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copied!<p>It's probably work reading the Wikipedia article on <a href="http://en.wikipedia.org/wiki/Unit_testing" rel="nofollow noreferrer">Unit Testing</a>, as this will answer most of your questions regarding <strong>why</strong>. The <a href="http://junit.org" rel="nofollow noreferrer">JUnit</a> web site has resources for writing a Java unit test, of which the <a href="http://junit.sourceforge.net/doc/cookbook/cookbook.htm" rel="nofollow noreferrer">Junit Cookbook</a> should probably be your first stop.</p> <p>Personally, I write unit tests to test the contract of a method, i.e. the documentation for a particular function. This way you will enter into a cycle of increasing your test coverage and improving documentation. However, you should try to avoid testing:</p> <ul> <li>Other people's code, including the JDK</li> <li>Non-deterministic code, such as java.util.Random</li> </ul> <p>JUnit is not the only unit testing framework available for Java, so you should evaluate other frameworks like <a href="http://testng.org/doc/index.html" rel="nofollow noreferrer">TestNG</a> before diving into it.</p> <p>In addition to "top-level" frameworks, you will also find quite a few projects covering specific areas, such as:</p> <ul> <li><a href="http://htmlunit.sourceforge.net/" rel="nofollow noreferrer">HTMLUnit</a> for Web</li> <li><a href="http://www.cafesip.org/projects/sipunit/" rel="nofollow noreferrer">SIPUnit</a> for SIP</li> <li><a href="https://swingunit.dev.java.net/" rel="nofollow noreferrer">SwingUnit</a> for GUI Code</li> </ul>

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