Rspec skill

Skill Pyfagorass/bookofspells/skills/lambdatest/rspec-skill

📖 The Book of Spells: a curated, enchanted index of real LLM tooling — and a pipeline that gathers SKILL.md skills from many houses into one searchable shelf.

Install

npx -y skills add Pyfagorass/bookofspells --skill rspec-skill

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What its author says it does

Copied from the file, not written here

Generates RSpec tests in Ruby with describe/context/it blocks, matchers, let/before hooks, and mocking. Use when user mentions "RSpec", "describe do", "expect().to", "Ruby test". Triggers on: "RSpec", "expect().to eq()", "describe do", "Ruby test", "spec file".

The file declares its own license as MIT. That is the author’s claim about this one file, and it is not the same thing as the license GitHub reports for the repository, which is listed with the other numbers below.

SKILL.md

3.8 KB, as published. Nobody here has run it

RSpec Testing Skill

Core Patterns

Basic Test

RSpec.describe Calculator do
  subject(:calculator) { described_class.new }

  describe '#add' do
    it 'adds two positive numbers' do
      expect(calculator.add(2, 3)).to eq(5)
    end

    it 'handles negative numbers' do
      expect(calculator.add(-1, 1)).to eq(0)
    end
  end

  describe '#divide' do
    it 'divides evenly' do
      expect(calculator.divide(10, 2)).to eq(5)
    end

    it 'raises on zero divisor' do
      expect { calculator.divide(10, 0) }.to raise_error(ZeroDivisionError)
    end
  end
end

Matchers

# Equality
expect(actual).to eq(expected)           # ==
expect(actual).to eql(expected)          # eql?
expect(actual).to equal(expected)        # equal? (same object)
expect(actual).to be(expected)           # equal?

# Comparison
expect(value).to be > 5
expect(value).to be_between(1, 10).inclusive

# Truthiness
expect(value).to be_truthy
expect(value).to be_falsey
expect(value).to be_nil

# Collections
expect(array).to include(3)
expect(array).to contain_exactly(1, 2, 3)
expect(array).to match_array([3, 1, 2])
expect(hash).to include(name: 'Alice')

# Strings
expect(str).to include('hello')
expect(str).to start_with('He')
expect(str).to match(/\d+/)

# Types
expect(obj).to be_a(String)
expect(obj).to be_an_instance_of(MyClass)

# Exceptions
expect { method }.to raise_error(StandardError)
expect { method }.to raise_error(StandardError, /message/)

# Change
expect { user.activate }.to change(user, :active).from(false).to(true)
expect { list.push(1) }.to change(list, :size).by(1)

Hooks and Let

RSpec.describe UserService do
  let(:repo) { instance_double(UserRepository) }
  let(:service) { described_class.new(repo) }

  before(:each) do
    allow(repo).to receive(:save).and_return(true)
  end

  after(:each) { cleanup }
  before(:all) { setup_database }
  after(:all) { teardown_database }

  context 'when creating a user' do
    it 'saves to repository' do
      service.create('Alice', '[email protected]')
      expect(repo).to have_received(:save).once
    end
  end
end

Mocking and Stubbing

# Doubles
user = double('User', name: 'Alice', email: '[email protected]')
user = instance_double(User, name: 'Alice')

# Stubs
allow(service).to receive(:fetch).and_return(data)
allow(service).to receive(:fetch).with('id').and_return(user)

# Expectations
expect(service).to receive(:save).once
expect(service).to receive(:notify).with('[email protected]')
expect(service).not_to receive(:delete)

Shared Examples

RSpec.shared_examples 'a valid model' do
  it { is_expected.to be_valid }
  it { is_expected.to respond_to(:save) }
end

RSpec.describe User do
  subject { described_class.new(name: 'Alice') }
  it_behaves_like 'a valid model'
end

Anti-Patterns

Bad	Good	Why
`before` with heavy setup	`let` (lazy)	Only evaluates when used
No contexts	`context 'when...'`	Clear scenarios
Instance variables	`let` blocks	Cleaner, lazier
`should` syntax	`expect().to`	Modern RSpec

Setup: `gem install rspec` then `rspec --init`

Run: `bundle exec rspec` or `rspec spec/models/user_spec.rb`

Config: `.rspec` file with `--format documentation --color`

Deep Patterns

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