Open Radar

 
Summary:
Some of our multi-step tests with new UI testing framework will hang when attempting to find elements because of this error.

This happens simulator and device

Steps to Reproduce:
Tests will fail randomly with following error -

Test Case '-[CalendarUITest testWMCreateAndEWSReceiveMeeting]' started.
    t =     0.00s     Start Test
    t =     0.00s     Set Up
2016-01-11 14:02:22.267 XCTRunner[2470:849736] Continuing to run tests in the background with task ID 1
    t =     4.41s         Launch com.mycompany.test
    t =     4.73s             Terminate <XCUIApplicationProcess: 0x155d9d7b0 com.mycompany.test (2435)>
    t =     5.29s             Waiting for accessibility to load
    t =    14.25s             Wait for app to idle
    t =    17.31s     Tap "GrabTab" StaticText
    t =    17.31s         Wait for app to idle
    t =    17.77s         Find the "GrabTab" StaticText
    t =    17.78s             Snapshot accessibility hierarchy for com.mycompany.test
    t =    18.23s             Find: Descendants matching type StaticText
    t =    18.25s             Find: Elements matching predicate '"GrabTab" IN identifiers'
    t =    18.27s             Wait for app to idle
    t =    18.44s         Synthesize event
    t =    18.87s         Wait for app to idle
    t =    19.13s     Tap "GrabTabCalendarNavigationIdentifier" Cell
    t =    19.13s         Wait for app to idle
    t =    19.27s         Find the "GrabTabCalendarNavigationIdentifier" Cell
    t =    19.27s             Snapshot accessibility hierarchy for com.mycompany.test
    t =    19.43s             Find: Descendants matching type Cell
    t =    19.46s             Find: Elements matching predicate '"GrabTabCalendarNavigationIdentifier" IN identifiers'
    t =    19.46s             Wait for app to idle
    t =    19.60s         Synthesize event
    t =    20.00s         Wait for app to idle
    t =    21.16s     Tap "CalendarNavigationButtonIdentifier" Button
    t =    21.16s         Wait for app to idle
    t =    21.70s         Find the "CalendarNavigationButtonIdentifier" Button
    t =    21.70s             Snapshot accessibility hierarchy for com.mycompany.test
    t =    31.84s                 Assertion Failure: UI Testing Failure - Failed to get refreshed snapshot
<unknown>:0: error: -[CalendarUITest testWMCreateAndEWSReceiveMeeting] : UI Testing Failure - Failed to get refreshed snapshot
    t =    31.85s     Tear Down
Test Case '-[CalendarUITest testWMCreateAndEWSReceiveMeeting]' failed (31.856 seconds).

Expected Results:
UI Tests fails to get the snapshot of the application

Actual Results:
UI Tests should not fails with error

Version:
Xcode 7.2/7C68 & OS X 10.11.2 / 15C50