(Quick Reference)
                test-app
Purpose
Runs all Grails unit and integration tests and generates reports. The command returns appropriate response codes for embedding with continuous integration servers.
Examples
grails test-app
grails test-app Foo
grails test-app Foo Bar
Description
Usage:
grails [environment]* test-app [names]*
Fired Events:
- StatusFinal- When the test cycle completes
Executes the Grails unit and integration tests located in the 
test/unit and 
test/integration directories. By default all tests are executed, but you can specify the names of the tests (without the "Tests" or other test type suffix) as argument to the command:
grails test-app Foo
grails test-app Foo Bar
The first example will execute a test called 
FooTests.groovy whilst the second will execute 
FooTests.groovy and 
BarTests.groovy if they exist.
Tests can also use the suffix of Test instead of Tests.
You can also choose to only run the unit or integration tests:
grails test-app -unit
grails test-app -integration
If you only wish to re-run failed tests use the -rerun flag
See the 
Testing section for examples on how to combine the different options to target tests.