[Python-checkins] CVS: python/dist/src/Lib/test test_fpformat.py,NONE,1.1

2001年7月22日 19:46:37 -0700

Update of /cvsroot/python/python/dist/src/Lib/test
In directory usw-pr-cvs1:/tmp/cvs-serv12484/test
Added Files:
	test_fpformat.py 
Log Message:
New tests by Nick Mathewson, for the fpformat module.
This closes SF patch #440290.
--- NEW FILE: test_fpformat.py ---
'''
 Tests for fpformat module
 Nick Mathewson
'''
from test_support import run_unittest
import unittest
from fpformat import fix, sci, NotANumber
StringType = type('')
# Test the old and obsolescent fpformat module.
#
# (It's obsolescent because fix(n,d) == "%.*f"%(d,n) and 
# sci(n,d) == "%.*e"%(d,n)
# for all reasonable numeric n and d, except that sci gives 3 exponent 
# digits instead of 2. 
#
# Differences only occur for unreasonable n and d. <.2 wink>)
class FpformatTest(unittest.TestCase):
 def checkFix(self, n, digits):
 result = fix(n, digits)
 if isinstance(n, StringType):
 n = repr(n)
 expected = "%.*f" % (digits, float(n))
 self.assertEquals(result, expected)
 def checkSci(self, n, digits):
 result = sci(n, digits)
 if isinstance(n, StringType):
 n = repr(n)
 expected = "%.*e" % (digits, float(n))
 # add the extra 0
 expected = expected[:-2]+'0'+expected[-2:]
 self.assertEquals(result, expected)
 def test_basic_cases(self):
 self.assertEquals(fix(100.0/3, 3), '33.333')
 self.assertEquals(sci(100.0/3, 3), '3.333e+001')
 def test_reasonable_values(self):
 for d in range(7):
 for val in (1000.0/3, 1000, 1000.0, .002, 1.0/3, 1e10):
 for realVal in (val, 1.0/val, -val, -1.0/val):
 self.checkFix(realVal, d)
 self.checkSci(realVal, d)
 def test_failing_values(self):
 # Now for 'unreasonable n and d'
 self.assertEquals(fix(1.0, 1000), '1.'+('0'*1000))
 self.assertEquals(sci("1"+('0'*1000), 0), '1e+1000')
 # This behavior is inconsistent. sci raises an exception; fix doesn't.
 yacht = "Throatwobbler Mangrove"
 self.assertEquals(fix(yacht, 10), yacht)
 try:
 sci(yacht, 10)
 except NotANumber:
 pass
 else:
 self.fail("No exception on non-numeric sci")
run_unittest(FpformatTest)