使用WicketTester时，访问会话属性会引发NullPointerException错误

Question

使用WicketTester时，访问会话的属性会引发NullPointerException错误。

wicket 9之前也有类似的问题：单元测试mockito httpSession

讨论建议使用

测试员。getRequest（）。getSession（）。setAttribute（“用户名”、“测试用户1”）；

而不是

测试员。getHttpSession（）。setAttribute（“用户名”、“测试用户1”）；

进行更改并未解决问题。使用wicket.apache.org/start/quickstart.html创建的完整项目可在github.com/rjngshn/WicketTesterSession找到

    public class TestHomePage
{
    private WicketTester tester;

    @BeforeEach
    public void setUp()
    {
        tester = new WicketTester(new RTApplication());
    }
// https://stackoverflow.com/questions/70258881/wicket-9-unit-testing-mockito-httpsession
    @Test
    public void userPageRendersSuccessfully()
    {
        System.out.println("Testing userPageRendersSuccessfully ");
        tester.getRequest().getSession().setAttribute("userName", "Test user 1");
        System.out.println("Uesr name in session:" + tester.getHttpSession().getAttribute("userName"));
        //start and render the test page
        tester.startPage(UserPage.class);
        //assert rendered page class
        tester.assertRenderedPage(UserPage.class);
        tester.assertModelValue("txtUserName", "Test user 1");
        System.out.println("Complete testing userPageRendersSuccessfully ");
    }
}

错误是：

 [WARN] [stderr] java.lang.NullPointerException
 [WARN] [stderr]    at uk.ac.ox.ndph.ckb.UserPage.onInitialize(UserPage.java:19)
 [WARN] [stderr]    at org.apache.wicket.Component.fireInitialize(Component.java:883)
 [WARN] [stderr]    at org.apache.wicket.MarkupContainer.internalInitialize(MarkupContainer.java:1045)

......

Answer 1

diff --git ResearchTracker/src/test/java/uk/ac/ox/ndph/ckb/TestHomePage.java ResearchTracker/src/test/java/uk/ac/ox/ndph/ckb/TestHomePage.java
index 757269f..a9df941 100644
--- ResearchTracker/src/test/java/uk/ac/ox/ndph/ckb/TestHomePage.java
+++ ResearchTracker/src/test/java/uk/ac/ox/ndph/ckb/TestHomePage.java
@@ -21,8 +21,8 @@ public class TestHomePage
     public void userPageRendersSuccessfully()
     {
         System.out.println("Testing userPageRendersSuccessfully ");
-        tester.getRequest().getSession().setAttribute("userName", "Test user 1");
-        System.out.println("Uesr name in session:" + tester.getHttpSession().getAttribute("userName"));
+        tester.getSession().setAttribute("userName", "Test user 1");
+        System.out.println("Uesr name in session:" + tester.getSession().getAttribute("userName"));
         //start and render the test page
         tester.startPage(UserPage.class);
         //assert rendered page class

您似乎混淆了Wicket会话（org.apache.Wicket.Session）和HttpSession。在测试中，您在HttpSession上设置了该属性，而在UserPage中，您试图从Wicket会话读取该属性。