add assertOps sanitizer in cli/js/ unit tests (#4209)

* add "assertOps" test assertion which makes sure test case
  is not "leaking" ops - ie. after test finishes there are no 
  pending async ops

* apply "assertOps" to all tests in "cli/js/"

* fix numerous tests leaking ops

* document problem with edge case in "clearInterval"
   and "clearTimeout" implementation where they
   may leak async ops

* move "cli/js/worker_test.ts" to "cli/tests/worker_test.ts" and 
  run as integration test; workers leak ops because of missing
  "terminate" implementation

1 files changed, 0 insertions, 2 deletions

diff --git a/cli/tests/subdir/test_worker_basic.js b/cli/tests/subdir/test_worker_basic.js
index db00b6d0c..aef1658c0 100644
--- a/cli/tests/subdir/test_worker_basic.js
+++ b/cli/tests/subdir/test_worker_basic.js
@@ -6,12 +6,10 @@ if (self.name !== "jsWorker") {
 }
 
 onmessage = function(e) {
-  console.log("jsWorker onmessage", e.data);
   postMessage(e.data);
   close();
 };
 
 onerror = function() {
-  console.log("called onerror in worker");
   return false;
 };