Grails unit testing not working - NoClassDefFoundError: junit/framework/TestCase

I am running a test on the User domain I created according to instructions in the book: "Grails in Action". Here is the code for the test

package com.grailsinaction

import grails.test.*

class UserIntegrationTests extends GrailsUnitTestCase {
    void testFirstSaveEver() {
        def user = new User( userId: 'johnny', password: 'secret',
            homepage: 'http://ift.tt/1CBEcPU' )
        assertNotNull user.save()
        assertNotNull user.id

        def foundUser = User.get( user.id )
        assertEquals 'joe', foundUser.userId
    }
}

I run the code inside console after the grails console command and it raised an error:

java.lang.NoClassDefFoundError: junit/framework/TestCase

My code doesn't make use of the TestCase class referred to in the error message. Is there a problem in my dependency?