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ModelJUnit is a Java library that extends JUnit to support model-based testing.

In this example, we will consider how to model and test a simple vending machine. The system under test is illustrated by the following state diagram:

The VendingMachineModel class models this system. Our script makes use of the RandomTester class to generate some tests for this model. The total code looks like this:

When we run this script, we will see the randomly generated test transitions. The output will be:

We can optionally obtain additional metrics about the test:

This generates the following:

We can also add a graph listener with the following code:

When run, a graphviz dot file is produced (corresponding to the image above) and the output is:

See also: State Pattern

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