JS: Add test

Author: asger-semmle

javascript/ql/test/library-tests/TaintTracking/BasicTaintTracking.expected

@@ -8,6 +8,7 @@ typeInferenceMismatch
 | addexpr.js:4:10:4:17 | source() | addexpr.js:7:8:7:8 | x |
 | addexpr.js:11:15:11:22 | source() | addexpr.js:21:8:21:12 | value |
 | advanced-callgraph.js:2:13:2:20 | source() | advanced-callgraph.js:6:22:6:22 | v |
+| array-callback.js:2:23:2:30 | source() | array-callback.js:4:10:4:10 | x |
 | booleanOps.js:2:11:2:18 | source() | booleanOps.js:4:8:4:8 | x |
 | booleanOps.js:2:11:2:18 | source() | booleanOps.js:13:10:13:10 | x |
 | booleanOps.js:2:11:2:18 | source() | booleanOps.js:19:10:19:10 | x |

javascript/ql/test/library-tests/TaintTracking/array-callback.js

@@ -0,0 +1,6 @@
+async function test() {
+  let promisedTaint = source();
+  (await promisedTaint).map(x => {
+    sink(x); // NOT OK
+  });
+}