Add dependency to BUCK build

Change-Id: Ib1e470fa9b1cf8faf0e0686c160b5c69adfbf16f
diff --git a/web/gui/BUCK b/web/gui/BUCK
index 7230898..4b48069 100644
--- a/web/gui/BUCK
+++ b/web/gui/BUCK
@@ -13,6 +13,7 @@
 
 TEST_DEPS = [
     '//lib:TEST',
+    '//core/api:onos-api-tests',
 ]
 
 RESOURCES = [