JS: Add test showing ambiguous predecessor

Author: asgerf

javascript/ql/test/library-tests/EndpointNaming/EndpointNaming.expected

@@ -1,7 +1,8 @@
 testFailures
 ambiguousPreferredPredecessor
+| pack2/lib.js:8:22:8:34 | def moduleImport("pack2").getMember("exports").getMember("lib").getMember("LibClass").getMember("foo") |
 ambiguousSinkName
 ambiguousClassObjectName
 ambiguousClassInstanceName
-ambiguousFunctionName
 failures
+ambiguousFunctionName

javascript/ql/test/library-tests/EndpointNaming/pack2/lib.js

@@ -4,3 +4,5 @@ class AmbiguousClass {
 
 export default AmbiguousClass; // $ alias=(pack2).lib.default==(pack2).lib.LibClass
 export { AmbiguousClass as LibClass }
+
+AmbiguousClass.foo = function() {} // $ method=(pack2).lib.LibClass.foo alias=(pack2).lib.default.foo==(pack2).lib.LibClass.foo