```ruby
require 'puppetlabs_spec_helper/module_spec_helper'
require 'rspec-puppet-facts'
include RspecPuppetFacts

RSpec.configure do |c|
  c.default_facts = {
    :puppetversion => ENV['PUPPET_VERSION'] || '3.7.0'
  }
end
```

Update the default puppet version set as a fact if no PUPPET_VERSION env var is found.
user
```ruby
require 'puppetlabs_spec_helper/module_spec_helper'
require 'rspec-puppet-facts'
include RspecPuppetFacts

RSpec.configure do |c|
  c.default_facts = {
    :puppetversion => ENV['PUPPET_VERSION'] || '3.7.4'
  }
end
```
assistant