Define parse_variable behavior with rspec

- Define the outlined expected behavior from parse_variable with an
  rspec that outlines the three cases we outlined for unix sockets and
  checks to be sure that we get back the TCP socket if set

Signed-off-by: Robert Marshall <rmarshall@gitlab.com>

spec/libraries/workhorse_spec.rb

+# This spec is to test the Workhorse library and whether the values parsed
+# are the ones we expect
+require 'chef_helper'
+
+RSpec.describe 'GitlabWorkhorse' do
+  let(:node) { chef_run.node }
+  let(:user_socket) { '/where/is/my/ten/mm/socket_now' }
+  let(:user_sockets_directory) { '/where/is/my/ten/mm/sockets' }
+  let(:default_sockets_directory) { '/var/opt/gitlab/gitlab-workhorse/sockets' }
+  let(:default_socket) { '/var/opt/gitlab/gitlab-workhorse/sockets/socket' }
+  let(:tcp_listen_address) { '1.9.8.4' }
+
+  before do
+    allow(Gitlab).to receive(:[]).and_call_original
+  end
+
+  context '.parse_variables' do
+    context 'listening on a tcp socket' do
+      let(:chef_run) { converge_config }
+
+      before do
+        stub_gitlab_rb(
+          gitlab_workhorse: {
+            listen_network: 'http',
+            listen_addr: tcp_listen_address
+          }
+        )
+      end
+
+      it 'uses the user configured TCP listen address' do
+        expect(node['gitlab']['gitlab-workhorse']['listen_addr']).to eq(tcp_listen_address)
+      end
+
+      it 'keeps the sockets_directory as nil' do
+        expect(node['gitlab']['gitlab-workhorse']['sockets_directory']).to eq(nil)
+      end
+    end
+
+    context 'listening on a unix socket' do
+      context 'using default configuration' do
+        let(:chef_run) { converge_config }
+
+        before do
+          stub_gitlab_rb(
+            gitlab_workhorse: {
+              listen_network: 'unix'
+            }
+          )
+        end
+
+        it 'uses the default sockets directory' do
+          expect(node['gitlab']['gitlab-workhorse']['sockets_directory']).to eq(default_sockets_directory)
+        end
+
+        it 'uses the default socket file path' do
+          expect(node['gitlab']['gitlab-workhorse']['listen_addr']).to eq(default_socket)
+        end
+      end
+
+      context 'only listen_addr is set' do
+        let(:chef_run) { converge_config }
+
+        before do
+          stub_gitlab_rb(
+            gitlab_workhorse: {
+              listen_network: 'unix',
+              listen_addr: user_socket
+            }
+          )
+        end
+
+        it 'uses the user configured listen address' do
+          expect(node['gitlab']['gitlab-workhorse']['listen_addr']).to eq(user_socket)
+        end
+
+        it 'keeps the sockets_directory as nil' do
+          expect(node['gitlab']['gitlab-workhorse']['sockets_directory']).to eq(nil)
+        end
+      end
+
+      context 'only sockets_directory is set' do
+        let(:chef_run) { converge_config }
+
+        before do
+          stub_gitlab_rb(
+            gitlab_workhorse: {
+              listen_network: 'unix',
+              sockets_directory: user_sockets_directory
+            }
+          )
+        end
+
+        it 'uses the user configured sockets directory' do
+          expect(node['gitlab']['gitlab-workhorse']['sockets_directory']).to eq(user_sockets_directory)
+        end
+
+        it 'creates a socket named socket in the user configured sockets directory' do
+          expect(node['gitlab']['gitlab-workhorse']['listen_addr']).to eq("#{user_sockets_directory}/socket")
+        end
+      end
+
+      context 'listen_addr and sockets_directory are both set' do
+        let(:chef_run) { converge_config }
+
+        before do
+          stub_gitlab_rb(
+            gitlab_workhorse: {
+              listen_network: 'unix',
+              listen_addr: user_socket,
+              sockets_directory: user_sockets_directory
+            }
+          )
+        end
+
+        it 'uses the user configured sockets directory' do
+          expect(node['gitlab']['gitlab-workhorse']['sockets_directory']).to eq(user_sockets_directory)
+        end
+
+        it 'creates a socket matching the configured listen_addr' do
+          expect(node['gitlab']['gitlab-workhorse']['listen_addr']).to eq(user_socket)
+        end
+      end
+    end
+  end
+end