如何在Spock中使用jmockit来测试返回多个不同值的静态方法？

import mockit.Mock
import mockit.MockUp
import org.spockframework.runtime.SpockException
import spock.lang.Specification

class MyStaticClass {
    static String getString() {
        return "Hello"
    }
}

class MyTest extends Specification {
    @Tested
    MyStaticClass myStaticClass

    def "test static method with different return values"() {
        given:
        new MockUp<MyStaticClass>() {
            @Mock
            static String getString() {
                return "World"
            }

            @Mock
            static String getString(int num) {
                if (num == 1) {
                    return "One"
                } else if (num == 2) {
                    return "Two"
                } else {
                    throw new SpockException("Invalid argument")
                }
            }
        }

        when:
        def result1 = myStaticClass.getString()
        def result2 = myStaticClass.getString(1)
        def result3 = myStaticClass.getString(2)

        then:
        result1 == "World"
        result2 == "One"
        result3 == "Two"
    }
}