Unable to test with TableEditor with wx on Appveyor

[kitchoi]

In two of the recent PRs (#915, #919), we started seeing this in the Appveyor build with wx:

======================================================================
ERROR: test_filtered_table_editor (traitsui.tests.editors.test_table_editor.TestTableEditor)
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Traceback (most recent call last):
  File "C:\Users\appveyor\.edm\envs\traitsui-test-3.6-wx\lib\site-packages\traitsui\tests\editors\test_table_editor.py", line 288, in test_filtered_table_editor
    filter = ui.get_editors("values")[0].filter
AttributeError: 'SimpleEditor' object has no attribute 'filter'
======================================================================
ERROR: test_table_editor_select_cell (traitsui.tests.editors.test_table_editor.TestTableEditor)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "C:\Users\appveyor\.edm\envs\traitsui-test-3.6-wx\lib\site-packages\traitsui\tests\editors\test_table_editor.py", line 489, in test_table_editor_select_cell
    selected = editor.selected_cell
AttributeError: 'SimpleEditor' object has no attribute 'selected_cell'
======================================================================
ERROR: test_table_editor_select_cell_index (traitsui.tests.editors.test_table_editor.TestTableEditor)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "C:\Users\appveyor\.edm\envs\traitsui-test-3.6-wx\lib\site-packages\traitsui\tests\editors\test_table_editor.py", line 542, in test_table_editor_select_cell_index
    selected = editor.selected_cell_index
AttributeError: 'SimpleEditor' object has no attribute 'selected_cell_index'
======================================================================

... (a couple similar ones)

The error looks like a symptom of a failure to import traitsui.wx.table_editor (see #864)

Unfortunately the build on Appveyor for wx is allowed to fail, which makes it harder to detect this sort of things early.

[kitchoi]

This may be the earliest commit where this started to happen: 717c9d3
Keep digging...

[kitchoi]

Got it. #853 added test dependencies which install the release version of pyface from PyPI. While that would have been our goal in the future, we do need pyface master for CI. When CI script gets to pip install -r ci-src-requirements.txt --no-dependencies for installing pyface master, pyface is already there and master is not installed. Then when the test tries to import traitsui.wx.table_editor, it runs into this error:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/kchoi/Work/ETS/traitsui/traitsui/wx/table_editor.py", line 35, in <module>
    from pyface.ui.wx.grid.api import Grid
  File "/Users/kchoi/.edm/envs/traitsui-test-3.6-wx/lib/python3.6/site-packages/pyface/ui/wx/grid/api.py", line 21, in <module>
    from .trait_grid_model import TraitGridModel, TraitGridColumn, \
  File "/Users/kchoi/.edm/envs/traitsui-test-3.6-wx/lib/python3.6/site-packages/pyface/ui/wx/grid/trait_grid_model.py", line 28, in <module>
    from .trait_grid_cell_adapter import TraitGridCellAdapter
  File "/Users/kchoi/.edm/envs/traitsui-test-3.6-wx/lib/python3.6/site-packages/pyface/ui/wx/grid/trait_grid_cell_adapter.py", line 22, in <module>
    from combobox_focus_handler import ComboboxFocusHandler
ModuleNotFoundError: No module named 'combobox_focus_handler'

I think these days I have been habitually reinstating a local development installation of pyface and I could have reproduced this locally.