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Simplecov::Tdd

A SimpleCov formatter for test driven development. Displays code coverage results in the console for single files

Example TDD

Installation

Add this line to your application's Gemfile:

gem 'simplecov-tdd'

And then execute:

$ bundle

Or install it yourself as:

$ gem install simplecov-tdd

Usage

  1. Ensure that you've configured your project to SimpleCov's Getting Started section: https://github.com/colszowka/simplecov#getting-started
  2. Set your SimpleCov configuration to the following:
require "simplecov/tdd"
SimpleCov.formatter = Simplecov::Formatter::Tdd
# OR use multi-formatter
SimpleCov.formatters = SimpleCov::Formatter::MultiFormatter.new([
  SimpleCov::Formatter::HTMLFormatter,
  Simplecov::Formatter::Tdd
])

Simple Setup:

# /spec/spec_helper.rb
require "simplecov"
require "simplecov/tdd"
SimpleCov.formatter = SimpleCov::Formatter::Tdd
SimpleCov.start 'rails'
  1. Run your tests using rspec path/to/file_spec.rb or guard
  2. Fix the missing coverage
  3. 💰 Profit! 💰

Configuration options

There are a few configuration options that may be set before formatting is called. Generally you may place these after SimpleCov.formatter or SimpleCov.formatters = SimpleCov::Formatter::MultiFormatter.new in your setup.

output_style (default: :simple)

When there are lines missing coverage, this option determines how to display output. The accepted values are :simple (default) or :verbose.

SimpleCov::Formatter::Tdd.output_style = :verbose

Here's an example of what :verbose output looks like:

app/models/matched_90.rb
90.0% coverage, 167 total lines

The following 2 lines have missing coverage:
[5, 25]

line | source code
-------------------
5 => obj.is_a?(SomeClass)
25 => SomeClass.explode!

debug_mode (default: false)

This is useful for determining if the current file being tested doesn't have a match from SimpleCov's file list.

SimpleCov::Formatter::Tdd.debug_mode = true

Future Features

  • Support for minitest

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/joshmfrankel/simplecov-tdd. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

Code of Conduct

Everyone interacting in the Simplecov::Tdd project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.

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A SimpleCov formatter for test driven development

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