Setup Appveyor

[rahulporuri]

The appveyor related additions made in this PR are based on the appveyor setup in traitsui.

• the edm version used in 1.9.1 while travis uses 1.11.0
• tests are run on python 2.7, 3.5 and 3.6 with the toolkits null, pyqt on all runtimes and pyside, wx on python 2 specifically, like travis.

Edit: closes #377

[rahulporuri]

Note that both the 3.5 and 3.6 appveyor CI jobs finished running the tests successfully but they are marked as failures because of these tracebacks which appear when running the test suite

appveyor-run.cmd test %runtime% %toolkits%
Running tests in 'chaco-test-3.5-null'
copying file to tempdir: .coveragerc
[EXECUTING] edm run -e chaco-test-3.5-null -- coverage run -m unittest discover -v chaco
Could not covert font to FontEntry for file c:\windows\fonts\ebrima.ttf
Traceback (most recent call last):
  File "c:\users\appveyor\.edm\envs\chaco-test-3.5-null\lib\site-packages\kiva\fonttools\font_manager.py", line 1440, in <module>
    fontManager = pickle_load(_fmcache)
  File "c:\users\appveyor\.edm\envs\chaco-test-3.5-null\lib\site-packages\kiva\fonttools\font_manager.py", line 1050, in pickle_load
    fh = open(filename, 'rb')
FileNotFoundError: [Errno 2] No such file or directory: 'C:\\Users\\appveyor\\AppData\\Roaming\\Enthought\\kiva\\fontList.cache'

[rahulporuri]

OTOH, on Python 2, we don't see the font-related tracebacks but we do see the following traceback after all of the testsuites are run, which I guess is being interpreted as a failed job

Error in atexit._run_exitfuncs:
Traceback (most recent call last):
  File "c:\users\appveyor\.edm\envs\chaco-test-2.7-wx\lib\atexit.py", line 24, in _run_exitfuncs
    func(*targs, **kargs)
PyAssertionError: C++ assertion "GetEventHandler() == this" failed at ..\..\src\common\wincmn.cpp(478) in wxWindowBase::~wxWindowBase(): any pushed event handlers must have been removed
Error in sys.exitfunc:
Traceback (most recent call last):
  File "c:\users\appveyor\.edm\envs\chaco-test-2.7-wx\lib\atexit.py", line 24, in _run_exitfuncs
    func(*targs, **kargs)
wx._core.PyAssertionError: C++ assertion "GetEventHandler() == this" failed at ..\..\src\common\wincmn.cpp(478) in wxWindowBase::~wxWindowBase(): any pushed event handlers must have been removed

[jvkersch]

@rahulporuri Thanks for picking this up, this is great!

Do you have any spare cycles to investigate those two tracebacks further?

[rahulporuri]

Do you have any spare cycles to investigate those two tracebacks further?

I don't really know where the start.

[jvkersch]

I don't really know where the start.

Hah, neither do I -- I was hoping you did :-) I've never seen the FileNotFoundError, but the C++ cleanup issue comes up on other platforms as well. I'll do some digging (time permitting) and maybe we can compare notes later on and see if we get anywhere?

[corranwebster]

The second traceback is a WxPython issue caused by not properly disconnecting event handlers. If I recall, @RobinD42 fixed this in TraitsUI with this PR enthought/traitsui#108 . A similar fix may be needed in Enable?

Both of these tracebacks are almost certainly Enable/Kiva problems not Chaco bugs.

[rahulporuri]

@jvkersch I haven't been able to spend time investigating the tracebacks in the CI. Are you okay with merging this PR and opening issues to investigate the tracebacks?

[jvkersch]

Are you okay with merging this PR and opening issues to investigate the tracebacks?

Sounds good! Merge away.

[rahulporuri]

merging now that the webhook for appveyor has been added