How to unit test a custom Wicket component

Question

Given this really simple Wicket component:

public class ProductImage extends WebComponent {

    public ProductImage(String id, Product p) {
        super(id, new Model(p));
        add(new AttributeModifier("src", true, new Model(p.getImage())));
    }
}

How to unit test it using WicketTester? Do I need a page?

score 6 · Answer 1 · answered Jul 11 '11 at 18:25

6

In Wicket 1.5 there is #startComponentInPage(Component) which will create a page for you so you can test any kind of component.

answered Jul 11 '11 at 18:25

martin-g

17,243
2
23
35

That's nice... Too bad I'm stuck with 1.4 for a while! But thanks, anyway! – Eduardo Costa Jul 11 '11 at 20:47

score 3 · Accepted Answer · answered Jul 11 '11 at 14:33

3

I haven't actually done that (I've only tested panels), but startComponent() seems to be the way to do it.

Something like this:

Product product = new Product(/* initialize product here */);
ProductImage pi = new ProductImage("image", product);
tester.startComponent(pi);
tester.assertContains(Pattern.quote(product.getImage()));

answered Jul 11 '11 at 14:33

Sean Patrick Floyd

292,901
67
465
588

hmmm, almost there! Really `startComponent` seems to be the way, but I cannot manage to test if "src" attribute is correct. – Eduardo Costa Jul 11 '11 at 15:54
@Eduardo not explicitly, but you can test like this: `tester.assertContains("src\\s*=\\s*\"" + Pattern.quote(product.getImage()) + "\"");` – Sean Patrick Floyd Jul 11 '11 at 15:58
that's what I thought, but your first example fails :( Digging into Wicket's source, I found assertContains works on tester.getServletResponse().getDocument(), and this is empty after startComponent! – Eduardo Costa Jul 11 '11 at 16:06
@Eduardo then I guess you'll need a panel after all. – Sean Patrick Floyd Jul 11 '11 at 16:08
:( Lot's of trouble for something as simple as that – Eduardo Costa Jul 11 '11 at 16:24
@Eduardo true, but there's still probably no other web framework where unit testing is that easy – Sean Patrick Floyd Jul 11 '11 at 20:56

How to unit test a custom Wicket component

2 Answers2

Linked