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SF bug [#454456] int overflow code needs tests. 

Added tests for boundary cases in magical PEP 237 int->long auto-overflow,
but nothing here addresses the rest of the bug report so left it open.
This commit is contained in:
Tim Peters 2001-08-23 22:56:21 +00:00
parent 96685bfbf0
commit 26c7fa355a
1 changed files with 61 additions and 0 deletions
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61
Lib/test/test_long.py
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@ -255,9 +255,70 @@ def test_misc(maxdigits=MAXDIGITS):
except:
raise TestFailed, "int(long(-sys.maxint-1) - 1) didn't overflow"
# ----------------------------------- tests of auto int->long conversion
def test_auto_overflow():
import math, sys
if verbose:
print "auto-convert int->long on overflow"
special = [0, 1, 2, 3, sys.maxint-1, sys.maxint, sys.maxint+1]
sqrt = int(math.sqrt(sys.maxint))
special.extend([sqrt-1, sqrt, sqrt+1])
special.extend([-i for i in special])
def checkit(*args):
# Heavy use of nested scopes here!
verify(got == expected, "for %r expected %r got %r" %
(args, expected, got))
for x in special:
longx = long(x)
expected = -longx
got = -x
checkit('-', x)
for y in special:
longy = long(y)
expected = longx + longy
got = x + y
checkit(x, '+', y)
expected = longx - longy
got = x - y
checkit(x, '-', y)
expected = longx * longy
got = x * y
checkit(x, '*', y)
if y:
expected = longx / longy
got = x / y
checkit(x, '/', y)
expected = divmod(longx, longy)
got = divmod(longx, longy)
checkit(x, 'divmod', y)
if abs(y) < 5 and not (x == 0 and y < 0):
expected = longx ** longy
got = x ** y
checkit(x, '**', y)
for z in special:
if z != 0:
expected = pow(longx, longy, long(z))
got = pow(x, y, z)
checkit('pow', x, y, '%', z)
# ---------------------------------------------------------------- do it
test_division()
test_bitop_identities()
test_format()
test_misc()
test_auto_overflow()