testunit-skill

Q: How do I install testunit-skill?

Run npx skills add https://github.com/lambdatest/agent-skills --skill testunit-skill in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/testunit-skill/ (personal) or .claude/skills/testunit-skill/ (project).

by lambdatestTesting & QA

Generates Test::Unit tests in Ruby. Classic xUnit-style testing with assert methods and test case classes. Use when user mentions "Test::Unit", "assertequal Ruby", "Ruby test-unit". Triggers on: "Test::Unit", "Ruby test-unit", "assertequal Ruby" (not RSpec).

Installs: 204
Last 24h: —
Trending rank: —
Security: Not audited

Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/lambdatest/agent-skills --skill testunit-skill

01
Install
Run the command in your project. The CLI asks which agents to install for.
02
Describe the task
Ask your agent for something this skill covers. It loads testunit-skill automatically when relevant.
03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

Test::Unit Ruby Skill

Core Patterns

Basic Test

require 'test/unit'

class TestCalculator < Test::Unit::TestCase
  def setup
    @calc = Calculator.new
  end

  def test_addition
    assert_equal(5, @calc.add(2, 3), "2 + 3 should equal 5")
  end

  def test_subtraction
    assert_equal(1, @calc.subtract(3, 2))
  end

  def test_division_by_zero
    assert_raise(ZeroDivisionError) { @calc.divide(10, 0) }
  end

  def test_float_division
    assert_in_delta(3.33, @calc.divide(10, 3), 0.01)
  end

  def teardown
    # cleanup
  end
end

Assertions

assert_equal(expected, actual, message = nil)
assert_not_equal(unexpected, actual)
assert_true(value)
assert_false(value)
assert_nil(value)
assert_not_nil(value)
assert_instance_of(klass, obj)
assert_kind_of(klass, obj)
assert_respond_to(obj, :method_name)
assert_match(/pattern/, string)
assert_no_match(/pattern/, string)
assert_include(collection, item)
assert_not_include(collection, item)
assert_empty(collection)
assert_not_empty(collection)
assert_raise(ErrorClass) { block }
assert_nothing_raised { block }
assert_in_delta(expected, actual, delta)
assert_operator(value, :>, 5)
assert_send([obj, :method, arg])
assert_block("message") { condition }

Test Fixtures

class TestDatabase < Test::Unit::TestCase
  def self.startup
    # Once before all tests in class
    @@db = Database.connect('test')
  end

  def self.shutdown
    # Once after all tests in class
    @@db.disconnect
  end

  def setup
    # Before each test
    @@db.begin_transaction
  end

  def teardown
    # After each test
    @@db.rollback
  end
end

Test Ordering and Naming

class TestUserService < Test::Unit::TestCase
  # Methods must start with 'test_'
  def test_create_user
    user = UserService.create('Alice', 'alice@test.com')
    assert_not_nil(user)
    assert_equal('Alice', user.name)
  end

  def test_find_user_by_email
    user = UserService.find_by_email('alice@test.com')
    assert_instance_of(User, user)
  end
end

Setup: `gem install test-unit`

Run: `ruby test/test_calculator.rb` or `ruby -Itest -e "Dir.glob('test/**/test_*.rb').each{|f| require f}"`

Autodiscovery: `testrb test/` (with test-unit gem)

Deep Patterns

For advanced patterns, debugging guides, CI/CD integration, and best practices, see reference/playbook.md.

FAQ

What does the testunit-skill skill do?

How do I install testunit-skill?

Run npx skills add https://github.com/lambdatest/agent-skills --skill testunit-skill in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/testunit-skill/ (personal) or .claude/skills/testunit-skill/ (project).

Which AI agents can use testunit-skill?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is testunit-skill safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains testunit-skill?

It is published by lambdatest in lambdatest/agent-skills. It has 204 recorded installs.

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