1. First step of the test-unit ↑

Let’s getting start test-unit.

This document creates an example gem package called sample with the test-unit testing framework.

2. Install bundler and test-unit. ↑

<s>~ !!!plain gem install bundler gem install test-unit </s>~

The gem list command output installed packages. You will find the following lines.

<s>~ !!!plain gem list … bundler (1.14.6) … test-unit (3.2.3) </s>~

3. Create gem template. ↑

Next, create a gem template using bundler command. This command generates package skeleton with a testing framework. However, this command can’t generate test templates for test-unit.

So, First create gem template with the minitest testing framework. (It’s similar to unit-test). After that, replace some files for test-unit.

The bundle gem -t minitest sample command will generate the following files.

<s>~ !!!plain . |– Gemfile |– README.md |– Rakefile |– bin | |– console | -- setup |-- lib | |-- sample | |– version.rb | -- sample.rb |-- sample.gemspec # <- Modify – test |– sample_test.rb # <- Modify ‘– test_helper.rb # <- Modify </s>~

4. Edit files for test-unit ↑

4.1. Edit gemspec ↑

Edit sample.gemspec like the below. Replace minitest line to test-unit.

Before

<s>~ !!!ruby spec.add_development_dependency “minitest”, “~> 5.0” </s>~

After

<s>~ !!!ruby spec.add_development_dependency “test-unit”, “~> 3.2.3” </s>~

4.2. Edit test/test_helper.rb ↑

Next, edit the test/test_helper.rb file.

Before

~~~ !!!ruby $LOAD_PATH.unshift File.expand_path(‘../../lib’, FILE) require ‘sample’

require ‘minitest/autorun’ # <– Modify this line. ~~~

After

~~~ !!!ruby $LOAD_PATH.unshift File.expand_path(‘../../lib’, FILE) require ‘sample’

require ‘test/unit’ # <– After modification. ~~~

4.3 Rakefile (No edit) ↑

This file doesn’t need to modify. The output is the below.

~~~ !!!ruby require “bundler/gem_tasks” require “rake/testtask”

Rake::TestTask.new(:test) do |t| t.libs << “test” t.libs << “lib” t.test_files = FileList end

task :default => :test ~~~

4.4 Edit test/sample_test.rb ↑

The bundler generate the file test/sample_test.rb. This file originally templates for minitest.

Let’s modify this file for test-unit

before

~~~ !!!ruby require ‘test_helper’

class SampleTest < Minitest::Test # <- Modify here def test_that_it_has_a_version_number refute_nil ::Sample::VERSION end

def test_it_does_something_useful assert false end end ~~~

After

~~~ !!!ruby require ‘test_helper’

class SampleTest < Test::Unit::TestCase # <- After modification def test_that_it_has_a_version_number refute_nil ::Sample::VERSION end

def test_it_does_something_useful assert false end end ~~~

5. Execute test. ↑

The rake test command execute test scenarios in the test directory. Now it tries to two tests. One will success the other one fails.

~~~ !!!plain rake test Loaded suite /path/to/ruby/lib/ruby/gems/2.3.0/gems/rake-12.0.0/lib/rake/rake_test_loader Started

F ↑

Failure: <false> is not true. test_it_does_something_useful(SampleTest) /path/to/sample/test/sample_test.rb:9:in ‘test_it_does_something_useful’ 6: end 7: 8: def test_it_does_something_useful => 9: assert false 10: end

 11: end

================================================================================ .

Finished in 0.011521 seconds. ↑

2 tests, 2 assertions, 1 failures, 0 errors, 0 pendings, 0 omissions, 0 notifications

50% passed ↑

173.60 tests/s, 173.60 assertions/s rake aborted! Command failed with status (1)

Tasks: TOP => test (See full trace by running task with –trace) ~~~

6. Create original tests. ↑

Let’s create your original tests with the following rules.

Example directory layout.

<s>~ !!!plain test |– sample_test.rb |– sub | -- sample2_test.rb – test_helper.rb </s>~

Example test file in the sub directory.

~~~ !!!ruby require ‘test_helper’

module Sub class Sample2Test < Test::Unit::TestCase def test_that_it_has_a_version_number refute_nil ::Sample::VERSION end

def test_it_does_something_useful
  assert false
end

end end ~~~

7. For more inforomation ↑

Let’s read the official document.