Add test_assert

snippet/cpp/test_assert.c

@@ -0,0 +1,9 @@
+#include <stdio.h>
+#include <assert.h>
+
+int main(int argc, char *argv[]) {
+    assert(1 > 0);
+    /* stop running */
+    assert(1 < 0);
+    return 0;
+}