diff --git a/c-check/test_main.c b/c-check/test_main.c
index 0d5a0de0..3fb1a1db 100644
--- a/c-check/test_main.c
+++ b/c-check/test_main.c
@@ -2,7 +2,7 @@
 #include <stdlib.h>
 #include <check.h>
 
-Suite *suite_rose(void);
+Suite *suite_normal(void);
 
 int main(int argc, char **argv)
 {
@@ -15,7 +15,7 @@ int main(int argc, char **argv)
     forkme = 0;
   }
 
-  s = suite_rose();
+  s = suite_normal();
   runner = srunner_create(s);
 
   if (0 == forkme) {
diff --git a/c-check/test_rose.c b/c-check/test_rose.c
index 9d340104..98fbab5b 100644
--- a/c-check/test_rose.c
+++ b/c-check/test_rose.c
@@ -24,6 +24,16 @@ START_TEST(normalitem_whenSellIsZero_decreasesQualityByTwo)
 }
 END_TEST
 
+START_TEST(normalitem_whenQualityZero_doesNotDecrease)
+{
+  Item items[1];
+  init_item(items, NORMAL_ITEM, 10, 0);
+  update_quality(items, 1);
+
+  ck_assert_int_eq(0, items[0].quality);
+}
+END_TEST
+
 TCase *tcase_rose(void)
 {
   TCase *tc;
@@ -31,11 +41,12 @@ TCase *tcase_rose(void)
   tc = tcase_create("normal-items");
   tcase_add_test(tc, normalitem_whenSellInPositive_decreasesQualityByOne);
   tcase_add_test(tc, normalitem_whenSellIsZero_decreasesQualityByTwo);
+  tcase_add_test(tc, normalitem_whenQualityZero_doesNotDecrease);
 
   return tc;
 }
 
-Suite *suite_rose(void)
+Suite *suite_normal(void)
 {
   Suite *s;