Minitest + all the features you always wanted.

• Ctrl+c stops tests and prints failures
• pastable rerun snippet for failures (disabled/integrated on rails 5)
• multiple before & after blocks
• before :all blocks
• around blocks around { |t| Dir.chdir(...) { t.call } }
• red-green output (disabled/integrated on rails 5)
• mtest executable to run by line number and by folder (disabled/integrated on rails 5)
• full backtrace for errors and assertions with verbose (-v)
• let!
• let_all execute once for all tests in a class and it's subclasses
• order_dependent! to make your tests run in given order
• Maxitest.static_class_order = true no longer sort tests class/sub-classes in random order
• context for more expression
• pending { assert false } is skip when it fails, but fails when it passes
• implicit subject via require 'maxitest/implicit_subject'
• xit to skip test (also does not call setup or teardown)
• with_env to change environment variables during test run
• capture_stdout and capture_stderr to capture stdout or stderr but not both (like capture_io does)
• require 'maxitest/timeout' to make hanging tests fail after Maxitest.timeout seconds
• require 'maxitest/threads' fail tests that leave extra threads running
• require 'maxitest/global_must' (before autorun) disable deprecation on global must_* or global_expectations gem

gem install maxitest

require "maxitest/autorun"

# ... normal minitest tests ...
describe MyClass do
  describe "#my_method" do
    it "passes" do
      _(MyClass.new.my_method).must_equal 1
    end
  end
end

• pending "need to fix" do to show why something is pending
• pending "need to fix", if: ENV["CI"] do to only skip on CI (if something is supposed to work locally)

Use during test: with_env FOO: "bar do ... Use as around block: with_env FOO: "bar"

Use as alias for describe

describe "#my_method" do
  context "with bad state" do
    before { errors += 1 }
    it "fails" # ...
  end
end

output = capture_stdout { puts 1 }
_(output).must_equal "1\n"

If PR is not resolved, disable Interrupt handling with ENV["MAXITEST_NO_INTERRUPT"] = "true" to avoid "stack level too deep" errors.

• everything vendored into 1 gem to avoid dependency madness
• tested via rspec to avoid messing up our own tests by accident
• fixes should go back to the original libraries
• restrictive minitest dependency so nothing breaks by accident
• ruby >=3.0
• rake bundle to update all vendored gems

• running by line number from minitest-line
• around from minitest-around
• mtest from testrbl
• red-green from minitest-rg

Michael Grosser
michael@grosser.it
License: MIT