JMockit mock 静态块 static block

类StaticBlockService包含一个静态块，该静态块中语句执行必然报异常导致类初始化失败。

@Service
public class StaticBlockService {
    static {
    int a = 1 / 0;}public void test() {
    }
}

另一个类TestService引用StaticBlockService ，由于StaticBlockService 初始化失败，TestService也无法正常初始化。

@Service
public class TestService {
    @Resourceprivate StaticBlockService staticBlockService;public void runTest() {
    staticBlockService.test();}
}

那么，如何在UT中mock StaticBlockService 的静态块保证测试方法正确执行？

public class TestServiceTest {
    @Testedprivate TestService testService;@Injectableprivate StaticBlockService staticBlockService;@Testpublic void testTest() {
    testService.runTest();}}

解决方案如下

public class TestServiceTest {
    @Testedprivate TestService testService;@Injectableprivate StaticBlockService staticBlockService;// BeforeClass保证在加载StaticBlockService前执行before方法@BeforeClasspublic static void before() {
    new MockUp<StaticBlockService>() {
    @Mockvoid $clinit() {
    // clinit是jvm用来初始化静态变量和静态块的方法}};}@Testpublic void testTest() {
    testService.runTest();}}

即mock掉jvm执行静态块代码和初始化静态变量的clinit方法。
注意使用@BeforeClass保证在StaticBlockService初始化前即clinit方法执行前执行mock。