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-rw-r--r--tests/tree.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/tests/tree.c b/tests/tree.c
index ccfb3fe..20f5ee2 100644
--- a/tests/tree.c
+++ b/tests/tree.c
@@ -39,6 +39,9 @@ START_TEST(tree_basic) {
ck_assert_int_eq(tree_balanced_insert( &root, (void**)data, keys, len ),0);
+ /* Check double insertion protection */
+ ck_assert_int_ne( tree_insert( &root, keys[0], (void*)data[0] ), 0 );
+
for ( i = 0; i < len; i++ ) {
ck_assert_str_eq( tree_get(&root, keys[i]), data[i] );
}