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A Test::Unit runner that can run tests by line number.

tag: v0.0.1

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m m ci

m stands for :metal: (metal), which is a better test/unit test runner. @sferik took t so this was the next best option.

Rush is a heavy metal band. Look it up on Wikipedia.

Rush at the Bristol Colston Hall May 1979


Install via:

gem install m

m is Ruby 1.9+ only. Sorry, but method_source, sourcify, and ruby_parser all have trouble with 1.8 so I'm giving up and only supporting 1.9 for now. Patches are welcome!


Basically, I was sick of using the -n flag to grab one test to run, like RSpec's test runner works.

Given this file:

 $ cat -n test/example_test.rb
 1  require 'test/unit'
 3  class ExampleTest < Test::Unit::TestCase
 4    def test_apple
 5      assert_equal 1, 1
 6    end
 8    def test_banana
 9      assert_equal 1, 1
10    end
11  end

You can run a test by line number, using format m TEST_FILE:LINE_NUMBER_OF_TEST:

$ m test/example_test.rb:4
Run options: -n /test_apple/

# Running tests:


Finished tests in 0.000525s, 1904.7619 tests/s, 1904.7619 assertions/s.

1 tests, 1 assertions, 0 failures, 0 errors, 0 skips

Hit the wrong line number? No problem, m helps you out:

$ m test/example_test.rb:2
No tests found on line 2. Valid tests to run:

 test_apple: m test/examples/test_unit_example_test.rb:4
test_banana: m test/examples/test_unit_example_test.rb:8

Want to run the whole test? Just leave off the line number.

$ m test/example_test.rb
Run options: 

# Running tests:


Finished tests in 0.001293s, 1546.7904 tests/s, 3093.5808 assertions/s.

1 tests, 2 assertions, 0 failures, 0 errors, 0 skips

m also works with ActiveSupport::TestCase as well, so it will work great with your Rails test suites.


This gem is MIT licensed, please see LICENSE for more information.

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