(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
grails create-unit-test book
grails create-unit-test org.bookstore.Book
Description
Creates a unit test for the given base name. The argument is optional, but if you don't include it the command will ask you for the name of the controller.
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 
GMock or 
EasyMockRefer to the section on 
Unit Testing of the user guide for information on unit vs. integration testing.
The name of the test can include a Java package, such as 
org.bookstore in the final example above, but if one is not provided a default is used. So the second example will create the file 
test/integration/<appname>/BookSpec.groovy whereas the last one will create 
test/integration/org/bookstore/BookSpec.groovy directory. Note that the first letter of the test name is always upper-cased when determining the class name.
If you want the command to default to a different package for tests, provide a value for 
grails.project.groupId in the 
runtime configuration.
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