uia('uia.alert().defaultButton().tap()') command fails with an error on 8.0 simulator

[JaniJegoroff]

uia('uia.alert().defaultButton().tap()') command fails on 8.0 simulator with an error. Same command works fine in 7.1 simulator.

Environment:
Calabash 0.11.0
run_loop 1.0.9
Xcode 6.0.1
iPad Retina (8.0 Simulator)

Steps to reproduce:

1. Build app to iPad Retina 8.0 simulator
2. Execute: DEBUG=1 DEVICE_TARGET='iPad Retina (8.0 Simulator)' calabash-ios console
3. Execute: start_test_server_in_background
4. Open alert view in your app
5. Execute: uia('uia.alert().defaultButton().tap()')

Expected result:
5. Command is executed successfully and default button is tapped in alert view

Actual result:
5. Command fails with an error

Console trace:

janis-air:myApp janijegoroff$ DEBUG=1 DEVICE_TARGET='iPad Retina (8.0 Simulator)' calabash-ios console
Running irb...
irb(main):001:0> start_test_server_in_background

INFO: Using uia strategy: 'preferences'
Sending 'QUIT' to instruments process '78036'
Waiting for instruments '78036' to terminate
Preparation took 3.135206 seconds
{
                        :app => "/Users/janijegoroff/Library/Developer/Xcode/DerivedData/myApp-civuqgdjemtasdaqyhpsrgakmnyv/Build/Products/Calabash-iphonesimulator/myApp.app",
                       :args => [],
    :bundle_dir_or_bundle_id => "/Users/janijegoroff/Library/Developer/Xcode/DerivedData/myApp-civuqgdjemtasdaqyhpsrgakmnyv/Build/Products/Calabash-iphonesimulator/myApp.app",
                  :bundle_id => "my-bundle-id",
                     :device => "iphone",
              :device_target => "iPad Retina (8.0 Simulator)",
              :launch_method => :instruments,
             :launch_retries => 5,
                   :log_file => "/var/folders/66/62hrz8650r72_srksbdfwpjm0000gn/T/run_loop20141014-78698-x42grc/run_loop.out",
                  :no_launch => false,
                    :no_stop => false,
                      :reset => false,
                :results_dir => "/var/folders/66/62hrz8650r72_srksbdfwpjm0000gn/T/run_loop20141014-78698-x42grc",
          :results_dir_trace => "/var/folders/66/62hrz8650r72_srksbdfwpjm0000gn/T/run_loop20141014-78698-x42grc/trace",
                     :script => "/var/folders/66/62hrz8650r72_srksbdfwpjm0000gn/T/run_loop20141014-78698-x42grc/_run_loop.js",
                :sdk_version => nil,
                       :udid => "iPad Retina (8.0 Simulator)",
               :uia_strategy => :preferences,
                      :xcode => "6.0.1",
                 :xcode_path => "/Applications/Xcode601/Xcode.app/Contents/Developer"
}

### Starting on iPad Retina (8.0 Simulator) App: /Users/janijegoroff/Library/Developer/Xcode/DerivedData/myApp-civuqgdjemtasdaqyhpsrgakmnyv/Build/Products/Calabash-iphonesimulator/myApp.app ###
2014-10-14 11:18:45 +0100 xcrun instruments -w "iPad Retina (8.0 Simulator)" -D "/var/folders/66/62hrz8650r72_srksbdfwpjm0000gn/T/run_loop20141014-78698-x42grc/trace" -t "Automation" "/Users/janijegoroff/Library/Developer/Xcode/DerivedData/myApp-civuqgdjemtasdaqyhpsrgakmnyv/Build/Products/Calabash-iphonesimulator/myApp.app" -e UIARESULTSPATH /var/folders/66/62hrz8650r72_srksbdfwpjm0000gn/T/run_loop20141014-78698-x42grc -e UIASCRIPT /var/folders/66/62hrz8650r72_srksbdfwpjm0000gn/T/run_loop20141014-78698-x42grc/_run_loop.js  &> /var/folders/66/62hrz8650r72_srksbdfwpjm0000gn/T/run_loop20141014-78698-x42grc/run_loop.out
Launching took 7.274896 seconds
Calabash::Cucumber::Launcher: Launch Method instruments
Log file: /var/folders/66/62hrz8650r72_srksbdfwpjm0000gn/T/run_loop20141014-78698-x42grc/run_loop.out
irb(main):002:0> uia('uia.alert().defaultButton().tap()')
{
       "status" => "error",
        "value" => "VerboseError: Cannot perform action on invalid element: UIAElementNil from target.frontMostApp().alert().defaultButton()",
    "backtrace" => "tap@[native code]\neval code\neval@[native code]\nglobal code@file:///Users/janijegoroff/myApp/66BB437F-FB56-467A-9C62-34F50B6747FC/_run_loop.js:23632:27",
        "index" => 0
}
irb(main):003:0>

