When we mock or stub methods we can use the method arguments passed to the method in the response for the mocked or stubbed method. We must write a closure after the rightShift operator (>>) and the closure arguments will resemble the arguments of the mocked or stubbed method. Alternatively we can use a single non-typed argument in the closure and this will contains the method argument list.

Let's create a specification where we use this feature. In the following sample we use a mock for the AgeService used in the class under test. The method allowedMaxTime() is invoked by the class under test and basically should return the maximum hour of the day a show can be broadcasted. In our specification we use the name of the show to return different values during the test.

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Spock has some great features to write specifications or tests that are short and compact. One of them is the old() method. The old() method can only be used in a then: block. With this method we get the value a statement had before the when: block is executed.

Let's see this with a simple example. In the following specification we create a StringBuilder with an initial value. In the then: block we use the same initial value for the assertion:

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