Why to use Groovy for unit testing instead of Java and how it increases productivity - its syntax being ~ 100% Java + ~ 1000% more, optional usage of static/dynamic typing, closures, hundreds of utility methods added to the standard JDK classes... . See http://theholyjava.wordpress.com/2011/10/18/only-a-masochist-would-write-unit-tests-in-java-be-smarter-use-groovy-or-jruby-or-st-else-similar/ for more

1. for testing

2. What is Groovy?

3. Java is Groovy... public class MethodFakingFunctionMapperTest { private MethodFakingFunctionMapper mapper ; @Before public void setUp() throws Exception { mapper = new MethodFakingFunctionMapper(); } @Test public void should_return_fakeMethod0_for_no_args_call() { mapper .setCurrentExpression( "#{ns:myFun0()}" ); Method actualMethod = mapper .resolveFunction( "ns" , "myFun0" ); assertSame ( FAKE_METHODS [0], actualMethod); }

4. (Yes, Groovy is a programming language for the JVM, based on Java)

5. ... but Groovy >> Java // Bean creation: def testBean = n ew Customer( surName: "Newt" , age: 42 ) // Shortcut methods on File etc.: assert test. method () == new File( "expected.txt" ). getText () // Closure-based filter/find/transform on collections: assert customerFinder. findAll (). collect {it.surName}. sort () == [ "Lizard" , "Newt" ] // Literals for maps and lists, comparison for equality via == : assert getCapitalsMap() == [ "UK" : "London" , "CR" : "Prague" ] // Literals for RegExps and utility methods on Matcher : assert ( "dog1-dog2" =~ /dog/). getAt ([ 0 , 1 ]) == [ "dog1" , "dog2" ]

9. Productivity

10. Productivity

11. Productivity

12. Productivity

13. Productivity

14. Productivity

15. Productivity

16. We can even use Spock! @ S peck class DataDriven { def &quot;maximum of two numbers&quot; () { expect: Math.max(a, b) == c where: a << [ 7 , 4 , 9 ] b << [ 3 , 5 , 9 ] c << [ 7 , 5 , 9 ] } }

17. Q & A