diff options
Diffstat (limited to 'Lib')
| -rw-r--r-- | Lib/test/output/test_math | 1 | ||||
| -rw-r--r-- | Lib/test/test_math.py | 29 |
2 files changed, 30 insertions, 0 deletions
diff --git a/Lib/test/output/test_math b/Lib/test/output/test_math index 2a98000..bce7dde 100644 --- a/Lib/test/output/test_math +++ b/Lib/test/output/test_math @@ -24,3 +24,4 @@ sinh sqrt tan tanh +exceptions diff --git a/Lib/test/test_math.py b/Lib/test/test_math.py index 6d6bc44..1f31dc5 100644 --- a/Lib/test/test_math.py +++ b/Lib/test/test_math.py @@ -152,3 +152,32 @@ testit('tan(-pi/4)', math.tan(-math.pi/4), -1) print 'tanh' testit('tanh(0)', math.tanh(0), 0) testit('tanh(1)+tanh(-1)', math.tanh(1)+math.tanh(-1), 0) + +print 'exceptions' # oooooh, *this* is a x-platform gamble! good luck + +try: + x = math.exp(-1000000000) +except: + # mathmodule.c is failing to weed out underflows from libm, or + # we've got an fp format with huge dynamic range + raise TestFailed("underflowing exp() should not have rasied an exception") +if x != 0: + raise TestFailed("underflowing exp() should have returned 0") + +# If this fails, probably using a strict IEEE-754 conforming libm, and x +# is +Inf afterwards. But Python wants overflows detected by default. +try: + x = math.exp(1000000000) +except OverflowError: + pass +else: + raise TestFailed("overflowing exp() didn't trigger OverflowError") + +# If this fails, it could be a puzzle. One odd possibility is that +# mathmodule.c's CHECK() macro is getting confused while comparing +# Inf (HUGE_VAL) to a NaN, and artificially setting errno to ERANGE +# as a result (and so raising OverflowError instead). +try: + x = math.sqrt(-1.0) +except ValueError: + pass |