(PDOC-5) Add spec testing for pops component

Prior to this commit there was no testing around the pops component.
Since most of the API in the pops component is private, there aren't
very many things to test, so add just a few test cases.

Additionally rename a previous spec file and make some changes to
the Gemfile.

Gemfile

@@ -8,5 +8,9 @@ group :test do
   gem 'rspec'
   gem 'mocha'
   gem 'puppetlabs_spec_helper'
-  gem 'pry'
+end
+
+group :development do
+  gem 'pry'
+  gem 'pry-debugger'
 end

spec/unit/puppetx/yardoc/pops_spec.rb

@@ -0,0 +1,43 @@
+require 'spec_helper'
+require 'puppetx/yardoc/pops/yard_statement'
+
+describe Puppetx::Yardoc::Pops do
+  let(:parser) {Puppet::Pops::Parser::Parser.new()}
+
+  describe "YARDstatement class" do
+    let(:manifest) {"#hello world\nclass foo { }"}
+    let(:model) {parser.parse_string(manifest).current.definitions.first}
+    let(:test_statement) {Puppetx::Yardoc::Pops::YARDStatement.new(model)}
+
+    describe "when creating a new instance of YARDStatement" do
+      it "should raise an error if the argument is not a PopsObject" do
+        test_arg = 'foo bar'
+        expect{Puppetx::Yardoc::Pops::YARDStatement.new(test_arg)}.to raise_error(ArgumentError)
+      end
+
+      it "should extract comments from the source code" do
+        expect(test_statement.comments).to match(/^#hello world/)
+      end
+    end
+  end
+
+  describe "YARDTransfomer class" do
+    let(:manifest) {"#hello world\nclass foo($bar) { }"}
+    let(:manifest_default) {"#hello world\nclass foo($bar = 3) { }"}
+    let(:transformer) {Puppetx::Yardoc::Pops::YARDTransformer.new}
+
+     describe "transform method" do
+       it "should perform the correct transformation with parameter defaults" do
+        model = parser.parse_string(manifest_default).current.definitions.first
+        statements = transformer.transform(model)
+        expect(statements.parameters[0][0].class).to be(Puppetx::Yardoc::Pops::YARDStatement)
+       end
+
+       it "should perform the correct transofmration without parameter defaults" do
+        model = parser.parse_string(manifest).current.definitions.first
+        statements = transformer.transform(model)
+        expect(statements.parameters[0][1].class).to be(NilClass)
+       end
+    end
+  end
+end