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POFor testing purposes, how to add an additional element to an enum at runtime?
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  1. POFor testing purposes, how to add an additional element to an enum at runtime?
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    copied!<p><strong>tl;dr:</strong> How do I, at runtime -for the purpose of testing-, add another element to a enum? I'm sure there must be away using some byte manipulation library like how PowerMockito works etc. I do <strong>not</strong> consider this a duplicate of <a href="https://stackoverflow.com/questions/478403/can-i-add-and-remove-elements-of-enumeration-at-runtime-in-java">"Can I add and remove elements of enumeration at runtime in Java"</a> because I'm willing to put up with the kind of byte-manipulation or class-loader hacks you wouldn't do in production code, because it's for a test.</p> <hr> <p>I'm writing Java unit tests and running unit test coverage reports. The only lines I'm not able to reach are in the code where I have a <code>default</code> case on a <code>switch</code> statement with an <code>enum</code> where all the enums are covered by the cases.</p> <blockquote> <p>enum Pet { CAT, DOG; }</p> </blockquote> <p>and then code like</p> <pre><code>final String speak; switch( myPet ){ case CAT: speak = "meow"; break; case DOG: speak = "ruff"; break; default: throw new IllegalArgumentException( "should not get here" ); } System.out.println( speak ); </code></pre> <p>I <strong>need</strong> to have the <code>default</code> statement or <code>javac</code> will complain that final line is using <code>speak</code> which might not be initialized.</p> <p>However, I cannot get that line covered because there are no other values, and I don't want to add an additional enum value to <em>production</em> code for the purposes of <em>testing</em>. </p>
 

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