A `windows_feature` resource block declares the name of the Windows feature, tests if that feature is installed, and then returns information about that feature:
describe windows_feature('feature_name') do
it { should be_installed }
end
where
* `('feature_name')` must specify a Windows feature name, such as `DHCP Server` or `IIS-Webserver`
* `be_installed` is a valid matcher for this resource