1048551 - using By.CSS_SELECTOR sometimes returns "JavascriptException: No such strategy"

Status: RESOLVED DUPLICATE of bug 1094441

(Remote Protocol :: Marionette, defect)

Description

[Dan Mosedale (:dmosedale, :dmose)]

This shouldn't be possible, I don't think.  More details here once I have code to link to.

Comment 1

[Zac C (:zac)]

I only get this when I've spelt CSS_SELECTOR wrong :D

Comment 2

[Dan Mosedale (:dmosedale, :dmose)]

Zac: :-)

Sorry for not filling in the details sooner.  Here they are:

Configuring and running functional tests in Loop is (partly) described at <http://mxr.mozilla.org/mozilla-central/source/browser/components/loop/README.txt#25>.  Feel free to reach out to me in IRC for more help at any time.  :mdas also has a tree configured, I believe.

<http://mxr.mozilla.org/mozilla-central/source/browser/components/loop/test/functional/test_1_browser_call.py#80>

has the code in question.

The line currently in the code:

  url_input_element = self.wait_for_element_displayed(By.CLASS_NAME, "callUrl")

works just fine, but it's making our code more fragile than it needs to be, because we don't really need to expose this class name at all, we want something fetched by a relatively complex selector.  Unfortunately, using any selector at all makes Marionette fall over.  Switching that line to be:

  url_input_element = self.wait_for_element_displayed(By.CSS_SELECTOR, ".callUrl")

Makes the test fail with this output:
 
env LOOP_SERVER=/Users/dmose/r/loop-server mach marionette-test browser/components/loop/test/functional/manifest.ini 
 0:06.19 LOG: MainThread INFO starting httpd
 0:06.19 LOG: MainThread INFO running webserver on http://127.0.0.1:54425/
 0:06.19 SUITE_START: MainThread 1
 0:06.20 TEST_START: MainThread test_1_browser_call.py Test1BrowserCall.test_1_browser_call
Server listening on http://localhost:5001
node server.js
Serving repository root over HTTP at http://localhost:3001/
Static contents are available at http://localhost:3001/content/
Tests are viewable at http://localhost:3001/test/
Use this for development only.
 0:13.02 TEST_END: MainThread ERROR, expected PASS
Traceback (most recent call last):
  File "/Users/dmose/r/gecko-dev/testing/marionette/client/marionette/marionette_test.py", line 171, in run
    testMethod()
  File "/Users/dmose/r/gecko-dev/browser/components/loop/test/functional/test_1_browser_call.py", line 149, in test_1_browser_call
    call_url = self.get_and_verify_call_url()
  File "/Users/dmose/r/gecko-dev/browser/components/loop/test/functional/test_1_browser_call.py", line 87, in get_and_verify_call_url
    url_input_element = self.wait_for_element_displayed(By.CSS_SELECTOR, ".callUrl")
  File "/Users/dmose/r/gecko-dev/browser/components/loop/test/functional/test_1_browser_call.py", line 39, in wait_for_element_displayed
    .until(lambda m: m.find_element(by, locator).is_displayed())
  File "/Users/dmose/r/gecko-dev/testing/marionette/client/marionette/wait.py", line 122, in until
    rv = condition(self.marionette)
  File "/Users/dmose/r/gecko-dev/browser/components/loop/test/functional/test_1_browser_call.py", line 39, in <lambda>
    .until(lambda m: m.find_element(by, locator).is_displayed())
  File "/Users/dmose/r/gecko-dev/testing/marionette/client/marionette/marionette.py", line 1278, in find_element
    response = self._send_message('findElement', 'value', **kwargs)
  File "/Users/dmose/r/gecko-dev/testing/marionette/client/marionette/decorators.py", line 35, in _
    return func(*args, **kwargs)
  File "/Users/dmose/r/gecko-dev/testing/marionette/client/marionette/marionette.py", line 638, in _send_message
    self._handle_error(response)
  File "/Users/dmose/r/gecko-dev/testing/marionette/client/marionette/marionette.py", line 686, in _handle_error
    raise errors.JavascriptException(message=message, status=status, stacktrace=stacktrace)
JavascriptException: JavascriptException: No such strategy.


 0:13.09 LOG: MainThread INFO 
SUMMARY
-------
 0:13.09 LOG: MainThread INFO passed: 0
 0:13.09 LOG: MainThread INFO failed: 1
 0:13.09 LOG: MainThread INFO todo: 0
 0:13.09 LOG: MainThread INFO 
FAILED TESTS
-------
 0:13.09 LOG: MainThread INFO test_1_browser_call.py test_1_browser_call.Test1BrowserCall.test_1_browser_call
 0:13.11 SUITE_END: MainThread 
Summary
=======

Ran 1 tests
Expected results: 0
Unexpected results: 1 (ERROR: 1)

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

ERROR test_1_browser_call.py Test1BrowserCall.test_1_browser_call