In the current testing setup for tree_search(), the case for
non-existent key is not exercised. Improve this by adding a
test-case for the same.

Mentored-by: Patrick Steinhardt [off-list ref]
Mentored-by: Christian Couder [off-list ref]
Signed-off-by: Chandra Pratap <redacted>
---
 t/unit-tests/t-reftable-tree.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/t/unit-tests/t-reftable-tree.c b/t/unit-tests/t-reftable-tree.c
index 78d5caafbe..b2fca0cb5e 100644
--- a/t/unit-tests/t-reftable-tree.c
+++ b/t/unit-tests/t-reftable-tree.c

@@ -44,6 +44,7 @@ static void test_tree_search(void)
 		check_pointer_eq(nodes[i], tree_search(values + i, &root, &test_compare, 0));
 	}
 
+	check(!tree_search(values, &root, &test_compare, 0));
 	tree_free(root);
 }
 

-- 
2.45.2.404.g9eaef5822c