Fix the tests on osx

spec/unit/puppet/parser/functions/validate_cmd_spec.rb

@@ -1,5 +1,8 @@
 require 'spec_helper'
 
+TESTEXE = File.exists?('/usr/bin/test') ? '/usr/bin/test' : '/bin/test'
+TOUCHEXE = File.exists?('/usr/bin/touch') ? '/usr/bin/touch' : '/bin/touch'
+
 describe Puppet::Parser::Functions.function(:validate_cmd) do
   let(:scope) { PuppetlabsSpec::PuppetInternals.scope }
 
@@ -19,8 +22,8 @@
   describe "on validation failure" do
     it "includes the command error output" do
       expect {
-        subject.call ['', '/bin/touch /cant/touch/this']
-      }.to raise_error Puppet::ParseError, /cannot touch/
+        subject.call ['', "#{TOUCHEXE} /cant/touch/this"]
+      }.to raise_error Puppet::ParseError, /(cannot touch|o such file or)/
     end
 
     it "includes the command return value" do
@@ -32,12 +35,12 @@
 
   describe "when performing actual validation" do
     it "can positively validate file content" do
-      expect { subject.call ["non-empty", "/usr/bin/test -s"] }.to_not raise_error
+      expect { subject.call ["non-empty", "#{TESTEXE} -s"] }.to_not raise_error
     end
 
     it "can negatively validate file content" do
       expect {
-        subject.call ["", "/usr/bin/test -s"]
+        subject.call ["", "#{TESTEXE} -s"]
       }.to raise_error Puppet::ParseError, /failed to validate.*test -s/
     end
   end