java – 无法弄清楚为什么验证无法正常工作

2019年8月4日 178次阅读

我有一个奇怪的测试代码,总是绿色的.同时其中一个测试不应该是绿色的.请参阅下面的代码.

这是我需要测试的课程

public class A {
    private String param;

    public void print(){
        System.out.println(this.param);
    }

    public static void printHello(){
        System.out.println("Hello!");
    }
}

并测试自己

import org.mockito.Spy;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.Test;

import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import static org.mockito.MockitoAnnotations.initMocks;
import static org.powermock.api.easymock.PowerMock.replay;
import static org.powermock.api.mockito.PowerMockito.mockStatic;
import static org.powermock.api.mockito.PowerMockito.verifyStatic;
import static org.powermock.reflect.Whitebox.invokeMethod;

public class ATest {
    @Spy
    private A a = new A();

    @BeforeMethod
    public void setUp() {
        initMocks(this);
    }

    @Test
    public void test() {

        // When
        a.print();

        // Than
        verify(a, times(1)).print();
    }

    @Test
    @PrepareForTest(A.class)
    public void testStatic() throws Exception {
        mockStatic(A.class);
        replay();
        invokeMethod(A.class, "printHello");
        verifyStatic(times(10)); // must be fail
    }
}

显然方法testStatic()应该失败,因为它不会调用10次.

UPD

这是我的新版测试

@PrepareForTest(A.class)
public class ATest extends PowerMockTestCase {

    @Spy
    private A a = new A();

    @BeforeMethod
    public void setUp() {
        initMocks(this);
    }

    @Test
    public void test() {

        // When
        a.print();

        // Than
        verify(a, times(1)).print();
    }

    @Test
    @PrepareForTest(A.class)
    public void testStatic() throws Exception {
        mockStatic(A.class);
        replay();
        invokeMethod(A.class, "printHello");
        verifyStatic(times(10)); // must be fail
    }

    @ObjectFactory
    public IObjectFactory getObjectFactory() {
        return new org.powermock.modules.testng.PowerMockObjectFactory();
    }
}

和错误堆栈跟踪

org.mockito.exceptions.verification.TooManyActualInvocations: 
a.print();
Wanted 1 time:
-> at com.aaron.simple.ATest.test(ATest.java:37)
But was 2 times. Undesired invocation:
-> at com.aaron.simple.ATest.test(ATest.java:34)

最佳答案 JUnit为每个测试方法创建一个新实例,相反,TestNG为整个套件创建一个测试实例.这意味着您的实例变量不会在测试方法之间重置.

测试应该更新实例字段,或者为Mockito重置它们(Mockito.reset(…)).

请注意,您可以在Mockito项目中找到一些TestNG utility classes,但它们尚未分发,但有助于以与JUnit相同的方式创建模拟.然而,由于模拟是使用PowerMock创建的,因此它是一个不同的故事.

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