitest-bacon extends minitest with bacon-like functionality.

minitest-bang

Adds support for RSpec-style let! to immediately invoke let statements before each test.

minitest-bisect

Helps you isolate and debug random test failures.

minitest-blink1_reporter

Display test results with a Blink1.

minitest-capistrano

Assertions and expectations for testing Capistrano recipes.

minitest-capybara

Capybara matchers support for minitest unit and spec.

minitest-cc

It provides minimal information about code coverage.

minitest-chef-handler

Run Minitest suites as Chef report handlers

minitest-ci

CI reporter plugin for Minitest.

minitest-context

Defines contexts for code reuse in Minitest specs that share common expectations.

minitest-debugger

Wraps assert so failed assertions drop into the ruby debugger.

minitest-display

Patches Minitest to allow for an easily configurable output.

minitest-documentation

Minimal documentation format inspired by rspec’s.

minitest-doc_reporter

Detailed output inspired by rspec’s documentation format.

minitest-emoji

Print out emoji for your test passes, fails, and skips.

minitest-english

Semantically symmetric aliases for assertions and expectations.

minitest-excludes

Clean API for excluding certain tests you don’t want to run under certain conditions.

minitest-fail-fast

Reimplements RSpec’s “fail fast” feature

minitest-filecontent

Support unit tests with expectation results in files. Differing results will be stored again in files.

minitest-filesystem

Adds assertion and expectation to help testing filesystem contents.

minitest-firemock

Makes your Minitest mocks more resilient.

minitest-focus

Focus on one test at a time.

minitest-gcstats

A minitest plugin that adds a report of the top tests by number of objects allocated.

minitest-global_expectations

Support minitest expectation methods for all objects

minitest-great_expectations

Generally useful additions to minitest’s assertions and expectations.

minitest-growl

Test notifier for minitest via growl.

minitest-happy

GLOBALLY ACTIVATE MINITEST PRIDE! RAWR!

minitest-have_tag

Adds Minitest assertions to test for the existence of HTML tags, including contents, within a provided string.

minitest-heat

Reporting that builds a heat map of failure locations

minitest-hooks

Around and before_all/after_all/around_all hooks

minitest-hyper

Pretty, single-page HTML reports for your Minitest runs

minitest-implicit-subject

Implicit declaration of the test subject.

minitest-instrument

Instrument ActiveSupport::Notifications when test method is executed.

minitest-instrument-db

Store information about speed of test execution provided by minitest-instrument in database.

minitest-junit

JUnit-style XML reporter for minitest.

minitest-keyword

Use Minitest assertions with keyword arguments.

minitest-libnotify

Test notifier for minitest via libnotify.

minitest-line

Run test at line number.

minitest-logger

Define assert_log and enable minitest to test log messages. Supports Logger and Log4r::Logger.

minitest-macruby

Provides extensions to minitest for macruby UI testing.

minitest-matchers

Adds support for RSpec-style matchers to minitest.

minitest-matchers_vaccine

Adds assertions that adhere to the matcher spec, but without any expectation infections.

minitest-metadata

Annotate tests with metadata (key-value).

minitest-mock_expectations

Provides method call assertions for minitest.

minitest-mongoid

Mongoid assertion matchers for Minitest.

minitest-must_not

Provides must_not as an alias for wont in Minitest.

minitest-optional_retry

Automatically retry failed test to help with flakiness.

minitest-osx

Reporter for the Mac OS X notification center.

minitest-parallel_fork

Fork-based parallelization

minitest-parallel-db

Run tests in parallel with a single database.

minitest-power_assert

PowerAssert for Minitest.

minitest-predicates

Adds support for .predicate? methods.

minitest-profile

List the 10 slowest tests in your suite.

minitest-rails

Minitest integration for Rails 3.x.

minitest-rails-capybara

Capybara integration for Minitest::Rails.

minitest-reporters

Create customizable Minitest output formats.

minitest-rg

Colored red/green output for Minitest.

minitest-rspec_mocks

Use RSpec Mocks with Minitest.

minitest-server

minitest-server provides a client/server setup with your minitest process, allowing your test run to send its results directly to a handler.

minitest-sequel

Minitest assertions to speed-up development and testing of Ruby Sequel database setups.

minitest-shared_description

Support for shared specs and shared spec subclasses

minitest-should_syntax

RSpec-style x.should == y assertions for Minitest.

minitest-shouldify

Adding all manner of shoulds to Minitest (bad idea)

minitest-snail

Print a list of tests that take too long

minitest-spec-context

Provides rspec-ish context method to Minitest::Spec.

minitest-spec-expect

Expect syntax for Minitest::Spec (e.g. expect(sequences).to_include :celery_man).

minitest-spec-magic

Minitest::Spec extensions for Rails and beyond.

minitest-spec-rails

Drop in Minitest::Spec superclass for ActiveSupport::TestCase.

minitest-sprint

Runs (Get it? It’s fast!) your tests and makes it easier to rerun individual failures.

minitest-stately

Find leaking state between tests

minitest-stub_any_instance

Stub any instance of a method on the given class for the duration of a block.

minitest-stub-const

Stub constants for the duration of a block.

minitest-tags

Add tags for minitest.

minitest-unordered

Adds a new assertion to minitest for checking the contents of a collection, ignoring element order.

minitest-vcr

Automatic cassette management with Minitest::Spec and VCR.

minitest_log

Adds structured logging, data explication, and verdicts.

minitest_owrapper

Get tests results as a TestResult object.

minitest_should

Shoulda style syntax for minitest test::unit.

minitest_tu_shim

Bridges between test/unit and minitest.

mongoid-minitest

Minitest matchers for Mongoid.

mutant-minitest

Minitest integration for mutant.

pry-rescue

A pry plugin w/ minitest support. See pry-rescue/minitest.rb.

rematch

Declutter your test files from large hardcoded data and update them automatically when your code changes.

rspec2minitest

Easily translate any RSpec matchers to Minitest assertions and expectations.

stubberry

Multiple stubbing ‘berries’, sweet and useful stub helpers and assertions. ( stub_must, assert_method_called, stubbing ORM objects by id )

Unknown Extensions: ↑

Authors… Please send me a pull request with a description of your minitest extension.

Minitest related goods ↑

REQUIREMENTS: ↑

INSTALL: ↑

sudo gem install minitest

On 1.9, you already have it. To get newer candy you can still install the gem, and then requiring “minitest/autorun” should automatically pull it in. If not, you’ll need to do it yourself:

gem "minitest"     # ensures you"re using the gem, and not the built-in MT
require "minitest/autorun"

# ... usual testing stuffs ...

DO NOTE: There is a serious problem with the way that ruby 1.9/2.0 packages their own gems. They install a gem specification file, but don’t install the gem contents in the gem path. This messes up Gem.find_files and many other things (gem which, gem contents, etc).

Just install minitest as a gem for real and you’ll be happier.

LICENSE: ↑

(The MIT License)

Copyright © Ryan Davis, seattle.rb

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the ‘Software’), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

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