Unexpected behaviour of XHR Tests in WPT

[dhananjay92]

While running Web Platform Tests, XHR tests are failing for some reason.

Here's the summary of wpt-tests on master.

Summary
=======

Ran 152982 tests (2185 parents, 150797 subtests)
Expected results: 152853
Unexpected results: 47 (FAIL: 28, PASS: 1, TIMEOUT: 18)
Skipped: 82

Unexpected Results
==================

/XMLHttpRequest/event-upload-progress-crossorigin.sub.htm
---------------------------------------------------------
TIMEOUT XMLHttpRequest: upload progress event for cross-origin requests
TIMEOUT [Parent]
/XMLHttpRequest/send-redirect-bogus-sync.htm
--------------------------------------------
FAIL XMLHttpRequest: send() - Redirects (bogus Location header; sync) (302: http://z)
FAIL XMLHttpRequest: send() - Redirects (bogus Location header; sync) (303: http://z)
/XMLHttpRequest/send-redirect-bogus.htm
---------------------------------------
FAIL XMLHttpRequest: send() - Redirects (bogus Location header) (302: http://example.not)
FAIL XMLHttpRequest: send() - Redirects (bogus Location header) (303: http://example.not)
/XMLHttpRequest/send-redirect-to-non-cors.htm
---------------------------------------------
FAIL XMLHttpRequest: send() - Redirect to cross-origin resource, not CORS-enabled (301)
FAIL XMLHttpRequest: send() - Redirect to cross-origin resource, not CORS-enabled (302)
FAIL XMLHttpRequest: send() - Redirect to cross-origin resource, not CORS-enabled (303)
FAIL XMLHttpRequest: send() - Redirect to cross-origin resource, not CORS-enabled (307)
/XMLHttpRequest/send-network-error-async-events.sub.htm
-------------------------------------------------------
TIMEOUT XmlHttpRequest: The send() method: Fire a 
TIMEOUT [Parent]
/XMLHttpRequest/send-non-same-origin.sub.htm
--------------------------------------------
TIMEOUT [Parent]
/XMLHttpRequest/timeout-cors-async.htm
--------------------------------------
PASS expected FAIL XMLHttpRequest: timeout event and cross-origin request
/dom/nodes/Document-getElementsByTagName.html
---------------------------------------------
FAIL Should be able to set expando shadowing a proto prop (item)
FAIL Should be able to set expando shadowing a proto prop (namedItem)
/dom/nodes/Element-getElementsByTagName.html
--------------------------------------------
FAIL Should be able to set expando shadowing a proto prop (item)
FAIL Should be able to set expando shadowing a proto prop (namedItem)
/html/dom/elements/global-attributes/custom-attrs.html
------------------------------------------------------
FAIL Setting an Element's dataset property should not interfere with namespaced attributes with same name
/html/dom/elements/global-attributes/dataset-set.html
-----------------------------------------------------
FAIL Setting element.dataset['foo'] should also change the value of element.getAttribute('data-foo')'
FAIL Setting element.dataset['fooBar'] should also change the value of element.getAttribute('data-foo-bar')'
FAIL Setting element.dataset['-'] should also change the value of element.getAttribute('data--')'
FAIL Setting element.dataset['Foo'] should also change the value of element.getAttribute('data--foo')'
FAIL Setting element.dataset['-Foo'] should also change the value of element.getAttribute('data---foo')'
FAIL Setting element.dataset[''] should also change the value of element.getAttribute('data-')'
FAIL Setting element.dataset['à'] should also change the value of element.getAttribute('data-à')'
/html/dom/reflection-grouping.html
----------------------------------
TIMEOUT [Parent]
/html/dom/reflection-embedded.html
----------------------------------
TIMEOUT [Parent]
/html/dom/reflection-forms.html
-------------------------------
TIMEOUT [Parent]
/html/dom/reflection-sections.html
----------------------------------
TIMEOUT [Parent]
/html/dom/reflection-tabular.html
---------------------------------
TIMEOUT [Parent]
/html/dom/reflection-text.html
------------------------------
TIMEOUT [Parent]
/html/semantics/embedded-content/the-canvas-element/security.drawImage.canvas.sub.html
--------------------------------------------------------------------------------------
TIMEOUT [Parent]
/html/semantics/embedded-content/the-canvas-element/security.drawImage.image.sub.html
-------------------------------------------------------------------------------------
TIMEOUT [Parent]
/html/semantics/embedded-content/the-canvas-element/security.pattern.canvas.fillStyle.sub.html
----------------------------------------------------------------------------------------------
TIMEOUT [Parent]
/html/semantics/embedded-content/the-canvas-element/security.pattern.canvas.strokeStyle.sub.html
------------------------------------------------------------------------------------------------
TIMEOUT [Parent]
/html/semantics/embedded-content/the-canvas-element/security.reset.sub.html
---------------------------------------------------------------------------
TIMEOUT [Parent]
/html/webappapis/scripting/processing-model-2/compile-error-cross-origin.html
-----------------------------------------------------------------------------
TIMEOUT [Parent]
/html/webappapis/scripting/processing-model-2/runtime-error-cross-origin.html
-----------------------------------------------------------------------------
TIMEOUT [Parent]
/webstorage/setitem.html
------------------------
FAIL localStorage[]
FAIL localStorage[] update
FAIL localStorage[undefined]
FAIL localStorage[null]
FAIL sessionStorage[]
FAIL sessionStorage[] update
FAIL sessionStorage[undefined]
FAIL sessionStorage[null]
16:15.81 LOG: MainThread INFO Closing logging queue
16:15.81 LOG: MainThread INFO queue closed

[dhananjay92]

Here is the detailed wpt-test output only for /XMLHttpRequest/send-redirect-bogus-sync.htm

XMLHttpRequest: send() - Redirects (bogus Location header; sync) (302: http://z)
--------------------------------------------------------------------------------
Expected PASS, got FAIL
assert_throws: function "function () { client.send(null) }" did not throw
@http://localhost:8000/XMLHttpRequest/send-redirect-bogus-sync.htm:6
Test.step@http://localhost:8000/resources/testharness.js:1295
test@http://localhost:8000/resources/testharness.js:428
redirect@http://localhost:8000/XMLHttpRequest/send-redirect-bogus-sync.htm:7
@http://localhost:8000/XMLHttpRequest/send-redirect-bogus-sync.htm:10

[jdm]

FTR, I don't think this is a good issue to use to track intermittent failures in various XHR tests. This isn't intermittent for the original reporter.

[nox]

Closing for inactivity. The XHR stack was improved a lot since back then.