Software Test Automation

In a method of creating a custom action, a user interface is presented for entry of lines of a custom action. In response to receipt of a sub-portion of a line of the custom action via said user interface, the sub-portion is automatically checked for errors in syntax. The custom action is stored as a selectable custom action in a dynamic layer of a testing infrastructure. The dynamic layer of the testing infrastructure is associated with a particular instance of a software item.