Initial commit of OpenSPARC T2 architecture model.

[OpenSPARC-T2-SAM] / sam-t2 / devtools / amd64 / lib / python2.4 / test / test_csv.py

# -*- coding: iso-8859-1 -*-
# Copyright (C) 2001,2002 Python Software Foundation
# csv package unit tests

import sys
import os
import unittest
from StringIO import StringIO
import tempfile
import csv
import gc
from test import test_support

class Test_Csv(unittest.TestCase):
   """
   Test the underlying C csv parser in ways that are not appropriate
   from the high level interface. Further tests of this nature are done
   in TestDialectRegistry.
   """
   def test_reader_arg_valid(self):
       self.assertRaises(TypeError, csv.reader)
       self.assertRaises(TypeError, csv.reader, None)
       self.assertRaises(AttributeError, csv.reader, [], bad_attr = 0)
       self.assertRaises(csv.Error, csv.reader, [], 'foo')
       class BadClass:
           def __init__(self):
               raise IOError
       self.assertRaises(IOError, csv.reader, [], BadClass)
       self.assertRaises(TypeError, csv.reader, [], None)
       class BadDialect:
           bad_attr = 0
       self.assertRaises(AttributeError, csv.reader, [], BadDialect)

   def test_writer_arg_valid(self):
       self.assertRaises(TypeError, csv.writer)
       self.assertRaises(TypeError, csv.writer, None)
       self.assertRaises(AttributeError, csv.writer, StringIO(), bad_attr = 0)

   def _test_attrs(self, obj):
       self.assertEqual(obj.dialect.delimiter, ',')
       obj.dialect.delimiter = '\t'
       self.assertEqual(obj.dialect.delimiter, '\t')
       self.assertRaises(TypeError, delattr, obj.dialect, 'delimiter')
       self.assertRaises(TypeError, setattr, obj.dialect,
                         'lineterminator', None)
       obj.dialect.escapechar = None
       self.assertEqual(obj.dialect.escapechar, None)
       self.assertRaises(TypeError, delattr, obj.dialect, 'quoting')
       self.assertRaises(TypeError, setattr, obj.dialect, 'quoting', None)
       obj.dialect.quoting = csv.QUOTE_MINIMAL
       self.assertEqual(obj.dialect.quoting, csv.QUOTE_MINIMAL)

   def test_reader_attrs(self):
       self._test_attrs(csv.reader([]))

   def test_writer_attrs(self):
       self._test_attrs(csv.writer(StringIO()))

   def _write_test(self, fields, expect, **kwargs):
       fd, name = tempfile.mkstemp()
       fileobj = os.fdopen(fd, "w+b")
       try:
           writer = csv.writer(fileobj, **kwargs)
           writer.writerow(fields)
           fileobj.seek(0)
           self.assertEqual(fileobj.read(),
                            expect + writer.dialect.lineterminator)
       finally:
           fileobj.close()
           os.unlink(name)

   def test_write_arg_valid(self):
       self.assertRaises(csv.Error, self._write_test, None, '')
       self._write_test((), '')
       self._write_test([None], '""')
       self.assertRaises(csv.Error, self._write_test,
                         [None], None, quoting = csv.QUOTE_NONE)
       # Check that exceptions are passed up the chain
       class BadList:
           def __len__(self):
               return 10;
           def __getitem__(self, i):
               if i > 2:
                   raise IOError
       self.assertRaises(IOError, self._write_test, BadList(), '')
       class BadItem:
           def __str__(self):
               raise IOError
       self.assertRaises(IOError, self._write_test, [BadItem()], '')

   def test_write_bigfield(self):
       # This exercises the buffer realloc functionality
       bigstring = 'X' * 50000
       self._write_test([bigstring,bigstring], '%s,%s' % \
                        (bigstring, bigstring))

