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POBasic unit test and C, how do I get started?
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copied!<p>After reading quite some threads here at StackOverflow, I have come to the conclusion that I should adopt to some form of test driven development/unit test (or at least explore the area).</p> <p>And since we are talking about c code under Linux, I decided to give <a href="http://check.sourceforge.net/doc/check.html/index.html" rel="nofollow noreferrer">check</a> a try (I don't know if this is the right choice but if it's no good I can always try something else later on).</p> <p>But since this concept of unit test and unit test frameworks is totally new to me, I started out to do some unit test on a really small test code (but I was totally lost anyway and it felt like I was missing something).</p> <p>This is what I have done so far, I created the following file:</p> <ul> <li>main.c, a main that only calls a function called my_pow and prints the result.</li> <li>my_pow.c, contains the function my_pow.</li> <li>my_pow.h </li> <li>my_pow_test.c, I figured that I should place the unit code for the my_pow function here.</li> </ul> <p>(So the "normal program" is the main.c, my_pow.c and my_pow.h.)</p> <p>This is my_pow.c</p> <pre> <code> #include "my_pow.h" int my_pow(int a, int b) { return (a*b); } </code> </pre> <p>Then I figured that in my_pow_test.c I put something like this:</p> <pre> <code> #include <check.h> #include "my_pow.h" START_TEST (test_my_pow) { /* unit test code */ } END_TEST //do I need some sort off main here that calls test_my_pow? </code> </pre> <p>This is basically the same as in <a href="http://check.sourceforge.net/doc/check.html/index.html" rel="nofollow noreferrer">the check manual</a> chapter 3.1, but still not....</p> <p>Could someone please push me in the right direction?</p> <p>Thanks Johan</p> <hr> <p>Update: No reason why I tried to use check I just thought I should start somewhere, maybe CUnit is a better choice (I think I would try that as well and then make a educated choice).</p> <p>Update: Thanks @philippe for indirectly pointing out that the on-line documentation is only half of the truth, the example code that clarifies what the documentation talks about was already installed with the check package. In the Ubuntu case /usr/share/doc/check/example/tests/</p> <p>Update: The code example was created so that you started out by looking at his first version, then the second one etc etc. So that you could follow how he creates a very basic test case/code from nothing up to something that is useful in a traditional TTD way. </p> <p>And since my code was broken and I wanted the unit test to prove this, I cheated a little and tested against the real pow function. Something like this: </p> <pre> <code> START_TEST (test_my_pow1) { int resultat = my_pow(3,3); int math = pow(3,3); fail_unless ( resultat == math, "Error on 3^3 != %d (%d)",math, resultat); } </code> </pre> <p>However in the future I will not reproduce what is already in the stdlibs :-)</p> <hr> <p>Related:</p> <ul> <li><a href="https://stackoverflow.com/questions/65820/unit-testing-c-code">Unit Testing C Code</a></li> <li><a href="https://stackoverflow.com/questions/148576/how-to-test-c-code">How to test C Code</a></li> <li><a href="https://stackoverflow.com/questions/177251/unit-testing-frameworks-for-c">Unit Testing Frameworks for C</a></li> <li><a href="https://stackoverflow.com/questions/437233/testing-frameworks-for-c">Testing Frameworks for C</a></li> <li><a href="https://stackoverflow.com/questions/453141/basic-unit-test-and-c-how-do-i-get-started">Basic unit test and C, how do I get started?</a></li> </ul> <p>taken from searching <code>[c] [unit-testing]</code>.</p>

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