Fix warnings in test suite

[rahulporuri]

There is a good amount of noise in the testsuite output, some of which are deprecations which we will want to fix and some of which are non-issues which we can't do anything about.

• pyface\tasks\tests\test_editor_area_pane.py:27: DeprecationWarning: Please use assertTrue instead. self.assert_(isinstance(area.create_editor(0), Editor))
• pyface\tasks\tests\test_topological_sort.py:84: DeprecationWarning: Please use assertTrue instead. self.assert_(not has_cycles)
• pyface\qt\QtScript.py:18: DeprecationWarning: QtScript is not supported in PyQt5 warnings.warn(DeprecationWarning("QtScript is not supported in PyQt5"))
• pyface.ui.qt4.tests.test_message_dialog.TestMessageDialog.test_escape_button_no_details: ResourceWarning: unclosed file<_io.BufferedRandom name='C:\Users\rporuri\AppData\Local\Temp\file0'>, unclosed file <_io.BufferedRandom name='C:\Users\rporuri\AppData\Local\Temp\file1'>, unclosed file <_io.BufferedRandom name='C:\Users\rporuri\AppData\Local\Temp\file2'>
• test_combo_field_icon_formatter (pyface.fields.tests.test_combo_field.TestComboField) ... C:\Users\rporuri.edm\envs\pyface-test-3.6-pyqt5\lib\site-packages\pkg_resources_init_.py:1157: DeprecationWarning: Use of .. or absolute path in a resource path is not allowed and will raise exceptions in a future release. (see ImageResource locate image triggers deprecation warning #587 )

