Hello. I am trying to test a custom Wicket page and I am stuck when trying to
submit a form. I have isolated a minimal working example.
The problem seems to be the wantOnSelectionChangedNotifications method of
the DropDownChoice. If it's set to true, the test prints out "Model = null",
otherwise it prints the correct solution "Model = choice2". Reading the
documentation I understand that when the DropDown's selection is changed, a
roundtrip is sent to update the DropDown's model, but where does the null
come from?
Below you can find the code. Thank you in advance.
*DropDownPage.java*
package pages;
import java.util.ArrayList;
import org.apache.wicket.markup.html.WebPage;
import org.apache.wicket.markup.html.form.Button;
import org.apache.wicket.markup.html.form.DropDownChoice;
import org.apache.wicket.markup.html.form.Form;
import org.apache.wicket.model.IModel;
import org.apache.wicket.model.Model;
import org.apache.wicket.request.mapper.parameter.PageParameters;
public class DropDownPage extends WebPage {
private Model<String> model;
public DropDownPage() {
Form form = new Form("form") {
protected void onSubmit() {
System.out.println("Model = " +
model.getObject());
}
};
add(form);
ArrayList<String> choices = new ArrayList<String>();
choices.add("choice1");
choices.add("choice2");
model = new Model<String>("choice1");
DropDownChoice<String> dropDown = new
DropDownChoice<String>("dropDown",
model, choices) {
@Override
protected void onSelectionChanged(String newSelection) {
}
@Override
protected boolean wantOnSelectionChangedNotifications()
{
return true;
}
};
form.add(dropDown);
form.add(new Button("button", new Model<String>("Submit")));
}
}
*DropDownPage.html*
<html>
<body>
<form wicket:id='form'>
<select wicket:id='dropDown'>
<option></option>
</select>
<input type='submit' wicket:id='button'></input>
</form>
</body>
</html>
*DropDownPageTest.java*
package pages;
import static org.junit.Assert.*;
import org.apache.wicket.util.tester.FormTester;
import org.apache.wicket.util.tester.WicketTester;
import org.junit.Before;
import org.junit.Test;
public class DropDownPageTest {
private WicketTester tester;
@Before
public void setUp() throws Exception {
tester = new WicketTester();
}
@Test
public void test() {
tester.startPage(DropDownPage.class);
tester.assertRenderedPage(DropDownPage.class);
FormTester formTester = tester.newFormTester("form");
formTester.select("dropDown", 1);
formTester.submit();
}
}
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