Simplify test framework and improve test script

tests/testing.c

@@ -2,20 +2,9 @@
 
 #include <stdio.h>
 
-test_run_t test_run;
+int fail_count;
 
 void testing_fail_msg(const char *func, const char *file, int line)
 {
 	printf("%s: failed assert @ %s:%d\n", func, file, line);
 }
-
-void testing_end_msg(void)
-{
-	const double success_rate
-	    = 1 - (double)test_run.fail_count / (double)test_run.test_count;
-	printf(
-	    "%d tests ran (%d assertions), "
-	    "%0.2f%% successful (%d failures)\n",
-	    test_run.test_count, test_run.assertion_count, 100 * success_rate,
-	    test_run.fail_count);
-}