tests/xn/fixed_test.py

   1 import unittest
   2 from ion.n.fixed import *
   3 from ion.n.powers import *
   4 #intToExponent
   5
   6 class KnownValues(unittest.TestCase):
   7
   8     knownvalues = (
   9         #         value,              fval,          ival
  10         (   "65535/256",      255.99609375,          255),
  11         (    "65535/16",     4095.93750000,         4095),
  12         (     "65535/4",    16383.75000000,        16383),
  13         (     "65535/2",    32767.50000000,        32767)
  14     )
  15
  16     def testFloat(self):
  17         "convert to float"
  18         for value,fval,ival in self.knownvalues:
  19             result = float(fixed(value))
  20             self.assertAlmostEqual(result, fval, 2)
  21
  22     def testInt(self):
  23         "convert to integer"
  24         for value, fval, ival in self.knownvalues:
  25             result = int(fixed(value))
  26             self.assertEqual(result, ival, 2)
  27
  28     def testUnFloat(self):
  29         "convert from float"
  30         for value, fval, ival in self.knownvalues:
  31             #extract the scale from the value string
  32             bits = value.find("/")
  33             bits = value[bits+1:]
  34             bits = int(bits)
  35             print bits,fval
  36             result = str(fixed(fval,intToExponent(bits)))
  37             self.assertEqual(result, value)
  38
  39     def testUnInt(self):
  40         "convert from int"
  41         for value, fval, ival in self.knownvalues:
  42             bits = value.find("/")
  43             bits = value[bits+1:]
  44             bits = int(bits)
  45             result = str(fixed(ival,intToExponent(bits)))
  46             self.assertEqual(result, "%s/%s" % (ival,bits) , 2)
  47
  48
  49 #class Arithmetic(unittest.TestCase):
  50 #    KnownValues = (
  51 #
  52 #    )
  53 #    def testMul(self):
  54    #testDiv
  55    #testExtendedSyntax
  56    #test
  57
  58 if __name__ == "__main__":
  59     unittest.main()