run_loop trace:

janis-air:myApp janijegoroff$ cat /var/folders/66/62hrz8650r72_srksbdfwpjm0000gn/T/run_loop20141014-78698-x42grc/run_loop.out
Waiting for device to boot...
2014-10-14 10:18:52 +0000 Default: OUTPUT_JSON:
{"status":"success","value":true,"index":0}
END_OUTPUT
2014-10-14 10:18:52 +0000 Default: **************
2014-10-14 10:19:12 +0000 Default: OUTPUT_JSON:
{"output":{"output":"on alert"},"last_index":0}
END_OUTPUT
2014-10-14 10:19:12 +0000 Default: **************
2014-10-14 10:19:23 +0000 Default: OUTPUT_JSON:
{"output":{"output":"alert: null"},"last_index":0}
END_OUTPUT
2014-10-14 10:19:23 +0000 Default: **************
2014-10-14 10:19:27 +0000 Default: index 0 is command: uia.alert().defaultButton().tap()
2014-10-14 10:19:27 +0000 Debug: Cannot perform action on invalid element: UIAElementNil from target.frontMostApp().alert().defaultButton()
2014-10-14 10:19:27 +0000 Default: OUTPUT_JSON:
{"output":{"output":"Failure: VerboseError: Cannot perform action on invalid element: UIAElementNil from target.frontMostApp().alert().defaultButton()  tap@[native code]\neval code\neval@[native code]\nglobal code@file:///Users/janijegoroff/myApp/66BB437F-FB56-467A-9C62-34F50B6747FC/_run_loop.js:23632:27"},"last_index":0}
END_OUTPUT
2014-10-14 10:19:27 +0000 Default: **************
2014-10-14 10:19:27 +0000 Default: Write result...
2014-10-14 10:19:27 +0000 Default: Check successful storage...
2014-10-14 10:19:27 +0000 Default: Storage succeeded: 0
janis-air:myApp janijegoroff$

[krukow]

I've reproduced this! My conclusion is that it is a bug in UIAutomation.

You can verify it by running this script which doesn't involve Calabash:

UIALogger.logMessage("Start");

UIATarget.onAlert = function(alertViewShown) {
    UIALogger.logMessage("Saw alert view with: " + alertViewShown.buttons().length + " buttons");
    return true;
};

target = UIATarget.localTarget();

app = target.frontMostApp();

UIALogger.logMessage("Tapping alert view button");

// activate your alert view
// manually or using UIAutomation

target.delay(5); //manual case



app = target.frontMostApp();

UIALogger.logMessage("app: "+app.bundleID()+ " "+ app.version());

UIALogger.logWarning("alert view: " + app.alert() + " default button "+app.alert().defaultButton());

UIALogger.logWarning("alert view: " + app.alert() + " cancel button "+app.alert().cancelButton());

output (notice that we can detect two buttons but default and cancel both return a nil element).

➜  XMSample git:(master) ✗ xcrun instruments -w "2471BD90-9A5E-484A-B31B-2B65CA39FBAE" -t "Automation" "com.xamarin.XMSample" -e UIASCRIPT alert-bug.js
2014-10-21 23:57:59 +0000 Default: Start
2014-10-21 23:57:59 +0000 Default: Tapping alert view button
2014-10-21 23:58:04 +0000 Default: app: com.xamarin.XMSample 1.0
2014-10-21 23:58:14 +0000 Warning: alert view: [object UIAElementNil] default button [object UIAElementNil]
2014-10-21 23:58:25 +0000 Warning: alert view: [object UIAElementNil] cancel button [object UIAElementNil]
Instruments Trace Complete (Duration : 30.579439s; Output : /Users/krukow/code/calabash-ios-xamarin-example/XMSample/instrumentscli8.trace)

My conclusion is that this is (another) bug in UIAutomation in 8.0 and above that.

Closing. Please re-open if you disagree.

@jmoody could you file an rdar?

[jmoody]

Re-opening until I file the radar - otherwise I will forget.

[janmichaelkolbe]

Hi! Have you already reported this to Apple?

[jmoody]

Works in Xcode 7.