JS: Add utility for comparing results in tests

asgerf · asgerf · commit d35959a09820 · 2023-10-13T13:15:06.000+02:00
diff --git a/javascript/ql/test/testUtilities/LegacyDataFlowDiff.qll b/javascript/ql/test/testUtilities/LegacyDataFlowDiff.qll
@@ -0,0 +1,17 @@
+private import javascript
+
+private signature class LegacyConfigSig extends DataFlow::Configuration;
+
+module DataFlowDiff<DataFlow::GlobalFlowSig NewFlow, LegacyConfigSig LegacyConfig> {
+  query predicate legacyDataFlowDifference(
+    DataFlow::Node source, DataFlow::Node sink, string message
+  ) {
+    NewFlow::flow(source, sink) and
+    not any(LegacyConfig cfg).hasFlow(source, sink) and
+    message = "only flow with NEW data flow library"
+    or
+    not NewFlow::flow(source, sink) and
+    any(LegacyConfig cfg).hasFlow(source, sink) and
+    message = "only flow with OLD data flow library"
+  }
+}
