带参数的Groovy模拟Java类

class MyJavaClass {
   private MyObject myObj
   public MyJavaClass(MyObject myObj) {
      this.myObj = myObj;
   }
}

class MyGroovyTest {
    @Test
    void testMyJavaClass() {
        def mock = new MockFor(MyJavaClass)
        MyJavaClass mjc = new MyJavaClass()
        def mockProxy = mock.proxyDelegateInstance([mjc] as Object[])
        // if I pass mockProxy to anything,I get an error that a matching 
        // constructor could not be found. I've tried variations on the args 
        // to proxyDelegateInstance (such as using mjc as a single arg rather than 
        // an array of one element)
    }

}

我能在groovy中实际做到这一点吗？如果是这样,我该怎么办呢？

谢谢,
杰夫