Add tests

The test sets an ip address, uses language to indicate it should end up
in quotes.

spec/acceptance/server/config_entry_spec.rb

@@ -23,4 +23,22 @@ describe 'postgresql::server::config_entry:', :unless => UNSUPPORTED_PLATFORMS.i
       expect(r.stderr).to eq('')
     end
   end
+
+  it 'should correctly set a quotes-required string' do
+    pp = <<-EOS.unindent
+      class { 'postgresql::server': }
+
+      postgresql::server::config_entry { 'listen_addresses':
+        value => '0.0.0.0',
+      }
+    EOS
+
+    apply_manifest(pp, :catch_failures => true)
+
+    psql('--command="show all" postgres') do |r|
+      r.stdout.should =~ /listen_adresses.+0\.0\.0\.0/
+      r.stderr.should be_empty
+      r.exit_code.should == 0
+    end
+  end
 end