bluetooth: Add characteristicvaluechanged event

third_party/WebKit/LayoutTests/bluetooth/resources/bluetooth-helpers.js

 'use strict';
 
 // Sometimes we need to test that using either the name, alias, or UUID
 // produces the same result. The following objects help us do that.
 var generic_access = {
   alias: 0x1800,
   name: 'generic_access',
   uuid: '00001800-0000-1000-8000-00805f9b34fb'
 };
 var device_name = {
@@ skipping 114 matching lines @@
 }
 
 function runGarbageCollection()
 {
   // Run gc() as a promise.
   return new Promise(
       function(resolve, reject) {
         GCController.collect();
         setTimeout(resolve, 0);
       });
-  return Promise.resolve();
 }
+
+function event_after_promise(object, func, event) {

[Jeffrey Yasskin, 2015/10/15 23:00:51]

Comment what this does.

A better name might be assert_event_fires_after_promise()?

[ortuno, 2015/10/16 01:24:21]

Yeah I thought about that but I wasn't sure if I async functions should be
called assert_*.
Done though.

+  if (object[func] === undefined) {
+    return Promise.reject('Function \'' + func + '\' not available in object.');
+  }
+  let should_resolve = false;
+  let event_promise = new Promise((resolve, reject) => {
+    let event_listener = (e) => {
+      object.removeEventListener(event_listener);
+      if (should_resolve) {
+        resolve(e.target.value);
+      } else {
+        reject(event + ' was triggered before the promise resolved.');
+      }
+    };
+    object.addEventListener(event, event_listener);
+  });
+  return object[func]().then(result => {
+    should_resolve = true;
+    return Promise.all([Promise.resolve(result),
+                        event_promise]);
+  });
+}
+
+// Returns a promise that resolves after 100ms unless
+// the the event is fired on the object in which case
+// the promise rejects.
+function assert_no_events(object, event_name) {
+  return new Promise((resolve, reject) => {
+    object.addEventListener(event_name, event => {

[Jeffrey Yasskin, 2015/10/15 23:00:51]

You probably need to remove this listener, so that the object can be re-used in
a subsequent test.

[ortuno, 2015/10/16 01:24:21]

Done.

+      assert_unreached('Object should not throw an event');

[Jeffrey Yasskin, 2015/10/15 23:00:51]

s/throw/fire/, matching https://dom.spec.whatwg.org/#concept-event-fire

[ortuno, 2015/10/16 01:24:21]

Ah I was wondering what was the correct term.
Done.

+    });
+    setTimeout(resolve, 100);
+  });
+}