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<p><a href="http://codeforfun.wordpress.com/2007/04/09/gspec-for-java-bdd/">GSpec</a> is an evolving framework to allow you to apply a <a href="http://en.wikipedia.org/wiki/Behavior_driven_development">BDD</a> style of programming when using Groovy. The sections below illustrate using GSpec for the examples from <a class="confluence-link" href="/display/GROOVY/Using+Testing+Frameworks+with+Groovy" data-linked-resource-id="67695" data-linked-resource-type="page" data-linked-resource-default-alias="Using Testing Frameworks with Groovy" data-base-url="http://docs.codehaus.org">Using Testing Frameworks with Groovy</a>.</p>

<h2>The Stack Example</h2>

<p>Here is how you might test the <a class="confluence-link" href="/display/GROOVY/Using+Testing+Frameworks+with+Groovy#UsingTestingFrameworkswithGroovy-AStackExample" data-anchor="AStackExample" data-linked-resource-id="67695" data-linked-resource-type="page" data-linked-resource-default-alias="Using Testing Frameworks with Groovy#AStackExample" data-base-url="http://docs.codehaus.org">Stack Example</a> with GSpec:</p>

<table class="wysiwyg-macro" data-macro-name="code" style="background-image: url(/plugins/servlet/confluence/placeholder/macro-heading?definition=e2NvZGV9&amp;locale=en_GB&amp;version=2); background-repeat: no-repeat;" data-macro-body-type="PLAIN_TEXT"><tr><td class="wysiwyg-macro-body"><pre>
import com.craig.gspec.GSpecBuilderRunner

def the = new GSpecBuilderRunner()

the.context('A non-empty stack') {
    initially {
        the.stack = new FixedStack()
        ('a'..'c').each { x -> the.stack.push x }
        the.stack.should_not_be_empty
    }

specify('should return the top item when sent #peek') {
        the.stack.peek().should_equal 'c'
    }

specify('should NOT remove the top item when sent #peek') {
        the.stack.peek().should_equal 'c'
        the.stack.peek().should_equal 'c'
    }

specify('should be unchanged when sent #push then #pop') {
        the.stack.push 'Anything'
        the.stack.pop()
        the.stack.peek().should_equal 'c'
    }

specify('should return the top item when sent #pop') {
        the.stack.pop().should_equal 'c'
        the.stack.push 'c' // put it back the way it was
    }

specify('should remove the top item when sent #pop') {
        the.stack.pop().should_equal 'c'
        the.stack.pop().should_equal 'b'
    }

specify('should add to the top when sent #push') {
        the.stack.push 'd'
        the.stack.peek().should_equal 'd'
    }
}

the.context('An empty stack') {
    initially {
        the.stack = new FixedStack()
        the.stack.should_be_empty
    }

specify('should no longer be empty after #push') {
        the.stack.push 'anything'
        the.stack.should_not_be_empty
    }

specify('should complain when sent #peek') {
//        the.stack.peek().should_fail_with StackUnderflowException
    }

specify('should complain when sent #pop') {
//        the.stack.pop().should_fail_with StackUnderflowException
    }
}

the.context('A stack with one item') {
    initially {
        the.stack = new FixedStack()
        the.stack.push 'anything'
        the.stack.should_not_be_empty
    }

specify('should remain not empty after #peek') {
        the.stack.peek()
        the.stack.should_not_be_empty
    }

specify('should become empty after #pop') {
        the.stack.pop()
        the.stack.should_be_empty
    }
}

the.context('A stack with one item less than capacity') {
    initially {
        the.stack = new FixedStack()
        (1..&lt;FixedStack.MAXSIZE).each { x -> the.stack.push x }
        the.stack.should_not_be_full
    }

specify('should become full after #push') {
        the.stack.push 'Anything'
        the.stack.should_be_full
    }
}

the.context('A full stack') {
    initially {
        the.stack = new FixedStack()
        (1..FixedStack.MAXSIZE).each { x -> the.stack.push x }
        the.stack.should_be_full
    }

specify('should remain full after #peek') {
        the.stack.peek()
        the.stack.should_be_full
    }

specify('should no longer be full after #pop') {
        the.stack.pop()
        the.stack.should_not_be_full
    }

specify('should complain on #push') {
//        the.stack.push('Anything').should_fail_with StackOverflowException
    }
}
</pre></td></tr></table>

<h2>The Item Storer Example</h2>

<p>Here is how you might integration test the <a class="confluence-link" href="/display/GROOVY/Using+Testing+Frameworks+with+Groovy#UsingTestingFrameworkswithGroovy-AnItemStorerExample" data-anchor="AnItemStorerExample" data-linked-resource-id="67695" data-linked-resource-type="page" data-linked-resource-default-alias="Using Testing Frameworks with Groovy#AnItemStorerExample" data-base-url="http://docs.codehaus.org">Item Storer Example</a> with GSpec:</p>

def checkPersistAndReverse(storer, orig, reversed){
    storer.put orig
    storer.get().should_equal orig
    storer.getReverse().should_equal reversed
}

def the = new GSpecBuilderRunner()

the.context('A new storer') {
    initially() {
        the.storer = new Storer()
    }
    specify('Should persist and reverse strings') {
        checkPersistAndReverse the.storer, 'hello', 'olleh'
    }
    specify('Should persist and reverse numbers') {
        checkPersistAndReverse the.storer, 123.456, -123.456
    }
    specify('Should persist and reverse lists') {
        checkPersistAndReverse the.storer, [1, 3, 5], [5, 3, 1]
    }
}
</pre></td></tr></table>