"""Unit test for roman.py

This program is part of "Dive Into Python", a free Python book for
experienced programmers.  Visit http://diveintopython.org/ for the
latest version.
"""

__author__ = "Mark Pilgrim (mark@diveintopython.org)"
__version__ = "$Revision: 1.2 $"
__date__ = "$Date: 2004/05/05 21:57:19 $"
__copyright__ = "Copyright (c) 2001 Mark Pilgrim"
__license__ = "Python"

import roman
from py import test


class TestKnownValues:

        
        known_values = ( (1, 'I'),
                         (2, 'II'),
                         (3, 'III'),
                         (4, 'IV'),
                         (5, 'V'),
                         (6, 'VI'),
                         (7, 'VII'),
                         (8, 'VIII'),
                         (9, 'IX'),
                         (10, 'X'),
                         (50, 'L'),
                         (100, 'C'),
                         (500, 'D'),
                         (1000, 'M'),
                         (31, 'XXXI'),
                         (148, 'CXLVIII'),
                         (294, 'CCXCIV'),
                         (312, 'CCCXII'),
                         (421, 'CDXXI'),
                         (528, 'DXXVIII'),
                         (621, 'DCXXI'),
                         (782, 'DCCLXXXII'),
                         (870, 'DCCCLXX'),
                         (941, 'CMXLI'),
                         (1043, 'MXLIII'),
                         (1110, 'MCX'),
                         (1226, 'MCCXXVI'),
                         (1301, 'MCCCI'),
                         (1485, 'MCDLXXXV'),
                         (1509, 'MDIX'),
                         (1607, 'MDCVII'),
                         (1754, 'MDCCLIV'),
                         (1832, 'MDCCCXXXII'),
                         (1993, 'MCMXCIII'),
                         (2074, 'MMLXXIV'),
                         (2152, 'MMCLII'),
                         (2212, 'MMCCXII'),
                         (2343, 'MMCCCXLIII'),
                         (2499, 'MMCDXCIX'),
                         (2574, 'MMDLXXIV'),
                         (2646, 'MMDCXLVI'),
                         (2723, 'MMDCCXXIII'),
                         (2892, 'MMDCCCXCII'),
                         (2975, 'MMCMLXXV'),
                         (3051, 'MMMLI'),
                         (3185, 'MMMCLXXXV'),
                         (3250, 'MMMCCL'),
                         (3313, 'MMMCCCXIII'),
                         (3408, 'MMMCDVIII'),
                         (3501, 'MMMDI'),
                         (3610, 'MMMDCX'),
                         (3743, 'MMMDCCXLIII'),
                         (3844, 'MMMDCCCXLIV'),
                         (3888, 'MMMDCCCLXXXVIII'),
                         (3940, 'MMMCMXL'),
                         (3999, 'MMMCMXCIX'),
                         (4000, 'MMMM'),
                         (4500, 'MMMMD'),
                         (4888, 'MMMMDCCCLXXXVIII'),
                         (4999, 'MMMMCMXCIX')) 
        
        def to_roman_known_values(self, integer, numeral):
                result = roman.toRoman(integer)
                assert numeral == result

        def from_roman_known_values(self, integer, numeral):
                result = roman.fromRoman(numeral)
                assert integer == result

        def test_to_roman_known_values(self):
                """toRoman should give known result with known input"""
                for integer, numeral in self.known_values:
                        yield self.to_roman_known_values, integer, numeral

        def test_from_roman_known_values(self):
                """fromRoman should give known result with known input"""
                for integer, numeral in self.known_values:
                        yield self.from_roman_known_values, integer, numeral


class TestToRomanBadInput:

        def out_of_range(self, integer):
                test.raises(roman.OutOfRangeError, roman.toRoman, integer)

        def test_out_of_range(self):
                """toRoman should fail:
                - with too large input
                - with 0 input
                - with negative input
                """
                for integer, msg in (5000, 0, -1):
                        print 'Fail on:', integer
                        yield self.out_of_range, integer

        def test_decimal(self):
                """toRoman should fail with non-integer input"""
                test.raises(roman.NotIntegerError, roman.toRoman, 0.5)


class TestFromRomanBadInput:

        def invalid_romam_numeral(self, s):
                test.raises(roman.InvalidRomanNumeralError, roman.fromRoman, s)
        
        def test_too_many_repeated_numerals(self):
                """fromRoman should fail with too many repeated numerals"""
                for s in ('MMMMM', 'DD', 'CCCC', 'LL', 'XXXX', 'VV', 'IIII'):
                        print 'Fail on:', s
                        yield self.invalid_romam_numeral, s

        def test_repeated_pairs(self):
                """fromRoman should fail with repeated pairs of numerals"""
                for s in ('CMCM', 'CDCD', 'XCXC', 'XLXL', 'IXIX', 'IVIV'):
                        print 'Fail on:', s
                        yield self.invalid_romam_numeral, s

        def test_malformed_antecedent(self):
                """fromRoman should fail with malformed antecedents"""
                for s in ('IIMXCC', 'VX', 'DCM', 'CMM', 'IXIV',
                                  'MCMC', 'XCX', 'IVI', 'LM', 'LD', 'LC'):
                        print 'Fail on:', s
                        yield self.invalid_romam_numeral, s

        def test_blank(self):
                """fromRoman should fail with blank string"""
                yield self.invalid_romam_numeral, ''
                

class TestSanityCheck:

        def sanity(self, integer):
                numeral = roman.toRoman(integer)
                result = roman.fromRoman(numeral)
                assert integer == result
        
        def test_sanity(self):
                """fromRoman(toRoman(n))==n for all n"""
                for integer in range(1, 5000):
                        print 'Fail on:', integer
                        yield self.sanity, integer
                        

class TestCaseCheck:

        def to_romam_up(self, integer):
                numeral = roman.toRoman(integer)
                assert numeral == numeral.upper()

        def from_romam_up(self, integer):
                numeral = roman.toRoman(integer)
                roman.fromRoman(numeral.upper())
                test.raises(roman.InvalidRomanNumeralError,
                            roman.fromRoman, numeral.lower())

        
        def test_to_roman_case(self):
                """toRoman should always return uppercase"""
                for integer in range(1, 5000):
                        print "Fail on:", integer
                        yield self.to_romam_up, integer

        def test_from_roman_case(self):
                """fromRoman should only accept uppercase input"""
                for integer in range(1, 5000):
                        print "Fail on:", integer
                        yield self.from_romam_up, integer