使用 spock 进行单元测试 "Too few invocations"

Question

为简单起见，我们取一个非常简单的 class:

public class TestingClass {

    public void method1(){
        System.out.println("Running method 1");
        method2();
    }

    public void method2(){
        System.out.println("Running method 2");
    }
}

现在我正在编写一个简单的测试，它检查当我们调用 method1() 时，method2() 被调用：

class TestingClassSpec extends Specification {
    void "method2() is invoked by method1()"() {
        given:
        def tesingClass = new TestingClass()

        when:
        tesingClass.method1()
        then:
        1 * tesingClass.method2()
    }
}

通过执行此测试，我收到以下错误：

Running method 1 Running method 2

Too few invocations for:

1 * tesingClass.method2() (0 invocations)

为什么会出现此错误？打印的日志显示 method2() 已被调用。

Answer 1

在真实对象上测试交互时需要使用 Spy，见下文：

@Grab('org.spockframework:spock-core:0.7-groovy-2.0')
@Grab('cglib:cglib-nodep:3.1')

import spock.lang.*

class TestingClassSpec extends Specification {
    void "method2() is invoked by method1()"() {
        given:
        TestingClass tesingClass = Spy()

        when:
        tesingClass.method1()

        then:
        1 * tesingClass.method2()
    }
}

public class TestingClass {

    public void method1(){
        System.out.println("Running method 1");
        method2();
    }

    public void method2(){
        System.out.println("Running method 2");
    }
}

使用 spock 进行单元测试 "Too few invocations"

Getting "Too few invocations" on unit test with spock

spock