Convert tests to use plain rspec-puppet

Tests in the new style produces the following documentation output:

abs
  should not eq nil
  should run abs() and raise an Puppet::ParseError
  should run abs(-34) and return 34
  should run abs("-34") and return 34
  should run abs(34) and return 34
  should run abs("34") and return 34

1 files changed, 9 insertions, 19 deletions

diff --git a/spec/functions/parseyaml_spec.rb b/spec/functions/parseyaml_spec.rb
index e5f145b..fb635f8 100755
--- a/spec/functions/parseyaml_spec.rb
+++ b/spec/functions/parseyaml_spec.rb
@@ -1,24 +1,14 @@
-#! /usr/bin/env ruby -S rspec
 require 'spec_helper'
 
-describe "the parseyaml function" do
-  let(:scope) { PuppetlabsSpec::PuppetInternals.scope }
-
-  it "should exist" do
-    expect(Puppet::Parser::Functions.function("parseyaml")).to eq("function_parseyaml")
-  end
-
-  it "should raise a ParseError if there is less than 1 arguments" do
-    expect { scope.function_parseyaml([]) }.to( raise_error(Puppet::ParseError))
+describe 'parseyaml' do
+  it { is_expected.not_to eq(nil) }
+  it { is_expected.to run.with_params().and_raise_error(Puppet::ParseError, /wrong number of arguments/i) }
+  it { is_expected.to run.with_params('', '').and_raise_error(Puppet::ParseError, /wrong number of arguments/i) }
+  it { is_expected.to run.with_params('["one", "two", "three"]').and_return(['one', 'two', 'three']) }
+  context 'when running on modern rubies', :unless => RUBY_VERSION == '1.8.7' do
+    it { is_expected.to run.with_params('["one"').and_raise_error(Psych::SyntaxError) }
   end
-
-  it "should convert YAML to a data structure" do
-    yaml = <<-EOS
-- aaa
-- bbb
-- ccc
-EOS
-    result = scope.function_parseyaml([yaml])
-    expect(result).to(eq(['aaa','bbb','ccc']))
+  context 'when running on ruby 1.8.7, which does not have Psych', :if => RUBY_VERSION == '1.8.7' do
+    it { is_expected.to run.with_params('["one"').and_raise_error(ArgumentError) }
   end
 end