Weblog for the AMIS Technology corner
Posts tagged junit
ASCII art as a DSL for unit testing
Feb 16th
Complicated tree structures are being used a lot within my current project. Tree nodes have elements behind them. An element is unique, but there can be multiple tree nodes for a single element. Tree nodes have different drag and drop behavior based on flags on both the tree nodes and the elements. Also tree nodes can inherit children from other tree nodes etc. This blog will be about how to unit test these trees or more exactly how to setup a unit test so that it is fun to create and easy to maintain.
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Improve your unit-tests with jMock2
Sep 4th
Writing unit-tests
should be part of your development process whether you write them
before or after the actual coding I leave that up to you. On of the
pitfalls of writing unit tests is that the units become to big.
The unit your are
testing, a method in most cases probably uses some other beans or
services to do its job. In your unit test you don’t want to test
those other beans but just your method. Because you use decoupling 
you can easily override the interfaces of the services in your test
case and inject those services in your instance you are testing. This
is an example of a mock object.
This is maybe good for one or two mock objects but it gets tricky. Who test the mock objects? You will soon get a lot of logic in the mock objects. To reuse them they need to be extracted from the unit test. You don’t have checks if the mock objects are really called. There are several
frameworks that will do this mocking for you. You supply them the
interface and they will give you an implementation which can be
injected into the bean thats being tested.
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