diff options
Diffstat (limited to 'Lib/test/test_decimal.py')
| -rw-r--r-- | Lib/test/test_decimal.py | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/Lib/test/test_decimal.py b/Lib/test/test_decimal.py index 9f3d104e5d..c9a096a86d 100644 --- a/Lib/test/test_decimal.py +++ b/Lib/test/test_decimal.py @@ -42,6 +42,12 @@ except ImportError: # Useful Test Constant Signals = tuple(getcontext().flags.keys()) +# Signals ordered with respect to precedence: when an operation +# produces multiple signals, signals occurring later in the list +# should be handled before those occurring earlier in the list. +OrderedSignals = (Clamped, Rounded, Inexact, Subnormal, + Underflow, Overflow, DivisionByZero, InvalidOperation) + # Tests are built around these assumed context defaults. # test_main() restores the original context. def init(): @@ -352,6 +358,25 @@ class DecimalTest(unittest.TestCase): else: self.fail("Did not raise %s in %s" % (error, s)) self.context.traps[error] = 0 + + # as above, but add traps cumulatively, to check precedence + ordered_errors = [e for e in OrderedSignals if e in theirexceptions] + for error in ordered_errors: + self.context.traps[error] = 1 + try: + funct(*vals) + except error: + pass + except Signals, e: + self.fail("Raised %s in %s; expected %s" % + (type(e), s, error)) + else: + self.fail("Did not raise %s in %s" % (error, s)) + # reset traps + for error in ordered_errors: + self.context.traps[error] = 0 + + if DEBUG: print "--", self.context try: |