This document discusses unit testing in Groovy. It begins with reviewing basics of unit test structure and organization, including parts of a test like annotations and assertions, and different styles of organizing tests by class, feature, or fixture. The document then provides an example of a Groovy unit test for a game board, showing how to test for exceptions from invalid moves and assert that valid moves are properly marked on the board. It concludes with references for further reading on testing patterns and practices.

1. Groovy Unit Testing By Franz See [email_address] http://twitter.com/franz_see

2. Agenda I. Review Basics A. Parts B. Organization II. Groovy Test

3. Review Basics :: Parts @RunWith(Suite.class) @Suite.SuiteClasses([..]) class GameBoardTests { static class Move_Validation extends GivenGameBoard { @Test( expected = IllegalMoveException.class ) void givenXIsBelow1() { } @Test( expected = IllegalMoveException.class ) void givenXIsAbove3() { } ... } static class Move_Marking extends GivenGameBoard { @Test void givenValidMove_shouldMarkLocation() { } @Test void givenValidMoves_shouldMarkLocations() { } } ... }

4. Review Basics :: Parts @Test void givenValidMove_shouldMarkLocation() { int x = 1, y = 3 gameBoard.move(x, y) assertEquals "Should have been marked 'X' after the move.", X, gameBoard.getCells()[y-1][x-1] }

5. Review Basics :: Parts @Test void givenValidMove_shouldMarkLocation() { int x = 1, y = 3 assertThat "[GUARD] Makes sure that it is not 'X' ' + 'before the move.", gameBoard.getCells()[y-1][x-1], not(equalTo(X)) gameBoard.move(x, y) assertEquals "Should have been marked 'X' after the move.", X, gameBoard.getCells()[y-1][x-1] }

6. Review Basics :: Organization A. Test by Class B. Test by Feature C. Test by Fixture

7. Review Basics :: Organization :: by Class @RunWith(Suite.class) class GameBoardTests { @Test( expected = IllegalMoveException.class ) void givenXIsBelow1_whenMove_then _thenComplain () {…} @Test( expected = IllegalMoveException.class ) void givenXIsAbove3_whenMove_thenComplain() {…} @Test void givenValidMove_whenMove_shouldMarkLocation() {…} @Test void givenValidMoves_ whennMove_ shouldMarkLocations() {…} }

8. Review Basics :: Organization :: by Feature @RunWith(Suite.class) @Suite.SuiteClasses([..]) class GameBoardTests { static class Move { @Test( expected = IllegalMoveException.class ) void givenXIsBelow1_then_thenComplain() {…} @Test( expected = IllegalMoveException.class ) void givenXIsAbove3_thenComplain() {…} @Test void givenValidMove_shouldMarkLocation() {…} @Test void givenValidMoves_shouldMarkLocations() {…} } }

9. Review Basics :: Organization :: by Fixture @RunWith(Suite.class) @Suite.SuiteClasses([..]) class GameBoardTests { static class GivenXIsBelow1 { @Test( expected = IllegalMoveException.class ) void thenComplain() {…} } static class GivenXIsAbove3 { @Test( expected = IllegalMoveException.class ) void thenComplain() {…} } static class GivenValidMove { @Test void shouldMarkLocation() {…} @Test void shouldMarkLocations() {…} } }

10. Groovy Test (see code)

11. Thank you. Questions?

13. Working Effectively with Legacy Code

14. http://www.mockobjects.com/

15. http://tech.groups.yahoo.com/group/testdrivendevelopment/

16. http://sites.google.com/site/tddproblems/

17. http://code.google.com/p/tic-tac-toe-tdd/

18. http://code.google.com/p/appfuse-top-to-bottom-tdd/