''' | |
Tests for fpformat module | |
Nick Mathewson | |
''' | |
from test.test_support import run_unittest, import_module | |
import unittest | |
fpformat = import_module('fpformat', deprecated=True) | |
fix, sci, NotANumber = fpformat.fix, fpformat.sci, fpformat.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.assertEqual(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 if needed | |
num, exp = expected.split("e") | |
if len(exp) < 4: | |
exp = exp[0] + "0" + exp[1:] | |
expected = "%se%s" % (num, exp) | |
self.assertEqual(result, expected) | |
def test_basic_cases(self): | |
self.assertEqual(fix(100.0/3, 3), '33.333') | |
self.assertEqual(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.assertEqual(fix(1.0, 1000), '1.'+('0'*1000)) | |
self.assertEqual(sci("1"+('0'*1000), 0), '1e+1000') | |
# This behavior is inconsistent. sci raises an exception; fix doesn't. | |
yacht = "Throatwobbler Mangrove" | |
self.assertEqual(fix(yacht, 10), yacht) | |
try: | |
sci(yacht, 10) | |
except NotANumber: | |
pass | |
else: | |
self.fail("No exception on non-numeric sci") | |
def test_main(): | |
run_unittest(FpformatTest) | |
if __name__ == "__main__": | |
test_main() |