Tests for fpformat module
from test
.test_support
import run_unittest
from fpformat
import fix
, sci
, NotANumber
# 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
# Differences only occur for unreasonable n and d. <.2 wink>)
class FpformatTest(unittest
.TestCase
):
def checkFix(self
, n
, digits
):
if isinstance(n
, StringType
):
expected
= "%.*f" % (digits
, float(n
))
self
.assertEquals(result
, expected
)
def checkSci(self
, n
, digits
):
if isinstance(n
, StringType
):
expected
= "%.*e" % (digits
, float(n
))
# add the extra 0 if needed
num
, exp
= expected
.split("e")
exp
= exp
[0] + "0" + exp
[1:]
expected
= "%se%s" % (num
, exp
)
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 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
)
self
.fail("No exception on non-numeric sci")
run_unittest(FpformatTest
)
if __name__
== "__main__":