Puppet::Type::Logical_volume raises an ArgumentError when the physical volume is neither string nor array Failure/Error: expect { resource = Puppet::Type.type(:logical_volume).new( name: 'john', ensure: :present, volume_group: 'ernie', size: '10M', physical_volume: 42, ) }.to raise_error(Puppet::ResourceError, 'physical_volume should be String or Array: 42') expected Puppet::ResourceError with "physical_volume should be String or Array: 42", got #<Puppet::ResourceError: Parameter physical_volume failed on Logical_volume[john]: physical_volume should be String or Array: 42> with backtrace: # ./lib/puppet/type/logical_volume.rb:126:in `block (3 levels) in <top (required)>' # ./spec/unit/type/logical_volume_spec.rb:190:in `new' # ./spec/unit/type/logical_volume_spec.rb:190:in `block (3 levels) in <top (required)>' # ./spec/unit/type/logical_volume_spec.rb:189:in `block (2 levels) in <top (required)>' # ./vendor/bundle/ruby/2.7.0/bin/rspec:23:in `load' # ./vendor/bundle/ruby/2.7.0/bin/rspec:23:in `<top (required)>' # /opt/hostedtoolcache/Ruby/2.7.8/x64/bin/bundle:23:in `load' # /opt/hostedtoolcache/Ruby/2.7.8/x64/bin/bundle:23:in `<main>'