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    <p>In my (limited) experience the first option is quite a bit safer. In a test-case you only test predefined input and compare the outcome, this works well as long as every possible edge-case has been checked. The first option just checks every input and thus tests the 'live' values, it filters out bugs real quickly, however it comes with a performance penalty.</p> <p>In <a href="http://rads.stackoverflow.com/amzn/click/0735619670" rel="nofollow noreferrer">Code Complete</a> Steve McConnell learns us the first method can be used successfully to filter out bugs in a <strong>debug</strong> build. In release build you can filter-out all assertions (for instance with a compiler flag) to get the extra performance.</p> <p>In my opinion the best way is to use both methods:</p> <p>Method 1 to catch illegal values</p> <pre><code>int doWonderfulThings(const int* fantasticData) { ASSERT(fantasticData); ASSERTNOTEQUAL(0, fantasticData) return WOW_VALUE / fantasticData; } </code></pre> <p>and method 2 to test edge-cases of an algorithm.</p> <pre><code>int doMoreWonderfulThings(const int fantasticNumber) { int count = 100; for(int i = 0; i &lt; fantasticNumber; ++i) { count += 10 * fantasticNumber; } return count; } TEST(TDD_Enjoy) { // Test lower edge ASSERT_EQ(0, doMoreWonderfulThings(-1)); ASSERT_EQ(0, doMoreWonderfulThings(0)); ASSERT_EQ(110, doMoreWonderfulThings(1)); //Test some random values ASSERT_EQ(350, doMoreWonderfulThings(5)); ASSERT_EQ(2350, doMoreWonderfulThings(15)); ASSERT_EQ(225100, doMoreWonderfulThings(150)); } </code></pre>
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