diff --git a/src/test/test-alloc-util.c b/src/test/test-alloc-util.c
index 7e779ac561..ed598e106c 100644
--- a/src/test/test-alloc-util.c
+++ b/src/test/test-alloc-util.c
@@ -18,6 +18,8 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
+#include <stdint.h>
+
 #include "alloc-util.h"
 #include "macro.h"
 #include "util.h"
@@ -35,22 +37,42 @@ static void test_alloca(void) {
         assert_se(!memcmp(t, zero, 997));
 }
 
-static void test_memdup_multiply(void) {
+static void test_memdup_multiply_and_greedy_realloc(void) {
         int org[] = {1, 2, 3};
-        int *dup;
-
-        dup = (int*)memdup_multiply(org, sizeof(int), 3);
+        _cleanup_free_ int *dup;
+        int *p;
+        size_t i, allocated = 3;
 
+        dup = (int*) memdup_suffix0_multiply(org, sizeof(int), 3);
         assert_se(dup);
         assert_se(dup[0] == 1);
         assert_se(dup[1] == 2);
         assert_se(dup[2] == 3);
+        assert_se(*(uint8_t*) (dup + 3) == (uint8_t) 0);
         free(dup);
+
+        dup = (int*) memdup_multiply(org, sizeof(int), 3);
+        assert_se(dup);
+        assert_se(dup[0] == 1);
+        assert_se(dup[1] == 2);
+        assert_se(dup[2] == 3);
+
+        p = dup;
+        assert_se(greedy_realloc0((void**) &dup, &allocated, 2, sizeof(int)) == p);
+
+        p = (int *) greedy_realloc0((void**) &dup, &allocated, 10, sizeof(int));
+        assert_se(p == dup);
+        assert_se(allocated >= 10);
+        assert_se(p[0] == 1);
+        assert_se(p[1] == 2);
+        assert_se(p[2] == 3);
+        for (i = 3; i < allocated; i++)
+                assert_se(p[i] == 0);
 }
 
 int main(int argc, char *argv[]) {
         test_alloca();
-        test_memdup_multiply();
+        test_memdup_multiply_and_greedy_realloc();
 
         return 0;
 }