simple.t.c

This is an simple example of how to write a test using the library. The output of this program is:

   1..1
   # Testing basic functions
   ok 1 - Testing gcs()

The basic structure is: plan the number of test points using the plan() function, perform the test and write out the result of each test point using the ok() function, print out a diagnostics message using diag(), and report the result of the test by calling the exit_status() function. Observe that this test does excessive testing (see Writing unnecessarily large tests), but the test point doesn't take very long time.

#include <tap.h>

unsigned int gcs(unsigned int a, unsigned int b)
{
  if (b > a) {
    unsigned int t = a;
    a = b;
    b = t;
  }

  while (b != 0) {
    unsigned int m = a % b;
    a = b;
    b = m;
  }
  return a;
}

int main() {
  unsigned int a,b;
  unsigned int failed;
  plan(1);
  diag("Testing basic functions");
  failed = 0;
  for (a = 1 ; a < 2000 ; ++a)
    for (b = 1 ; b < 2000 ; ++b)
    {
      unsigned int d = gcs(a, b);
      if (a % d != 0 || b % d != 0) {
        ++failed;
        diag("Failed for gcs(%4u,%4u)", a, b);
      }
    }
  ok(failed == 0, "Testing gcs()");
  return exit_status();
}

---