testing: addition full adder base case 0+0=0 with carryover

test/test_addition.c

@@ -24,4 +24,14 @@ void test_addition_volladdierer_nullplusnullgleichnull(void)
     TEST_ASSERT_EQUAL_INT(expected, result[0]);
 }
 
+void test_addition_volladdierer_nullplusnullgleichnullmituebertrag(void)
+{
+    int result[1];
+    int expected = 1;
+
+    volladdierer(result, nullcarry, 0, 0, 1);
+
+    TEST_ASSERT_EQUAL_INT(expected, result[0]);
+}
+
 #endif // TEST