adding unit tests for Curl_llist_remove

1 files changed, 83 insertions, 1 deletions

diff --git a/tests/unit/unit1300.c b/tests/unit/unit1300.c
index a835392b1..355b1afac 100644
--- a/tests/unit/unit1300.c
+++ b/tests/unit/unit1300.c
@@ -31,7 +31,11 @@ UNITTEST_START
   int unusedData_case1 = 1;
   int unusedData_case2 = 2;
   int unusedData_case3 = 3;
-
+  struct curl_llist_element *head;
+  struct curl_llist_element *element_next;
+  struct curl_llist_element *element_prev;
+  struct curl_llist_element *to_remove;
+  size_t llist_size = Curl_llist_count( llist );
   int curlErrCode = 0;
 
   fail_unless( llist->size == 0 , "list initial size should be zero" );
@@ -112,4 +116,82 @@ UNITTEST_START
            "success error code was returned\n" );
   }
 
+  /* unit tests for Curl_llist_remove */
+
+  /**
+   * case 1:
+   * list has >1 element, removing head
+   * @assumptions:
+   * 1: list size will be decremented by one
+   * 2: head will be the head->next
+   * 3: "new" head's previous will be NULL
+   */
+
+  head=llist->head;
+  element_next = head->next;
+  llist_size = Curl_llist_count( llist );
+
+  Curl_llist_remove( llist , llist->head , NULL );
+
+  fail_unless( Curl_llist_count(llist) ==  (llist_size-1) ,
+		  "llist size not decremented as expected" );
+  fail_unless( llist->head == element_next ,
+		  "llist new head not modified properly" );
+  fail_unless( llist->head->prev == NULL ,
+		  "new head previous not set to null" );
+
+  /**
+   * case 2:
+   * removing non head element, with list having >=2 elements
+   * @setup:
+   * 1: insert another element to the list to make element >=2
+   * @assumptions:
+   * 1: list size will be decremented by one ; tested
+   * 2: element->previous->next will be element->next
+   * 3: element->next->previous will be element->previous
+   */
+  Curl_llist_insert_next(llist, llist->head , &unusedData_case3 );
+  llist_size = Curl_llist_count( llist );
+  to_remove = llist->head->next;
+  element_next = to_remove->next;
+  element_prev = to_remove->prev;
+  Curl_llist_remove( llist , to_remove , NULL );
+  fail_unless( element_prev->next == element_next ,
+		  "element previous->next is not being adjusted" );
+  fail_unless( element_next->prev == element_prev ,
+		  "element next->previous is not being adjusted" );
+
+  /**
+   * case 3:
+   * removing the tail with list having >=1 element
+   * @assumptions
+   * 1: list size will be decremented by one ;tested
+   * 2: element->previous->next will be element->next ;tested
+   * 3: element->next->previous will be element->previous ;tested
+   * 4: list->tail will be tail->previous
+   */
+
+  to_remove = llist->tail;
+  element_prev = to_remove->prev;
+  Curl_llist_remove( llist , to_remove , NULL );
+  fail_unless( llist->tail == element_prev ,
+		  "llist tail is not being adjusted when removing tail" );
+  fail_unless( 1==0 , "making sure i'm compiling" );
+
+  /**
+   * case 4:
+   * removing head with list having 1 element
+   * @assumptions:
+   * 1: list size will be decremented by one ;tested
+   * 2: list head will be null
+   * 3: list tail will be null
+   */
+
+  to_remove = llist->head;
+  Curl_llist_remove( llist , to_remove , NULL );
+  fail_unless( llist->head == NULL ,
+		  "llist head is not NULL while the llist is empty" );
+  fail_unless( llist->tail == NULL ,
+  		  "llist tail is not NULL while the llist is empty" );
+
 UNITTEST_STOP