JS: Add test with unknown property name

Author: asgerf

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

@@ -2,6 +2,7 @@ testFailures
 | pack11/index.ts:33:1:33:16 |  | Unexpected result: method=(pack11).C3.privateField |
 | pack11/index.ts:33:18:33:69 | // $ me ... ng.name | Missing result:method=(pack11).C3.publicField.really.long.name |
 | pack11/index.ts:41:23:41:24 |  | Unexpected result: alias=(pack11).C3.publicField.really.long.name==(pack11).C3.privateField |
+| pack11/index.ts:49:12:49:53 | // $ me ... .name.m | Missing result:method=(pack11).C4.really.long.name.m |
 ambiguousPreferredPredecessor
 | pack2/lib.js:8:22:8:34 | def moduleImport("pack2").getMember("exports").getMember("lib").getMember("LibClass").getMember("foo") |
 ambiguousSinkName

javascript/ql/test/library-tests/EndpointNaming/pack11/index.ts

@@ -43,3 +43,17 @@ export class C3 {
         }
     }
 } // $ class=(pack11).C3 instance=(pack11).C3.prototype
+
+
+const f4 = {
+    m() {} // $ method=(pack11).C4.really.long.name.m
+};
+
+export const C4 = {
+    [Math.random()]: f4,
+    really: {
+        long: {
+            name: f4
+        }
+    }
+}