How to Unit test ViewModel Annotation methods ?

answered 2020-04-30 22:26:26 +0800

cor3000
6280 ● 2 ● 7

In the ideal case you implemented your ViewModel isolated from the UI as is the idea of MVVM. You should then be able to instantiate your ViewModel directly in your test case and then call the public methods directly.

Here a simple ViewModel:

public class MyViewModel {
    private String name;

    @Command 
    public void clearName() {
        this.name = null;
    }

    public void getName() {
        return this.name;
    }
    /*setter*/
}

In your test you can then...

@Test
public void testClearName() {
    MyViewModel vm = new MyViewModel();
    vm.setName("initially filled");

    //call @Command method directly
    vm.clearName();
    Assert.assertNull("viewModel name should be empty", vm.getName());
}

As said this is the ideal case ... in an ideal MVVM scenario, as soon as you start mixing MVVM with MVC concepts these benefits go away and you'll have to start mocking out everything that's not provided during the runtime of your test case.

Or you could use ZATS which will emulate the client server environment by running an embedded jetty container starting your web application.

Here the related documentation including example code: https://www.zkoss.org/documentation/zats