Disabling code coverage for guard spec runs

Question

For a variety of reasons, I find that running code coverage every time my files reload from guard is quite a burden. However, there doesn't seem to be a way to conditionally prevent SimpleCov from starting from the spec helper.

Is there a way to disable SimpleCov when run by guard, but not when I run it normally using rake spec?

Answer 1

I ultimately found this solution:

1. Add an environment variable in your Guardfile:

   guard :rspec, env: { 'NO_COVERAGE' => 'true' }

2. Check for it from the spec helper:

   SimpleCov.start :rails unless ENV["NO_COVERAGE"]

Answer 2

In your spec helper:

unless ARGV.any? {|e| e =~ /guard-rspec/ }
  SimpleCov.start
end

The idea here is that guard-rspec invokes rspec with a special guard-rspec formatter. Looking for that on the command line given gives you the hint that it was invoked from Guard, so you can just skip SimpleCov if that's there.