Adds remove first and last element test in size 1 list

Signed-off-by: CapXilinx <melik-merkumians@acin.tuwien.ac.at>

source/tests/utils/doublylinkedlistTests.cpp

@@ -234,26 +234,28 @@ TEST(DoublyLinkedList, RemoveFirstElementInList) {
   DoublyLinkedListDestroy(&list);
 }
 
-TEST(DoublyLinkedList, RemoveMiddleElement) {
+TEST(DoublyLinkedList, RemoveFirstElementInOtherwiseEmptyList) {
   int test_data_1 = 2;
-  int test_data_2 = 4;
-  int test_data_3 = 8;
   DoublyLinkedList list;
   DoublyLinkedListInitialize(&list, CallocAllocator, CallocDeallocator);
   DoublyLinkedListInsertAtTail(&list, &test_data_1);
-  DoublyLinkedListInsertAtTail(&list, &test_data_2);
-  DoublyLinkedListInsertAtTail(&list, &test_data_3);
-  DoublyLinkedListNode *node_to_be_deleted = list.first->next;
+  DoublyLinkedListNode *node_to_be_deleted = list.first;
   DoublyLinkedListRemoveNode(&list, &node_to_be_deleted);
-  CHECK_EQUAL(4, test_data_2);
-  CHECK_EQUAL(8, *( (int *)list.first->next->data ) );
+  CHECK_EQUAL(2, test_data_1);
+  POINTERS_EQUAL(NULL, list.first);
+  POINTERS_EQUAL(NULL, list.last);
   DoublyLinkedListDestroy(&list);
 }
 
-TEST(DoublyLinkedList, RemoveFirstElementInOtherwiseEmptyList) {
-  FAIL("Not implemented!");
-}
-
 TEST(DoublyLinkedList, RemoveLastElementInOtherwiseEmptyList) {
-  FAIL("Not implemented!");
+  int test_data_1 = 2;
+  DoublyLinkedList list;
+  DoublyLinkedListInitialize(&list, CallocAllocator, CallocDeallocator);
+  DoublyLinkedListInsertAtTail(&list, &test_data_1);
+  DoublyLinkedListNode *node_to_be_deleted = list.last;
+  DoublyLinkedListRemoveNode(&list, &node_to_be_deleted);
+  CHECK_EQUAL(2, test_data_1);
+  POINTERS_EQUAL(NULL, list.first);
+  POINTERS_EQUAL(NULL, list.last);
+  DoublyLinkedListDestroy(&list);
 }