Testing Command Objects in Grails 2.0

In Grails 2.0, you need to use mockCommandObject to test command objects. However, what the Grails documentation doesn’t mention is how to use the mockCommandObject method. The mockCommandObject method is located in the ControllerUnitTestMixin. To use the method, you can use the following example:

This is a little inconvenient if your class needs a lot of properties. To make things a little easier, you can mock the command object in the setup method (using JUnit’s @Before annotation), and use the default constructor (with Map support), as you would normally: