JS: Add test case

Author: asgerf

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

@@ -0,0 +1,2 @@
+| destructuring-export-client.js:3:8:3:41 | // trac ... ort-foo | Failed to track destructuring-export-foo here. |
+| destructuring-export-client.js:4:8:4:41 | // trac ... ort-bar | Failed to track destructuring-export-bar here. |

javascript/ql/test/library-tests/TypeTracking/destructuring-export-client.js

@@ -0,0 +1,4 @@
+import { foo, bar } from './destructuring-export';
+
+foo(); // track: destructuring-export-foo
+bar(); // track: destructuring-export-bar

javascript/ql/test/library-tests/TypeTracking/destructuring-export.js

@@ -0,0 +1,4 @@
+export const {
+    foo, // name: destructuring-export-foo
+    bar, // name: destructuring-export-bar
+} = new Something();