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Raise a meaningful error message in @image_comparison decorator #5518

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maxalbert wants to merge 2 commits into from
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Raise a meaningful error message in @image_comparison decorator #5518

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a3875dd
Raise a meaningful error message to make the use of the @image_compar…
maxalbert Nov 19, 2015
8683f54
Change exception type back to AssertionError (in a somewhat shot-in-t…
maxalbert Nov 19, 2015
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7 changes: 6 additions & 1 deletion lib/matplotlib/testing/decorators.py
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Original file line number Diff line number Diff line change
Expand Up @@ -360,7 +360,12 @@ def _image_directories(func):
# namespace package pip installed and run via the nose
# multiprocess plugin or as a specific test this may be
# missing. See https://github.com/matplotlib/matplotlib/issues/3314
assert mods.pop(0) == 'tests'
if mods[0] != 'tests':
raise AssertionError(
"Test does not live in a submodule named 'tests'. Please make "
"sure that there is a parent directory named 'tests' and that "
"it contains a __init__.py file (can be empty).")
mods.pop(0) # ignore the leading 'tests' part of the module name
subdir = os.path.join(*mods)

import imp
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