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

test/test_addition.c

@@ -4,6 +4,8 @@
 
 #include "addition.h"
 
+int* nullcarry = NULL;
+
 void setUp(void)
 {
 }
@@ -12,9 +14,14 @@ void tearDown(void)
 {
 }
 
-void test_addition_NeedToImplement(void)
+void test_addition_volladdierer_nullplusnullgleichnull(void)
 {
-    TEST_IGNORE_MESSAGE("Need to Implement addition");
+    int result[1];
+    int expected = 0;
+
+    volladdierer(result, nullcarry, 0, 0, 0);
+
+    TEST_ASSERT_EQUAL_INT(expected, result[0]);
 }
 
 #endif // TEST