Bored of create the folders and files needed to test your app ?
Get you 100% code coverage quicker !
Conjure a Shield for your app :

Auto Rails test suggestion and implementation generator. Supports both RSpec and Minitest.

Add to your Gemfile:

gem "conjure_shield"

Or install directly:

gem install conjure_shield

Then run the install generator:

rails generate conjure_shield:install

This adds the following gems to your :development, :test group and configures them:

• rspec-rails — RSpec testing framework
• rails-controller-testing — assigns / assert_template helpers
• shoulda-matchers — one-liner matchers for models
• factory_bot_rails — factory-based test data
• capybara — feature/integration tests (optional)
• database_cleaner-active_record — transactional test cleanup

The generator also:

• Runs rails generate rspec:install
• Configures Shoulda Matchers in spec/rails_helper.rb
• Configures DatabaseCleaner for both spec/support/database_cleaner.rb (RSpec) and test/test_helper.rb (Minitest)
• Replaces scaffold-generated fixture files with comments pointing to FactoryBot factories

# Analyze and generate tests
bundle exec rake conjureshield:full

# Or target a specific path
CODEBASE_PATH=/path/to/rails/app bundle exec rake conjureshield:full

# Validate Rails project setup
bundle exec rake conjureshield:validate

# Analyze codebase for missing tests
bundle exec rake conjureshield:analyze

# Generate test files (factories + skeletons)
bundle exec rake conjureshield:generate

# Check test coverage
bundle exec rake conjureshield:check_tests

# Run all tasks
bundle exec rake conjureshield:full

ConjureShield generates tests for both RSpec and Minitest when both spec/ and test/ directories exist:

Every model gets a real FactoryBot factory in spec/factories/ derived from db/schema.rb:

• Typed attributes per schema column (sequence for email/*_email fields)
• belongs_to — top-level association
• has_one / has_many / has_one_through — with_* traits
• has_and_belongs_to_many / has_many_through — with_* traits with after(:create) push
• Namespaced models — factory :admin_article, class: "Admin::Article"

All generated test files are fully commented out so they never break your suite. Each line starts with # (including ## frozen_string_literal: true). To activate a test, uncomment the lines you need (removing one #).

Model tests: validations, associations, scopes, callbacks, custom methods, serialization, delegation

Controller tests: index (pagination, sorting), show (with associations), new/edit forms, create (valid/invalid/redirect), update (valid/invalid/redirect), destroy (redirect), strong parameters (permit/deny)

Re-run the generator after adding models, controllers, associations, or columns:

bundle exec rake conjureshield:generate

• New models/controllers without a test file get commented-out skeletons
• Existing test files are never overwritten
• Factories are generated once and never overwritten on subsequent runs

# spec/factories/article.rb
FactoryBot.define do
  factory :article do
    title { "title" }
    body { "sample text" }
    published { false }

    association :author            # belongs_to

    trait :with_comments do        # has_many
      association :comments
    end

    trait :with_tags do            # has_and_belongs_to_many
      after(:create) do |article, evaluator|
        article.tags << create(:tag)
      end
    end
  end
end

## frozen_string_literal: true
#
# require "test_helper"
#
# class ArticleTest < ActiveSupport::TestCase
#   test "validates title" do
#     record = Article.new
#     record.valid?
#     assert_not record.errors[:title].empty?, "title should be validated"
#   end
# end

Uncomment the relevant lines to activate.

• Ruby >= 3.0.0
• Rails >= 7.0.0
• RSpec >= 3.12.0 (optional — Minitest works out of the box)
• Prism >= 0.29.0
• RuboCop >= 1.50.0 (with rails and rspec extensions)

MIT