SimpleCov::Formatter::Terminal

Note: This gem depends upon RSpec. If you aren't using RSpec to run your tests, it won't work!

Add the gem to your application's Gemfile.

group :test do
  gem 'simple_cov-formatter-terminal'
end

Then execute:

$ bundle install

Add something like the following to your spec/spec_helper.rb file:

require 'simplecov'
if RSpec.configuration.files_to_run.one?
  require 'simple_cov/formatter/terminal'
  SimpleCov.formatter = SimpleCov::Formatter::Terminal
end
SimpleCov.start

Note that this setup only uses SimpleCov::Formatter::Terminal when specs are run with a single spec file (e.g. bin/rspec spec/models/user_spec.rb) and not when multiple specs are executed (e.g. when simply running bin/rspec without any argument).

By default, only uncovered lines will be printed.

If you would like to print all lines, add this to your spec_helper.rb file:

SimpleCov::Formatter::Terminal.config.lines_to_print = :all

SimpleCov::Formatter::Terminal has a default hash that is used to map spec files to their corresponding application file.

For gems (determined from whether there is a .gemspec file at the top level of the project), the default mapping is very simple:

SimpleCov::Formatter::Terminal.config.spec_to_app_file_map = {
  %r{\Aspec/} => 'lib/',
}

This is the default used for non-gems; it is optimized for Rails applications using Active Admin:

SimpleCov::Formatter::Terminal.config.spec_to_app_file_map = {
  %r{\Aspec/lib/} => 'lib/',
  %r{\Aspec/controllers/admin/(.*)_controller_spec.rb} => 'app/admin/\1.rb',
  %r{
    \Aspec/
    (
    actions|
    channels|
    controllers|
    decorators|
    helpers|
    mailboxes|
    mailers|
    models|
    policies|
    serializers|
    views|
    workers
    )
    /
  }x => 'app/\1/',
}

If needed for your application, you can add to this hash in your spec/spec_helper.rb, e.g.:

SimpleCov::Formatter::Terminal.config.spec_to_app_file_map.merge!(
  %r{\Aspec/my_special/directory_structure/} => 'my_special/app_directory/',
)

Or you can override the default mapping completely:

SimpleCov::Formatter::Terminal.config.spec_to_app_file_map = {
  %r{\Aspec/my_special/directory_structure/} => 'my_special/app_directory/',
}

An alternative to using the spec_to_app_file_map configuration is to set a SIMPLECOV_TARGET_FILE environment variable.

If you enable branch coverage for SimpleCov (via enable_coverage(:branch) within your SimpleCov.start block; read more here), then branch coverage info will be included in SimpleCov::Formatter::Terminal's output. Missed branches will be indicated with white text on a red background at the end of the line, and the line number will be printed in red text on a yellow background, as seen in the screenshot at the top of this README (where a then branch is not covered on line 18).

If you set a SIMPLECOV_TERMINAL_HYPERLINK_PATTERN, then SimpleCov::Formatter::Terminal will attempt to print the line numbers in its display as hyperlinks to the relevant line of code.

The pattern can/should include these interpolation markers:

• %f - This will be replaced with the absolute path of the application file.
• %l - This will be replaced with the line number.

For example, this pattern will work to make the line numbers clickable links that open the appropriate file at the appropriate line in VS Code:

SIMPLECOV_TERMINAL_HYPERLINK_PATTERN="vscode://file/%f:%l"

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

Bug reports and pull requests are welcome on GitHub at https://github.com/davidrunger/simple_cov-formatter-terminal.

The gem is available as open source under the terms of the MIT License.