--- /dev/null
+#! /usr/bin/env ruby -S rspec
+require 'spec_helper'
+
+describe "the flatten function" do
+ let(:scope) { PuppetlabsSpec::PuppetInternals.scope }
+ it "should exist" do
+ expect(Puppet::Parser::Functions.function("flatten")).to eq("function_flatten")
+ end
+
+ it "should raise a ParseError if there is less than 1 arguments" do
+ expect { scope.function_flatten([]) }.to( raise_error(Puppet::ParseError))
+ end
+
+ it "should raise a ParseError if there is more than 1 argument" do
+ expect { scope.function_flatten([[], []]) }.to( raise_error(Puppet::ParseError))
+ end
+
+ it "should flatten a complex data structure" do
+ result = scope.function_flatten([["a","b",["c",["d","e"],"f","g"]]])
+ expect(result).to(eq(["a","b","c","d","e","f","g"]))
+ end
+
+ it "should do nothing to a structure that is already flat" do
+ result = scope.function_flatten([["a","b","c","d"]])
+ expect(result).to(eq(["a","b","c","d"]))
+ end
+end