A tweaked version of Jeremy's patch #642489, to produce better error

messages about MRO conflicts.  (Tweaks here: don't print the message,
but compare it with an expected string.)
This commit is contained in:
Guido van Rossum 2002-11-25 21:38:52 +00:00
parent 98f3373a8c
commit d32047f038
1 changed files with 31 additions and 0 deletions

View File

@ -1054,6 +1054,36 @@ def consistency_with_epg():
(EditableScrollablePane, ScrollablePane, EditablePane,
Pane, ScrollingMixin, EditingMixin, object))
def mro_disagreement():
if verbose: print "Testing error messages for MRO disagreement..."
def raises(exc, expected, callable, *args):
try:
callable(*args)
except exc, msg:
if str(msg) != expected:
raise TestFailed, "Message %r, expected %r" % (str(msg),
expected)
else:
raise TestFailed, "Expected %s" % exc
class A(object): pass
class B(A): pass
class C(object): pass
# Test some very simple errors
raises(TypeError, "duplicate base class A",
type, "X", (A, A), {})
raises(TypeError, "MRO conflict among bases B, A",
type, "X", (A, B), {})
raises(TypeError, "MRO conflict among bases C, B, A",
type, "X", (A, C, B), {})
# Test a slightly more complex error
class GridLayout(object): pass
class HorizontalGrid(GridLayout): pass
class VerticalGrid(GridLayout): pass
class HVGrid(HorizontalGrid, VerticalGrid): pass
class VHGrid(VerticalGrid, HorizontalGrid): pass
raises(TypeError, "MRO conflict among bases VerticalGrid, HorizontalGrid",
type, "ConfusedGrid", (HVGrid, VHGrid), {})
def objects():
if verbose: print "Testing object class..."
a = object()
@ -3422,6 +3452,7 @@ def test_main():
metaclass()
pymods()
multi()
mro_disagreement()
diamond()
ex5()
monotonicity()