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test_bug1001011(): Verify that 

s.join([t]) is t

for (s, t) in (str, str), (unicode, unicode), and (str, unicode).
For (unicode, str), verify that it's *not* t (the result is promoted
to unicode instead).  Also verify that when t is a subclass of str or
unicode that "the right thing" happens.
This commit is contained in:
Tim Peters 2004-08-27 05:36:07 +00:00
parent 894c512c2f
commit 108f137519
1 changed files with 33 additions and 5 deletions
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38
Lib/test/string_tests.py
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@ -699,14 +699,13 @@ class MixinStrUserStringTest:
class MixinStrUnicodeTest:
# Additional tests that only work with
# str and unicode
# Additional tests that only work with str and unicode.
def test_bug1001011(self):
# Make sure join returns a NEW object for single item sequences
# involving a subclass
# Make sure that it is of the appropriate type
# Check the optimisation still occurs for standard objects
# involving a subclass.
# Make sure that it is of the appropriate type.
# Check the optimisation still occurs for standard objects.
t = self.type2test
class subclass(t):
pass
@ -714,3 +713,32 @@ class MixinStrUnicodeTest:
s2 = t().join([s1])
self.assert_(s1 is not s2)
self.assert_(type(s2) is t)
s1 = t("abcd")
s2 = t().join([s1])
self.assert_(s1 is s2)
# Should also test mixed-type join.
if t is unicode:
s1 = subclass("abcd")
s2 = "".join([s1])
self.assert_(s1 is not s2)
self.assert_(type(s2) is t)
s1 = t("abcd")
s2 = "".join([s1])
self.assert_(s1 is s2)
elif t is str:
s1 = subclass("abcd")
s2 = u"".join([s1])
self.assert_(s1 is not s2)
self.assert_(type(s2) is unicode) # promotes!
s1 = t("abcd")
s2 = u"".join([s1])
self.assert_(s1 is not s2)
self.assert_(type(s2) is unicode) # promotes!
else:
self.fail("unexpected type for MixinStrUnicodeTest %r" % t)