Full test output below

>python -m unittest discover pyface
......................................................................................Did not find name 'fallback' on <pyface.action.tests.test_listening_action.WatchedObject object at 0x0000011C47861A98>
........C:\Users\rporuri\.edm\envs\pyface-release-test\lib\site-packages\traitsui\ui_traits.py:56: DeprecationWarning: 'TraitPrefixList' trait handler has been deprecated. Use PrefixList instead.
  Orientation = Trait("vertical", TraitPrefixList("vertical", "horizontal"))
C:\Users\rporuri\.edm\envs\pyface-release-test\lib\site-packages\traitsui\ui_traits.py:60: DeprecationWarning: 'TraitPrefixList' trait handler has been deprecated. Use PrefixList instead.
  "simple", TraitPrefixList("simple", "custom", "text", "readonly"), cols=4
C:\Users\rporuri\.edm\envs\pyface-release-test\lib\site-packages\traitsui\ui_traits.py:65: DeprecationWarning: 'TraitPrefixList' trait handler has been deprecated. Use PrefixList instead.
  "normal", TraitPrefixList("normal", "split", "tabbed", "flow", "fold")
C:\Users\rporuri\.edm\envs\pyface-release-test\lib\site-packages\traitsui\editors\api.py:15: ImportWarning: ArrayEditor is not available due to missing numpy
  "ArrayEditor is not available due to missing numpy", ImportWarning
C:\Users\rporuri\.edm\envs\pyface-release-test\lib\site-packages\traitsui\view.py:121: DeprecationWarning: 'TraitPrefixList' trait handler has been deprecated. Use PrefixList instead.
  "wizard",
C:\Users\rporuri\.edm\envs\pyface-release-test\lib\site-packages\traits\traits.py:330: DeprecationWarning: 'TraitMap' trait handler has been deprecated. Use Map instead.
  other.append(TraitMap(map))
.......C:\Users\rporuri\.edm\envs\pyface-release-test\lib\site-packages\pkg_resources\__init__.py:1157: DeprecationWarning: Use of .. or absolute path in a resource path is not allowed and will raise exceptions in a future release.
  self, resource_name
...............................C:\Users\rporuri\work\github\ets\pyface\pyface\tasks\tests\test_editor_area_pane.py:27: DeprecationWarning: Please use assertTrue instead.
  self.assert_(isinstance(area.create_editor(0), Editor))
..ssssss..........................C:\Users\rporuri\work\github\ets\pyface\pyface\tasks\tests\test_topological_sort.py:84: DeprecationWarning: Please use assertTrue instead.
  self.assert_(not has_cycles)
.............---- ApplicationExit raised ----
Traceback (most recent call last):
  File "C:\Users\rporuri\work\github\ets\pyface\pyface\application.py", line 174, in run
    run = self._run()
  File "C:\Users\rporuri\work\github\ets\pyface\pyface\tests\test_application.py", line 72, in _run
    raise ApplicationExit("error message")
pyface.application.ApplicationExit: error message
..Error preparing for application exit
Traceback (most recent call last):
  File "C:\Users\rporuri\work\github\ets\pyface\pyface\application.py", line 215, in exit
    self._prepare_exit()
  File "C:\Users\rporuri\work\github\ets\pyface\pyface\tests\test_application.py", line 84, in _prepare_exit
    raise Exception("Exit preparation failed")
Exception: Exit preparation failed
............QWindowsWindow::setGeometry: Unable to set geometry 100x100+960+455 (frame: 118x147+951+417) on QWidgetWindow/"ApplicationWindowWindow" on "\\.\DISPLAY1". Resulting geometry: 148x100+960+455 (frame: 166x147+951+417) margins: 9, 38, 9, 9)
...............s...ssss.ssss............s..ss.s.s.......s..s..sss...................Error preparing for application exit
Traceback (most recent call last):
  File "C:\Users\rporuri\work\github\ets\pyface\pyface\application.py", line 215, in exit
    self._prepare_exit()
  File "C:\Users\rporuri\work\github\ets\pyface\pyface\tests\test_gui_application.py", line 105, in _prepare_exit
    raise Exception("Exit preparation failed")
Exception: Exit preparation failed
...........................ss........ss.s..........s....s...............................................................................................................................ssss..s..s...QWindowsWindow::setGeometry: Unable to set geometry 100x100+960+455 (frame: 118x147+951+417) on QWidgetWindow/"QMainWindowClassWindow" on "\\.\DISPLAY1". Resulting geometry: 148x100+960+455 (frame: 166x147+951+417) margins: 9, 38, 9, 9)
.......s......................................C:\Users\rporuri\work\github\ets\pyface\pyface\ui\qt4\util\gui_test_assistant.py:71: ResourceWarning: unclosed file <_io.BufferedRandom name='C:\\Users\\rporuri\\AppData\\Local\\Temp\\file0'>
  if not gc.collect():
C:\Users\rporuri\work\github\ets\pyface\pyface\ui\qt4\util\gui_test_assistant.py:71: ResourceWarning: unclosed file <_io.BufferedRandom name='C:\\Users\\rporuri\\AppData\\Local\\Temp\\file1'>
  if not gc.collect():
C:\Users\rporuri\work\github\ets\pyface\pyface\ui\qt4\util\gui_test_assistant.py:71: ResourceWarning: unclosed file <_io.BufferedRandom name='C:\\Users\\rporuri\\AppData\\Local\\Temp\\file2'>
  if not gc.collect():
..C:\Users\rporuri\work\github\ets\pyface\pyface\ui\qt4\mimedata.py:66: RuntimeWarning: Could not pickle dragged object <function PyMimeDataTestCase.test_cant_pickle.<locals>.<lambda> at 0x0000011C47B85AE8>, using application/x-ets-qt4-instance-no-pickle mimetype instead
  RuntimeWarning,
.........C:\Users\rporuri\work\github\ets\pyface\pyface\ui\qt4\mimedata.py:66: RuntimeWarning: Could not pickle dragged object <function PyMimeDataTestCase.test_coerce_unpicklable.<locals>.<lambda> at 0x0000011C47B85AE8>, using application/x-ets-qt4-instance-no-pickle mimetype instead
  RuntimeWarning,
..................C:\Users\rporuri\work\github\ets\pyface\pyface\qt\QtScript.py:18: DeprecationWarning: QtScript is not supported in PyQt5
  warnings.warn(DeprecationWarning("QtScript is not supported in PyQt5"))
E........ssssssssssssss.....

[rahulporuri]

#526 and #527 reported parts of these earlier

[kitchoi]

Oops, sorry I just noticed that #587 duplicates part of this. Please feel free to close that one as duplicate.