Added insert function, not tested yet, tests for delete have been made and all succeded

tests/test_linkedlist.c

@@ -43,10 +43,60 @@ static void linkedlist_test_delete_head(void **state) {
     linkedlist_destroy(ll);
 }
 
+static void linkedlist_test_delete_end(void **state) {
+    (void) state;
+
+    LinkedList *ll;
+    linkedlist_create(&ll, sizeof(int));
+    for (int i = 0; i < 3; i++) {
+        linkedlist_append(ll, &i);
+    }
+
+    linkedlist_delete(ll, 2);
+
+    size_t len;
+    linkedlist_len(ll, &len);
+    assert_int_equal(len, 2);
+
+    for (int i = 0; i < 2; i++) {
+        int n;
+        linkedlist_get(ll, i, &n);
+        assert_int_equal(n, i);
+    }
+    linkedlist_destroy(ll);
+}
+
+static void linkedlist_test_delete_middle(void **state) {
+    (void) state;
+
+    LinkedList *ll;
+    linkedlist_create(&ll, sizeof(int));
+    for (int i = 0; i < 3; i++) {
+        linkedlist_append(ll, &i);
+    }
+
+    linkedlist_delete(ll, 1);
+
+    size_t len;
+    linkedlist_len(ll, &len);
+    assert_int_equal(len, 2);
+
+    int n1;
+    int n2;
+    linkedlist_get(ll, 0, &n1);
+    linkedlist_get(ll, 1, &n2);
+    assert_int_equal(n1, 0);
+    assert_int_equal(n2, 2);
+
+    linkedlist_destroy(ll);
+}
+
 int main(void) {
     const struct CMUnitTest tests[] = {
         cmocka_unit_test(linkedlist_test_append_3_int),
         cmocka_unit_test(linkedlist_test_delete_head),
+        cmocka_unit_test(linkedlist_test_delete_end),
+        cmocka_unit_test(linkedlist_test_delete_middle),   
     };
 
     return cmocka_run_group_tests(tests, NULL, NULL);