Java 如何编写单元测试用例来测试会话cookie的安全属性

我最近在一个servlet中添加了一段代码，它基本上为会话cookie添加了一个“secure”属性

   String encryptedSessionId = encryptionProxy.strongEncrypt(request.getSession().getId());
    response.setHeader("SET-COOKIE", "JSESSIONID=" + encryptedSessionId + "; secure");

我想编写一个Junit测试用例来检查会话cookie中是否添加了“secure”属性

我试图模拟会话、请求和响应对象来编写一个测试用例，但它没有按预期工作，并抛出了一个NullPointerException

我的测试用例

    @Test    
public void testMethod() {
    MockHttpServletRequest request = Mockito.mock(MockHttpServletRequest.class);
    HttpServletResponse response = Mockito.mock(HttpServletResponse.class);
    HttpSession session = new MockHttpSession(null, (String) request.getSession().getAttribute("secure"));

    //VcfoWelcomeOptInEnrollmentServlet vcfoWelcomeOptInEnrollmentServlet = Mockito.mock(VcfoWelcomeOptInEnrollmentServlet.class);

    //when(session.getAttribute("secure")).thenReturn("secure");

    //System.out.println(response.getHeader("SET-COOKIE"));

    when(response.getHeader("SET-COOKIE")).thenReturn("secure");
  }

我保持了测试用例的原样，这样您就可以了解到我迄今为止尝试过的东西

我想知道我的方法有什么问题？另外，编写成功的单元测试用例的正确方法是什么

任何帮助都将不胜感激

我正在使用JUnit4和Mockito2

错误堆栈

java.lang.NullPointerException
at com.xxx.accountLink.vcfo.client.servlet.ServletTest.testMethod(ServletTest.java:29)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:88)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
at java.lang.reflect.Method.invoke(Method.java:613)
at org.junit.internal.runners.TestMethod.invoke(TestMethod.java:68)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:316)
at org.junit.internal.runners.MethodRoadie$2.run(MethodRoadie.java:89)
at org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:97)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.executeTest(PowerMockJUnit44RunnerDelegateImpl.java:300)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTestInSuper(PowerMockJUnit47RunnerDelegateImpl.java:131)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.access$100(PowerMockJUnit47RunnerDelegateImpl.java:59)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner$TestExecutorStatement.evaluate(PowerMockJUnit47RunnerDelegateImpl.java:147)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.evaluateStatement(PowerMockJUnit47RunnerDelegateImpl.java:107)
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:288)
at org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:87)
at org.junit.internal.runners.MethodRoadie.run(MethodRoadie.java:50)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.invokeTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:208)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.runMethods(PowerMockJUnit44RunnerDelegateImpl.java:147)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$1.run(PowerMockJUnit44RunnerDelegateImpl.java:121)
at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:34)
at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:44)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.run(PowerMockJUnit44RunnerDelegateImpl.java:123)
at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.run(JUnit4TestSuiteChunkerImpl.java:121)
at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.run(AbstractCommonPowerMockRunner.java:53)
at org.powermock.modules.junit4.PowerMockRunner.run(PowerMockRunner.java:59)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)

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请提供例外情况，您正在使用的JUnit和Mockito版本，以及理想情况下可以执行的最小但完整的JUnit测试用例。测试用例中的第29行是什么？当你得到一个NPE时，很可能你没有正确初始化Mockito。请再次提供完整的TestCas，包括您如何执行以及如何初始化Mockito（Runner，Rule）的任何信息。如果您在测试用例中使用与此方法相关的任何其他Mocktio注释，请提供此信息。请提供例外情况、您使用的JUnit和Mockito版本以及理想情况下可以执行的最小但完整的JUnit测试用例。测试用例中的第29行是什么？当你得到一个NPE时，很可能你没有正确初始化Mockito。请再次提供完整的TestCas，包括您如何执行以及如何初始化Mockito（Runner，Rule）的任何信息。如果您正在测试用例中使用与此方法相关的任何其他Mocktio注释，请也提供此信息。