test: add from tests for degenerate cases

diff --git a/test/from/is_from.c b/test/from/is_from.c
index 952059754510e951c24315fb94e3af1f302a60f5..c5bf0d61b566a18f7747ebacc363774a304db9ce 100644 (file)
--- a/test/from/is_from.c
+++ b/test/from/is_from.c
@@ -30,4 +30,20 @@
 void test_is_from(void)
 {
   // bool is_from(const char *s, char *path, size_t pathlen, time_t *tp);
+
+  {
+    char buf[32] = { 0 };
+    time_t t = { 0 };
+    TEST_CHECK(!is_from(NULL, buf, sizeof(buf), &t));
+  }
+
+  {
+    time_t t = { 0 };
+    TEST_CHECK(!is_from("apple", NULL, 10, &t));
+  }
+
+  {
+    char buf[32] = { 0 };
+    TEST_CHECK(!is_from("apple", buf, sizeof(buf), NULL));
+  }
 }