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+#! /usr/bin/env ruby -S rspec
+require 'spec_helper'
+
+describe "the intersection function" do
+ let(:scope) { PuppetlabsSpec::PuppetInternals.scope }
+
+ it "should exist" do
+ Puppet::Parser::Functions.function("intersection").should == "function_intersection"
+ end
+
+ it "should raise a ParseError if there are fewer than 2 arguments" do
+ lambda { scope.function_intersection([]) }.should( raise_error(Puppet::ParseError) )
+ end
+
+ it "should return the intersection of two arrays" do
+ result = scope.function_intersection([["a","b","c"],["b","c","d"]])
+ result.should(eq(["b","c"]))
+ end
+end