   def test_write_quoting(self):
       self._write_test(['a','1','p,q'], 'a,1,"p,q"')
       self.assertRaises(csv.Error,
                         self._write_test,
                         ['a','1','p,q'], 'a,1,"p,q"',
                         quoting = csv.QUOTE_NONE)
       self._write_test(['a','1','p,q'], 'a,1,"p,q"',
                        quoting = csv.QUOTE_MINIMAL)
       self._write_test(['a','1','p,q'], '"a",1,"p,q"',
                        quoting = csv.QUOTE_NONNUMERIC)
       self._write_test(['a','1','p,q'], '"a","1","p,q"',
                        quoting = csv.QUOTE_ALL)

   def test_write_escape(self):
       self._write_test(['a','1','p,q'], 'a,1,"p,q"',
                        escapechar='\\')
# FAILED - needs to be fixed [am]:
#        self._write_test(['a','1','p,"q"'], 'a,1,"p,\\"q\\"',
#                         escapechar='\\', doublequote = 0)
       self._write_test(['a','1','p,q'], 'a,1,p\\,q',
                        escapechar='\\', quoting = csv.QUOTE_NONE)

   def test_writerows(self):
       class BrokenFile:
           def write(self, buf):
               raise IOError
       writer = csv.writer(BrokenFile())
       self.assertRaises(IOError, writer.writerows, [['a']])
       fd, name = tempfile.mkstemp()
       fileobj = os.fdopen(fd, "w+b")
       try:
           writer = csv.writer(fileobj)
           self.assertRaises(TypeError, writer.writerows, None)
           writer.writerows([['a','b'],['c','d']])
           fileobj.seek(0)
           self.assertEqual(fileobj.read(), "a,b\r\nc,d\r\n")
       finally:
           fileobj.close()
           os.unlink(name)

   def _read_test(self, input, expect, **kwargs):
       reader = csv.reader(input, **kwargs)
       result = list(reader)
       self.assertEqual(result, expect)

   def test_read_oddinputs(self):
       self._read_test([], [])
       self._read_test([''], [[]])
       self.assertRaises(csv.Error, self._read_test,
                         ['"ab"c'], None, strict = 1)
       # cannot handle null bytes for the moment
       self.assertRaises(csv.Error, self._read_test,
                         ['ab\0c'], None, strict = 1)
       self._read_test(['"ab"c'], [['abc']], doublequote = 0)

   def test_read_eol(self):
       self._read_test(['a,b'], [['a','b']])
       self._read_test(['a,b\n'], [['a','b']])
       self._read_test(['a,b\r\n'], [['a','b']])
       self._read_test(['a,b\r'], [['a','b']])
       self.assertRaises(csv.Error, self._read_test, ['a,b\rc,d'], [])
       self.assertRaises(csv.Error, self._read_test, ['a,b\nc,d'], [])
       self.assertRaises(csv.Error, self._read_test, ['a,b\r\nc,d'], [])

   def test_read_escape(self):
       self._read_test(['a,\\b,c'], [['a', '\\b', 'c']], escapechar='\\')
       self._read_test(['a,b\\,c'], [['a', 'b,c']], escapechar='\\')
       self._read_test(['a,"b\\,c"'], [['a', 'b,c']], escapechar='\\')
       self._read_test(['a,"b,\\c"'], [['a', 'b,\\c']], escapechar='\\')
       self._read_test(['a,"b,c\\""'], [['a', 'b,c"']], escapechar='\\')
       self._read_test(['a,"b,c"\\'], [['a', 'b,c\\']], escapechar='\\')

   def test_read_bigfield(self):
       # This exercises the buffer realloc functionality
       bigstring = 'X' * 50000
       bigline = '%s,%s' % (bigstring, bigstring)
       self._read_test([bigline], [[bigstring, bigstring]])

