How can I overwrite a method's logic when using mockDomain in grails?

问题

I would like to mock a domain with everything as usual (mockDomain(Class)), but I would like to overwrite one of the domain's methods (beforeDelete to be specific) with custom logic just for that one unit test.

How can this be achieved?

回答1:

You can override the beforeDelete method on your domain class using Groovy metaClass.

Domain class:

class Person {
  String name
  boolean deleted

  def beforeDelete() {
    println "Deleting Person ${id}"
    deleted = true
    return false
  }
}

Unit Test:

void testBeforeDelete() {
    mockDomain(Person)
    def p = new Person(name:"test")
    p.save()
    assertEquals false, p.deleted
    p.delete()
    assertEquals true, p.deleted
}

--Output from testBeforeDelete--

Deleting Person 1

void testBeforeDeleteOverrideBeforeDelete() {
    mockDomain(Person)
    Person.metaClass.'static'.beforeDelete = {println 'Do not touch me'}
    def p = new Person(name:"test")
    p.save()
    assertEquals false, p.deleted
    p.delete()
    assertEquals true, p.deleted
}

--Output from testBeforeDeleteOverrideBeforeDelete--

Do not touch me

回答2:

Mock the domain class with mockDomain as usual, then mock the beforeDelete closure with mockFor in that one specific unit test. For example:

void testDelete() {
    mockDomain(MyDomainClass)
    def myDomainClassControl = mockFor(MyDomainClass)
    myDomainClassControl.demand.beforeDelete(1..1) { -> println "hello world" }

    ... // test delete

    myDomainClassControl.verify()
}

来源：https://stackoverflow.com/questions/5887177/how-can-i-overwrite-a-methods-logic-when-using-mockdomain-in-grails