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In this section, we're going to be hands on and walk

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through the creation of some production code and

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use the JUnit API to test it.

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As we do this, we're going to explain

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JUnit features in a just in time way.

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So in other words, explain the features as we go

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along and need to use them in this way

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they're explaining context.

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Now, the code we're going to look at

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is simple and this is by design.

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We're not looking to write tons of

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complex unit tests which test hugely complex

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pieces of functionality in this section.

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Now we just want to take easy to walk

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steps where we can understand what's happening

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with JUnit as we go along and focus

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on JUnit itself, instead of devoting our brain cells

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to understanding some tricky, complex contrived code.

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By learning about JUnit in this way, by taking

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those easy to walk steps, you'll get good mastery

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of the core concepts which you can then apply

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to those complex pieces of code you want into

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testing your projects at a later date.

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But we have to understand the basics first.

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So let's jump in now and start

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writing some unit tests with JUnit.