[jira] [Created] (WICKET-6713) BaseWicketTester does not reset componentInPage field

["Andreas Müller (Jira)" <ji...@apache.org>]

Andreas Müller created WICKET-6713:
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             Summary: BaseWicketTester does not reset componentInPage field
                 Key: WICKET-6713
                 URL: https://issues.apache.org/jira/browse/WICKET-6713
             Project: Wicket
          Issue Type: Bug
          Components: wicket-core
    Affects Versions: 8.5.0
            Reporter: Andreas Müller


There seems to be a bug in the BaseWicketTester, if you use the method {{startComponentInPage()}} with its class signature ({{Class<C>}}) instead of its instance signature ({{C component}}).

It will set the {{componentInPage}} field with the wicketId „testObject“.

If you then start another component in Page (passing a component instance) in the same WicketTester instance, all wicketPaths from {{getComponentFromLastRenderedPage()}} of that second component will be prefixed with „testObject:“, because  method will use the id of the {{componentInPage}} field. 

This results in false path assertions on the later component. 
For example this test won’t succeed:
 
{code}@Test
public void testRender() {
  WicketTester tester = new WicketTester();
 
  tester.startComponentInPage(DummyPanel.class);
 
  tester.startComponentInPage(new DummyPanel(„panel“));
  tester.assertComponent("panel", DummyPanel.class);
}{code}
 
The AssertionError is stated as follows:
{noformat}java.lang.AssertionError: path: 'testObject:panel' does not exist for page: StartComponentInPage{noformat}
 
 
Without the line „tester.startComponentInPage(DummyPanel.class);“ it will run smoothly.

Usually one is not starting multiple components in one test. 
But this issue can also have effects on other tests, if they are using the same WicketTester instance.
 
Maybe {{startComponentInPage(final C component, IMarkupFragment pageMarkup)}} should reset {{componentInPage}}, if it is not called by {{startComponentInPage(final Class<C> componentClass, final IMarkupFragment pageMarkup)}}.



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