If we want to test the selection of a radio choice we must take some extra steps. After reading this JIRA issue we have a solution:
package com.mrhaki.wicket; import org.apache.wicket.Component; import org.apache.wicket.Component.IVisitor; import org.apache.wicket.markup.html.form.RadioChoice; import org.apache.wicket.util.tester.FormTester; import org.apache.wicket.util.tester.WicketTester; import org.junit.Test; public class PageTest { @Test public void testRadioChoice() { final WicketTester tester = new WicketTester(); tester.startPage(Page.class); final FormTester form = tester.newFormTester("form"); form.select("radiochoice", 0); form.getForm().visitChildren(RadioChoice.class, new IVisitor() { public Object component(final Component component) { if (component.getId().equals("radiochoice")) { ((RadioChoice) component).onSelectionChanged(); } return CONTINUE_TRAVERSAL; } }); // Do assertion checks here // ... } }