Why my unit test is giving me an AssertionFailedError when I try to render another page

I am learning unit testing and trying to check if the login is valid on the HomePage and if so that the SuccessPage is rendered but it is giving me an AssertionFailedError

.java:

    @Test
    public void validLogin(){
        tester.startPage(HomePage.class);

        FormTester form = tester.newFormTester("userForm");
        form.setValue("username", "emile");
        form.setValue("password", "123");
        form.submit();
        //onsubmit the Successpage is rendered in response
        tester.assertRenderedPage(SuccessPage.class);

    }

the error:

[main] INFO org.apache.wicket.Application - [WicketTesterApplication-768a67f4-8bf1-45d0-bdcb-3a9be18172e1] init: Wicket core library initializer
[main] INFO org.apache.wicket.Application - [WicketTesterApplication-768a67f4-8bf1-45d0-bdcb-3a9be18172e1] init: Wicket extensions initializer
[main] INFO org.apache.wicket.Application - [WicketTesterApplication-768a67f4-8bf1-45d0-bdcb-3a9be18172e1] init: Wicket jQuery UI initializer
[main] INFO org.apache.wicket.Application - [WicketTesterApplication-768a67f4-8bf1-45d0-bdcb-3a9be18172e1] init: Wicket jQuery UI initializer (theme-uilightness)
ERROR StatusLogger Log4j2 could not find a logging implementation. Please add log4j-core to the classpath. Using SimpleLogger to log to the console...

junit.framework.AssertionFailedError: classes not the same, expected 'class com.mycompany.SuccessPage', current 'class com.mycompany.HomePage'

    at org.apache.wicket.util.tester.WicketTester.assertResult(WicketTester.java:798)
    at org.apache.wicket.util.tester.WicketTester.assertRenderedPage(WicketTester.java:697)
    at com.mycompany.TestHomePage.validLogin(TestHomePage.java:48)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
    at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
    at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:230)
    at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:58)

I got the answer, so I didn't reference the form.submit(); to the onSubmit() function so I basically did this:

@Test
    public void validLogin() throws Exception {
        tester.startPage(HomePage.class);

    //  tester.startComponentInPage(HomePage.class);
        FormTester form = tester.newFormTester("userForm");
        form.setValue("username", "emile");
        form.setValue("password", "123");
        form.submit("error"); // new code that was edited
        //onsubmit the Successpage is rendered in response
        tester.assertRenderedPage(SuccessPage.class);


    }

the form.submit("error"); now references to the wicket:id="error" and passed the test :D