Why is the parent instance method called instead of the child (component)

I am trying to call the component methods, but it looks like its searching the parent instance for the method name:

I am using vue3.

I am getting the following error:
Property “test” was accessed during render but is not defined on instance.

http://jsfiddle.net/L3vj6dxr/15/
How can I call the component methods ?