(puppetlabsGH-181) Add unit tests for resource like declarations

This commit adds unit tests for resource like declarations in the completion
provider.

Note that unit tests are unsed instead of integration tests as part of the push
to move many of the integration tests into unit.

spec/languageserver/unit/puppet-languageserver/manifest/completion_provider_spec.rb

@@ -0,0 +1,126 @@
+require 'spec_helper'
+
+describe 'PuppetLanguageServer::Manifest::CompletionProvider' do
+  let(:subject) { PuppetLanguageServer::Manifest::CompletionProvider }
+
+  def number_of_completion_item_with_type(completion_list, typename)
+    (completion_list.items.select { |item| item.data['type'] == typename}).length
+  end
+
+  RSpec::Matchers.define :be_completion_item_with_type do |value|
+    value = [value] unless value.is_a?(Array)
+
+    match { |actual| value.include?(actual.data['type']) }
+
+    description do
+      "be a Completion Item with a data type in the list of #{value}"
+    end
+  end
+
+  def create_mock_type(parameters = [], properties = [])
+    object = PuppetLanguageServer::Sidecar::Protocol::PuppetType.new
+    object.doc = 'mock documentation'
+    object.attributes = {}
+    parameters.each { |name| object.attributes[name] = {
+      :type        => :param,
+      :doc         => 'mock parameter doc',
+      :required? => nil,
+      :isnamevar?  => nil
+    }}
+    properties.each { |name| object.attributes[name] = {
+      :type        => :property,
+      :doc         => 'mock parameter doc',
+      :required? => nil,
+      :isnamevar?  => nil
+    }}
+
+    object
+  end
+
+  before(:all) do
+    # TODO: This shouldn't really be required, but the PuppetHelper seems to require the default types to be loaded
+    # in order to query the cache.  This is wrong.
+    wait_for_puppet_loading
+  end
+
+  before(:each) do
+    # Prepopulate the Object Cache with workspace objects
+    # Types
+    list = PuppetLanguageServer::Sidecar::Protocol::PuppetTypeList.new
+    list << create_mock_type(['param1'], ['prop1']).tap { |i| i.key = :mocktype }
+    PuppetLanguageServer::PuppetHelper.cache.import_sidecar_list!(list, :type, :workspace)
+  end
+
+  after(:each) do
+    # Clear out the Object Cache of workspace objects
+    PuppetLanguageServer::PuppetHelper::Cache::SECTIONS.each do |section|
+      PuppetLanguageServer::PuppetHelper.cache.import_sidecar_list!([], section, :workspace)
+    end
+  end
+
+  describe '#complete' do
+    # https://puppet.com/docs/puppet/latest/lang_classes.html#section-x54-1hk-xhb
+    context 'given a resource-like declaration of a resource' do
+      context 'where the title refers to a non-existant class' do
+        let(:content) { <<-EOT
+          class { 'does::not::exist':
+
+          }
+          EOT
+        }
+        let(:line_num) { 1 }
+        let(:char_num) { 0 }
+
+        it 'should return an empty completion list' do
+          result = subject.complete(content, line_num, char_num)
+          expect(result.items.count).to eq(0)
+        end
+      end
+
+      context 'with a missing title name' do
+        let(:content) { <<-EOT
+          class {
+
+          }
+          EOT
+        }
+        let(:line_num) { 1 }
+        let(:char_num) { 0 }
+
+        it 'should raise an error' do
+          expect{ subject.complete(content, line_num, char_num) }.to raise_error(RuntimeError)
+        end
+      end
+
+      context 'with a known title class' do
+        let(:content) { <<-EOT
+          class { 'mocktype':
+
+          }
+          EOT
+        }
+        let(:line_num) { 1 }
+        let(:char_num) { 0 }
+        let(:expected_types) { ['resource_parameter','resource_property'] }
+
+        it 'should return only parameter and property items' do
+          result = subject.complete(content, line_num, char_num)
+
+          result.items.each do |item|
+            expect(item).to be_completion_item_with_type(expected_types)
+          end
+        end
+
+        it 'should return the parameters of the class' do
+          result = subject.complete(content, line_num, char_num)
+          expect(number_of_completion_item_with_type(result, 'resource_parameter')).to eq(1)
+        end
+
+        it 'should return the properties of the class' do
+          result = subject.complete(content, line_num, char_num)
+          expect(number_of_completion_item_with_type(result, 'resource_property')).to eq(1)
+        end
+      end
+    end
+  end
+end