测试创建不同 class 对象的私有 void 方法

Question

我正在尝试测试创建不同 class 对象的私有 void 方法之一。

目前该段代码抛出空指针异常。是不是因为SendMail class 的对象没有被mock 导致的错误？

要测试的方法 -

private void sendActivationCode(MailInfoDTO mailInfoBn) throws SystemException {
        **SendMail sm = new SendMail();**
        try {
            sm.setTo(mailInfoBn.getMailTo());
            sm.setFrom(mailInfoBn.getMailFrom());
            sm.setMailHost(PropertiesHelper.getProperty("smtp_server"));
            sm.setPopServerHost(PropertiesHelper.getProperty("smtp_server"));
            sm.setRequireAuth(true);
            sm.setPopUserName(PropertiesHelper.getProperty("smtp_auth_user"));
            sm.setPopPassword(PropertiesHelper.getProperty("smtp_auth_pass"));
            sm.setMessageBody(mailInfoBn.getMessageBody());
            sm.setSubject(mailInfoBn.getMessageSubject());
            sm.setDebug(false);
            sm.setKeepCopyInOS(false);
            sm.sendSMTP();
        } catch (Exception ex) {
            throw new SystemException(ex);
        }
    }

测试 class 片段 -

ProfileNotificationBO profileNotificationBOSpy = PowerMockito.spy(profileNotificationBO);
            PowerMockito.doNothing().when(profileNotificationBOSpy, "sendActivationCode", Mockito.any(MailInfoDTO.class));

堆栈跟踪 -

junit.framework.AssertionFailedError: Failed with following error: com.common.exceptions.SystemException: java.lang.NullPointerException
at com.profile.api.bo.ProfileNotificationBO.sendActivationCode(ProfileNotificationBO.java:791)
at org.powermock.reflect.internal.WhiteboxImpl.performMethodInvocation(WhiteboxImpl.java:1873)
at org.powermock.reflect.internal.WhiteboxImpl.doInvokeMethod(WhiteboxImpl.java:773)
at org.powermock.reflect.internal.WhiteboxImpl.invokeMethod(WhiteboxImpl.java:638)
at org.powermock.reflect.Whitebox.invokeMethod(Whitebox.java:401)
at org.powermock.api.mockito.internal.expectation.PowerMockitoStubberImpl.when(PowerMockitoStubberImpl.java:93)
at com.profile.api.bo.TestProfileNotificationBO.testGenerateActivationCodeWhenMblNotRegistered(TestProfileNotificationBO.java:1148)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:310)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.executeTest(PowerMockJUnit44RunnerDelegateImpl.java:294)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTestInSuper(PowerMockJUnit47RunnerDelegateImpl.java:127)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTest(PowerMockJUnit47RunnerDelegateImpl.java:82)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runBeforesThenTestThenAfters(PowerMockJUnit44RunnerDelegateImpl.java:282)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.invokeTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:207)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.runMethods(PowerMockJUnit44RunnerDelegateImpl.java:146)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.run(PowerMockJUnit44RunnerDelegateImpl.java:120)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.run(PowerMockJUnit44RunnerDelegateImpl.java:122)
at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.run(JUnit4TestSuiteChunkerImpl.java:106)
at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.run(AbstractCommonPowerMockRunner.java:53)
at org.powermock.modules.junit4.PowerMockRunner.run(PowerMockRunner.java:59)
Caused by: java.lang.NullPointerException
at com.profile.api.bo.ProfileNotificationBO.sendActivationCode(ProfileNotificationBO.java:778)

at com.profile.api.bo.TestProfileNotificationBO.testGenerateActivationCodeWhenMblNotRegistered(TestProfileNotificationBO.java:1166)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:310)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.executeTest(PowerMockJUnit44RunnerDelegateImpl.java:294)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTestInSuper(PowerMockJUnit47RunnerDelegateImpl.java:127)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTest(PowerMockJUnit47RunnerDelegateImpl.java:82)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runBeforesThenTestThenAfters(PowerMockJUnit44RunnerDelegateImpl.java:282)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.invokeTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:207)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.runMethods(PowerMockJUnit44RunnerDelegateImpl.java:146)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.run(PowerMockJUnit44RunnerDelegateImpl.java:120)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.run(PowerMockJUnit44RunnerDelegateImpl.java:122)
at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.run(JUnit4TestSuiteChunkerImpl.java:106)
at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.run(AbstractCommonPowerMockRunner.java:53)
at org.powermock.modules.junit4.PowerMockRunner.run(PowerMockRunner.java:59)

Answer 1

问题已通过删除不必要的代码段得到解决。

ProfileNotificationBO profileNotificationBOSpy = PowerMockito.spy(profileNotificationBO);
PowerMockito.doNothing().when(profileNotificationBOSpy, "sendActivationCode", Mockito.any(MailInfoDTO.class));

需要模拟 SendMail class 才能通过测试用例。

测试创建不同 class 对象的私有 void 方法

Test a private void method which creates an object of different class

java

junit

mockito

powermock