Groovy每个实例元类方法重写在Spock测试中不像预期的那样工作

Question

我有一个方法名为execute（）的类。在一些Spock单元测试中，我虚化了execute方法，并给出了一个模拟闭包，如下所示：

def setup () {
    rule = new DynamicRule ()
}

def "test default execution " (){
    given : "basic AORule "
    def mockres
    rule.metaClass.execute = {-> mockres = "did nothing"}     //mock the action
    def res = rule.execute()


    expect : "execute should do nothing "
    mockres == "did nothing"

}

如果我为此更改此测试：

    rule.metaClass.execute2 = {-> mockres = "did nothing"}     //mock the action
    def res = rule.execute2()

那么测试就通过了。

在Spock外部，我只运行了一个简单的Groovy脚本，并进行了方法重载，这就像我所期望的那样正常工作，并且该方法被关闭

class A {
    def execute () {
        println "thing"
    }
}

def c = new A()
def res
c.execute()

c.metaClass.execute  = {-> res =2 ; println "modified thing "; }

c.execute ()

println "res = "+  res

def "test default execution " (){
    given : "basic AORule "

    def mockres

    def stub = new StubFor(AORule)
    stub.demand.execute { mockres = "did nothing" }
//        rule.metaClass.execute = {-> mockres = "did nothing"}     //mock the action
//        def res = rule.execute()

    expect : "execute should do nothing "
    stub.use {
        rule.execute()
        mockres == "did nothing"

    }
}

为什么简单的per元类在Spock中不起作用？

Answer 1

这是Groovy>=2.4.3上的一个公开问题，这里是:groovy-7368。

用元类重写私有方法时存在一个错误。