Grails unit test cases are not working after upgrading from 1.3.7 to 2.4.4 - unit-testing

Question

I have migrated Grails from 1.3.7 to version 2.4.4. And now when I run unit test cases it fails with below reason. There are 45 plus test cases which fail with below exception:
Tests in error:
testEdit(AddressControllerTest): No signature of method: static entity.Address.get() is applicable for argument types: (null) values: [null]
My class name is AddressController.groovy
def edit = {
def quoteInstance = Quote.get( params.id )
if(!quoteInstance) {
flash.message = "Quote not found with id ${params.id}"
redirect(action:list)
}
else {
return [ quoteInstance : quoteInstance ]
}
}
And this is the before method:
#Before
public void setUp() {
super.setUp()
flash = [ : ]
AddressController.metaClass.getFlash= { -> flash }
params = [ : ]
AddressController.metaClass.getParams = { -> params }
redirectParams = [ : ]
AddressController.metaClass.'static'.redirect = { Map args ->
redirectParams = args }
renderParams= [ : ]
AddressController.metaClass.render = { Map args -> renderParams = args }
}
And the actual test case is:
#Test
public void testEdit(){
params['id'] = 123 ;
Quote.metaClass.static.get = { int id ->
assertEquals params.id, id
return null
}
QuoteController cc = new QuoteController()
cc.edit()
assertEquals 'Quote not found with id 123', flash.message
assertEquals cc.list, redirectParams.action
}
I suspect the GUnit jar class might have been change.