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diff --git a/spec/functions/unique_spec.rb b/spec/functions/unique_spec.rb
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+#! /usr/bin/env ruby -S rspec
+require 'spec_helper'
+
+describe "the unique function" do
+ let(:scope) { PuppetlabsSpec::PuppetInternals.scope }
+
+ it "should exist" do
+ expect(Puppet::Parser::Functions.function("unique")).to eq("function_unique")
+ end
+
+ it "should raise a ParseError if there is less than 1 arguments" do
+ expect { scope.function_unique([]) }.to( raise_error(Puppet::ParseError))
+ end
+
+ it "should remove duplicate elements in a string" do
+ result = scope.function_unique(["aabbc"])
+ expect(result).to(eq('abc'))
+ end
+
+ it "should remove duplicate elements in an array" do
+ result = scope.function_unique([["a","a","b","b","c"]])
+ expect(result).to(eq(['a','b','c']))
+ end
+
+ it "should accept objects which extend String" do
+ class AlsoString < String
+ end
+
+ value = AlsoString.new('aabbc')
+ result = scope.function_unique([value])
+ result.should(eq('abc'))
+ end
+end