Enginio tst_files test fails on windows

Testing tst_Files
FAIL! : tst_Files::fileUploadDownload(Multi Part) Compared values are not the same
Actual (img.size()) : QSize(0x0)
Expected (QSize(181, 54)): QSize(181x54)
tst_files.cpp(267) : failure location
FAIL! : tst_Files::fileUploadDownload(Chunked) Compared values are not the same
Actual (img.size()) : QSize(0x0)
Expected (QSize(181, 54)): QSize(181x54)
tst_files.cpp(267) : failure location
Totals: 2 passed, 2 failed, 0 skipped
QtQA::App::TestRunner: test failed, running again to see if it is flaky...

• • • • • • • • • Start testing of tst_Files *********
                  Config: Using QtTest library 5.3.0, Qt 5.3.0
                  QDEBUG : tst_Files::initTestCase() ## Creating backend: Files1399577550311
                  QDEBUG : tst_Files::initTestCase() QJsonObject({"name":"CustomObject1","properties":[ {"indexed":false,"name":"testCase","type":"string"}

                  ,

                  {"indexed":false,"name":"title","type":"string"}

                  ,

                  {"indexed":false,"name":"count","type":"number"}

                  ,{"indexed":true,"name":"fileAttachment","objectType":"files","processors":[{"type":"image","variants":{"thumbnail":

                  {"crop":"20x20"}

                  }}],"type":"ref"}],"settings":{"websocket":true}})
                  QDEBUG : tst_Files::initTestCase() ## Creating new object type: CustomObject1 on backend: Files1399577550311
                  PASS : tst_Files::initTestCase()
                  QWARN : tst_Files::fileUploadDownload(Multi Part) Enginio: Upload must be local file.
                  WARNING: tst_Files::fileUploadDownload(Multi Part) QTest::qSleep() should have taken 10000000ns, but actually took 20343158ns!
                  qtestcase.cpp(2889) : failure location
                  FAIL! : tst_Files::fileUploadDownload(Multi Part) Compared values are not the same
                  Actual (img.size()) : QSize(0x0)
                  Expected (QSize(181, 54)): QSize(181x54)
                  tst_files.cpp(267) : failure location
                  QWARN : tst_Files::fileUploadDownload(Chunked) Enginio: Upload must be local file.
                  FAIL! : tst_Files::fileUploadDownload(Chunked) Compared values are not the same
                  Actual (img.size()) : QSize(0x0)
                  Expected (QSize(181, 54)): QSize(181x54)
                  tst_files.cpp(267) : failure location
                  QDEBUG : tst_Files::cleanupTestCase() ## Deleting backend: Files1399577550311
                  PASS : tst_Files::cleanupTestCase()
                  Totals: 2 passed, 2 failed, 0 skipped

                • Finished testing of tst_Files *********
                  QtQA::App::TestRunner: test failure could be reproduced twice consecutively
                  QtQA::App::TestRunner: end tst_files: 50 seconds, exit code 2

Build log: http://testresults.qt-project.org/ci/QtEnginio_release_Integration/build_00024/win64-msvc2013_developer-build_qtnamespace_Windows_81/log.txt.gz

Tested changes (refs/builds/release_1399576271):
http://codereview.qt-project.org/84943 [PS1] - sync.profile: Point dependencies to an empty string

We expect that it may be fixed by https://codereview.qt-project.org/#change,84492