Install the group in the spec recipe

Signed-off-by: Tim Smith <tsmith@chef.io>

spec/fixtures/cookbooks/ark_spec/recipes/default.rb

@@ -11,7 +11,12 @@ ruby_block 'test_notification' do
   action :nothing
 end
 
-user 'foobarbaz'
+group 'foobarbaz'
+
+user 'foobarbaz' do
+  group 'foobarbaz'
+end
+
 
 directory '/opt/bin' do
   recursive true