1 files changed, 2 insertions, 7 deletions
diff --git a/Computer_Science/data_structures/chapter_4/binary_search_tree.c b/Computer_Science/data_structures/chapter_4/binary_search_tree.c
index fb61e7b..b498d54 100644
--- a/Computer_Science/data_structures/chapter_4/binary_search_tree.c
+++ b/Computer_Science/data_structures/chapter_4/binary_search_tree.c
@@ -5,13 +5,6 @@
 #include "binary_search_tree.h"
 #include "print_ascii_tree.h"
 
-struct TreeNode
-{
-    elem_t elem;
-    SearchTree left;
-    SearchTree right;
-};
-
 SearchTree make_empty(SearchTree t)
 {
     if(t != NULL) {
@@ -125,6 +118,8 @@ void test()
     insert(3, t);
     insert(2, t);
     insert(10, t);
+    insert(12, t);
+    insert(-1, t);
 
     print_tree_pre_order(t);
     printf("\n");