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[Andrea Bernabei <andrea.bernabei@xxxxxxxxxxxxx>]

** Also affects: canonical-devices-system-image
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1549256

Title:
  UbuntuTestCase's flick() function is unreliable, does not always flick
  a Flickable

Status in Canonical System Image:
  New
Status in ubuntu-ui-toolkit package in Ubuntu:
  Fix Committed

Bug description:
  revision 1864

  System setup: Vivid + Overlay PPA (i.e. same as phones/tablets)

  libqt5qml5:
    Installed: 5.4.1-1ubuntu11~overlay3
  libqt5core5a:
    Installed: 5.4.1+dfsg-2ubuntu11~vivid4

  UbuntuTestCase provides a flick() function whose main purpose is to
  produce a flick event when executed on Flickable.

  I noticed that this does not always happen, causing flakiness of some
  of the UITK tests (in my case, it's the Scrollbar/ScrollView tests I'm
  working on)

  Here is a test case that reproduces the issue, once every 10-200 runs,
  depending on the configuration (I use a simple script to run it until
  it fails)

  Please note that uncommenting the debug lines such as onMovingChanged
  onFlickingChanged will make it harder to reproduce the bug.

  Enabling QT_LOGGING_RULES="qt.quick.mouse.debug=true" or
  onContentYChanged will make it even harder.

  Since I already went through the effort, I'm posting here the debug log coming from the failed and successful runs:
  - Typical failed run ---> http://pastebin.ubuntu.com/15186789/ Note how "flicking" never becomes true
  - Typical successful run ---> http://pastebin.ubuntu.com/15186784/

  - Failed test with qt.quick.mouse.debug=true  --> http://pastebin.ubuntu.com/15186851/
  - Successful test with qt.quick.mouse.debug=true -> http://pastebin.ubuntu.com/15186853/

  Here's the code I used to reproduce the bug:

  import QtQuick 2.4
  import QtTest 1.0
  import Ubuntu.Test 1.0
  import Ubuntu.Components 1.3
  import Ubuntu.Components.Styles 1.3
  import QtQml.Models 2.1

  Item {
      id: main
      width: units.gu(50)
      height: units.gu(100)

      SignalSpy {
          id: signalSpy
      }
      SignalSpy {
          id: anotherSignalSpy
      }

      Item {
          anchors.fill: parent
          Item {
              width: units.gu(20)
              height: units.gu(30)
              property alias flickable: freshFlickable
              Flickable {
                  id: freshFlickable
                  anchors.fill: parent
                  contentHeight: content.height
                  contentWidth: content.width
                  clip: true
                  //onContentYChanged: console.log(contentY)
                  //onMovingChanged: console.log("MOVING", moving)
                  //onFlickingChanged: console.log("FLICKING", flicking)
                  Rectangle {
                      id: content
                      width: units.gu(40)
                      height: units.gu(200)
                      color: "blue"
                  }
              }
          }
      }

      UbuntuTestCase {
          name: "FlickBug"
          when: windowShown

          function setupSignalSpy(spy, target, signalName) {
              spy.clear()
              //reset signalName otherwise it will look for the old signalName in the new target
              spy.signalName = ""
              spy.target = target
              spy.signalName = signalName
          }

          function test_flickUbuntuTestCase() {
              setupSignalSpy(signalSpy, freshFlickable, "movingChanged")
              flick(freshFlickable, 50, 50, -units.gu(10), -units.gu(10))
              signalSpy.wait()
              compare(signalSpy.count, 1, "No movingChanged signal after simulating a flick.")
          }
      }
  }

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