| 4710c53d |
1 | '''\r |
| 2 | Tests for fpformat module\r |
| 3 | Nick Mathewson\r |
| 4 | '''\r |
| 5 | from test.test_support import run_unittest, import_module\r |
| 6 | import unittest\r |
| 7 | fpformat = import_module('fpformat', deprecated=True)\r |
| 8 | fix, sci, NotANumber = fpformat.fix, fpformat.sci, fpformat.NotANumber\r |
| 9 | \r |
| 10 | StringType = type('')\r |
| 11 | \r |
| 12 | # Test the old and obsolescent fpformat module.\r |
| 13 | #\r |
| 14 | # (It's obsolescent because fix(n,d) == "%.*f"%(d,n) and\r |
| 15 | # sci(n,d) == "%.*e"%(d,n)\r |
| 16 | # for all reasonable numeric n and d, except that sci gives 3 exponent\r |
| 17 | # digits instead of 2.\r |
| 18 | #\r |
| 19 | # Differences only occur for unreasonable n and d. <.2 wink>)\r |
| 20 | \r |
| 21 | class FpformatTest(unittest.TestCase):\r |
| 22 | \r |
| 23 | def checkFix(self, n, digits):\r |
| 24 | result = fix(n, digits)\r |
| 25 | if isinstance(n, StringType):\r |
| 26 | n = repr(n)\r |
| 27 | expected = "%.*f" % (digits, float(n))\r |
| 28 | \r |
| 29 | self.assertEqual(result, expected)\r |
| 30 | \r |
| 31 | def checkSci(self, n, digits):\r |
| 32 | result = sci(n, digits)\r |
| 33 | if isinstance(n, StringType):\r |
| 34 | n = repr(n)\r |
| 35 | expected = "%.*e" % (digits, float(n))\r |
| 36 | # add the extra 0 if needed\r |
| 37 | num, exp = expected.split("e")\r |
| 38 | if len(exp) < 4:\r |
| 39 | exp = exp[0] + "0" + exp[1:]\r |
| 40 | expected = "%se%s" % (num, exp)\r |
| 41 | \r |
| 42 | self.assertEqual(result, expected)\r |
| 43 | \r |
| 44 | def test_basic_cases(self):\r |
| 45 | self.assertEqual(fix(100.0/3, 3), '33.333')\r |
| 46 | self.assertEqual(sci(100.0/3, 3), '3.333e+001')\r |
| 47 | \r |
| 48 | def test_reasonable_values(self):\r |
| 49 | for d in range(7):\r |
| 50 | for val in (1000.0/3, 1000, 1000.0, .002, 1.0/3, 1e10):\r |
| 51 | for realVal in (val, 1.0/val, -val, -1.0/val):\r |
| 52 | self.checkFix(realVal, d)\r |
| 53 | self.checkSci(realVal, d)\r |
| 54 | \r |
| 55 | def test_failing_values(self):\r |
| 56 | # Now for 'unreasonable n and d'\r |
| 57 | self.assertEqual(fix(1.0, 1000), '1.'+('0'*1000))\r |
| 58 | self.assertEqual(sci("1"+('0'*1000), 0), '1e+1000')\r |
| 59 | \r |
| 60 | # This behavior is inconsistent. sci raises an exception; fix doesn't.\r |
| 61 | yacht = "Throatwobbler Mangrove"\r |
| 62 | self.assertEqual(fix(yacht, 10), yacht)\r |
| 63 | try:\r |
| 64 | sci(yacht, 10)\r |
| 65 | except NotANumber:\r |
| 66 | pass\r |
| 67 | else:\r |
| 68 | self.fail("No exception on non-numeric sci")\r |
| 69 | \r |
| 70 | \r |
| 71 | def test_main():\r |
| 72 | run_unittest(FpformatTest)\r |
| 73 | \r |
| 74 | \r |
| 75 | if __name__ == "__main__":\r |
| 76 | test_main()\r |
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