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, 13 insertions, 52 deletions

diff --git a/spec/functions/validate_string_spec.rb b/spec/functions/validate_string_spec.rb
index 3b4fb3e..f0c500e 100755
--- a/spec/functions/validate_string_spec.rb
+++ b/spec/functions/validate_string_spec.rb
@@ -1,60 +1,21 @@
-#! /usr/bin/env ruby -S rspec
-
 require 'spec_helper'
 
-describe Puppet::Parser::Functions.function(:validate_string) do
-  let(:scope) { PuppetlabsSpec::PuppetInternals.scope }
-
-  describe 'when calling validate_string from puppet' do
-
-    %w{ foo bar baz }.each do |the_string|
-
-      it "should compile when #{the_string} is a string" do
-        Puppet[:code] = "validate_string('#{the_string}')"
-        scope.compiler.compile
-      end
-
-      it "should compile when #{the_string} is a bare word" do
-        Puppet[:code] = "validate_string(#{the_string})"
-        scope.compiler.compile
-      end
-
-    end
-
-    %w{ true false }.each do |the_string|
-      it "should compile when #{the_string} is a string" do
-        Puppet[:code] = "validate_string('#{the_string}')"
-        scope.compiler.compile
-      end
-
-      it "should not compile when #{the_string} is a bare word" do
-        Puppet[:code] = "validate_string(#{the_string})"
-        expect { scope.compiler.compile }.to raise_error(Puppet::ParseError, /is not a string/)
-      end
-    end
-
-    it "should compile when multiple string arguments are passed" do
-      Puppet[:code] = <<-'ENDofPUPPETcode'
-        $foo = ''
-        $bar = 'two'
-        validate_string($foo, $bar)
-      ENDofPUPPETcode
-      scope.compiler.compile
-    end
+describe 'validate_string' do
+  describe 'signature validation' 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 "should compile when an explicitly undef variable is passed (NOTE THIS MAY NOT BE DESIRABLE)" do
-      Puppet[:code] = <<-'ENDofPUPPETcode'
-        $foo = undef
-        validate_string($foo)
-      ENDofPUPPETcode
-      scope.compiler.compile
+    describe 'valid inputs' do
+      it { is_expected.to run.with_params('') }
+      it { is_expected.to run.with_params('one') }
+      it { is_expected.to run.with_params('one', 'two') }
     end
 
-    it "should compile when an undefined variable is passed (NOTE THIS MAY NOT BE DESIRABLE)" do
-      Puppet[:code] = <<-'ENDofPUPPETcode'
-        validate_string($foobarbazishouldnotexist)
-      ENDofPUPPETcode
-      scope.compiler.compile
+    describe 'invalid inputs' do
+      it { is_expected.to run.with_params([]).and_raise_error(Puppet::ParseError, /is not a string/) }
+      it { is_expected.to run.with_params({}).and_raise_error(Puppet::ParseError, /is not a string/) }
+      it { is_expected.to run.with_params(1).and_raise_error(Puppet::ParseError, /is not a string/) }
+      it { is_expected.to run.with_params(true).and_raise_error(Puppet::ParseError, /is not a string/) }
     end
   end
 end