WEBVTT

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The Room class has now been refactored

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to use an ArrayList to store its items

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rather than an array.

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In this demo I'm going to test the refactored Room class

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refactoring improves the way a class is implemented

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but doesn't add any new capabilities to the class.

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In the previous increment I created a JUnit test class

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and test method to test the functionality of the room class

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since that functionality shouldn't have changed at all

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I should be able to rerun exactly the same test

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and it should still pass that test.

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So let's do that

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I could use the run test button as before

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to run all the tests in the project

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or since I'm just testing the room class here

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I can use the right click menu option in RoomTest

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to test all, that will run all the

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test methods in the RoomTest class.

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So I do that

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the test window opens, I have a green bar

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and that shows that the refactored version 

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of the Room class still passes the same test

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as the original version did.

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So I can be confident that in refactoring the room class

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I haven't removed or broken any of the functionality

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it had originally.

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As I mentioned before

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I've only written one example test method in my test class

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to test a class thoroughly

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you should write test methods for 

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all the significant functionality in that class.

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Automated unit testing makes it very quick and easy

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to fully test the functionality of a class

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where all the classes in your project

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each time you refactor.