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diff --git a/spec/acceptance/difference_spec.rb b/spec/acceptance/difference_spec.rb
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+++ b/spec/acceptance/difference_spec.rb
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+#! /usr/bin/env ruby -S rspec
+require 'spec_helper_acceptance'
+
+describe 'difference function', :unless => UNSUPPORTED_PLATFORMS.include?(fact('operatingsystem')) do
+ describe 'success' do
+ it 'returns non-duplicates in the first array' do
+ pp = <<-EOS
+ $a = ['a','b','c']
+ $b = ['b','c','d']
+ $c = ['a']
+ $o = difference($a, $b)
+ if $o == $c {
+ notify { 'output correct': }
+ }
+ EOS
+
+ apply_manifest(pp, :catch_failures => true) do |r|
+ expect(r.stdout).to match(/Notice: output correct/)
+ end
+ end
+ end
+ describe 'failure' do
+ it 'handles non-array arguments'
+ it 'handles improper argument counts'
+ end
+end