add unit test

5 years ago · 2c4e279f1e
parent e0ab8984bf
commit 2c4e279f1e
1 changed files with 12 additions and 0 deletions
--- a/str/str_diff.c
+++ b/str/str_diff.c
@ -21,3 +21,15 @@ int str_diff(const char* a, const char* b) {
  }
  return j;
 }
+
+#ifdef UNITTEST
+#include <assert.h>
+#include <string.h>
+
+int main() {
+  assert(str_diff("foo","foo")==0);
+  assert(str_diff("foo","fob")==('o'-'b'));
+  assert(str_diff("foo","foox")==(-'x'));
+  assert(str_diff("foox","foo")=='x');
+}
+#endif