(Quick Reference)
                create-unit-test
Purpose
The 
create-unit-test command creates a unit test for the given base name.
Examples
grails create-unit-test org.bookstore.book
Description
Creates a unit test for the given base name. For example for a base name 
org.bookstore.book an unit test called 
BookTests will be created in the 
test/unit/org/bookstore directory.
A unit test differs from an integration test in that the Grails environment is not loaded for each test execution and it is left up to you to perform the appropriate mocking using GroovyMock or a Mock library such as 
EasyMockRefer to the section on 
Unit Testing of the user guide for information on unit vs. integration testing.
Note that this command is just for convenience and you can also create integration tests in your favourite text editor or IDE if you choose.
Usage:
grails create-unit-test [name]
Fired Events:
- CreatedFile- When the unit test is created