class TestDialectRegistry(unittest.TestCase):
   def test_registry_badargs(self):
       self.assertRaises(TypeError, csv.list_dialects, None)
       self.assertRaises(TypeError, csv.get_dialect)
       self.assertRaises(csv.Error, csv.get_dialect, None)
       self.assertRaises(csv.Error, csv.get_dialect, "nonesuch")
       self.assertRaises(TypeError, csv.unregister_dialect)
       self.assertRaises(csv.Error, csv.unregister_dialect, None)
       self.assertRaises(csv.Error, csv.unregister_dialect, "nonesuch")
       self.assertRaises(TypeError, csv.register_dialect, None)
       self.assertRaises(TypeError, csv.register_dialect, None, None)
       self.assertRaises(TypeError, csv.register_dialect, "nonesuch", None)
       class bogus:
           def __init__(self):
               raise KeyError
       self.assertRaises(KeyError, csv.register_dialect, "nonesuch", bogus)

   def test_registry(self):
       class myexceltsv(csv.excel):
           delimiter = "\t"
       name = "myexceltsv"
       expected_dialects = csv.list_dialects() + [name]
       expected_dialects.sort()
       csv.register_dialect(name, myexceltsv)
       try:
           self.failUnless(isinstance(csv.get_dialect(name), myexceltsv))
           got_dialects = csv.list_dialects()
           got_dialects.sort()
           self.assertEqual(expected_dialects, got_dialects)
       finally:
           csv.unregister_dialect(name)

   def test_incomplete_dialect(self):
       class myexceltsv(csv.Dialect):
           delimiter = "\t"
       self.assertRaises(csv.Error, myexceltsv)

   def test_space_dialect(self):
       class space(csv.excel):
           delimiter = " "
           quoting = csv.QUOTE_NONE
           escapechar = "\\"

       fd, name = tempfile.mkstemp()
       fileobj = os.fdopen(fd, "w+b")
       try:
           fileobj.write("abc def\nc1ccccc1 benzene\n")
           fileobj.seek(0)
           rdr = csv.reader(fileobj, dialect=space())
           self.assertEqual(rdr.next(), ["abc", "def"])
           self.assertEqual(rdr.next(), ["c1ccccc1", "benzene"])
       finally:
           fileobj.close()
           os.unlink(name)

   def test_dialect_apply(self):
       class testA(csv.excel):
           delimiter = "\t"
       class testB(csv.excel):
           delimiter = ":"
       class testC(csv.excel):
           delimiter = "|"

       csv.register_dialect('testC', testC)
       try:
           fd, name = tempfile.mkstemp()
           fileobj = os.fdopen(fd, "w+b")
           try:
               writer = csv.writer(fileobj)
               writer.writerow([1,2,3])
               fileobj.seek(0)
               self.assertEqual(fileobj.read(), "1,2,3\r\n")
           finally:
               fileobj.close()
               os.unlink(name)

           fd, name = tempfile.mkstemp()
           fileobj = os.fdopen(fd, "w+b")
           try:
               writer = csv.writer(fileobj, testA)
               writer.writerow([1,2,3])
               fileobj.seek(0)
               self.assertEqual(fileobj.read(), "1\t2\t3\r\n")
           finally:
               fileobj.close()
               os.unlink(name)

           fd, name = tempfile.mkstemp()
           fileobj = os.fdopen(fd, "w+b")
           try:
               writer = csv.writer(fileobj, dialect=testB())
               writer.writerow([1,2,3])
               fileobj.seek(0)
               self.assertEqual(fileobj.read(), "1:2:3\r\n")
           finally:
               fileobj.close()
               os.unlink(name)

           fd, name = tempfile.mkstemp()
           fileobj = os.fdopen(fd, "w+b")
           try:
               writer = csv.writer(fileobj, dialect='testC')
               writer.writerow([1,2,3])
               fileobj.seek(0)
               self.assertEqual(fileobj.read(), "1|2|3\r\n")
           finally:
               fileobj.close()
               os.unlink(name)

           fd, name = tempfile.mkstemp()
           fileobj = os.fdopen(fd, "w+b")
           try:
               writer = csv.writer(fileobj, dialect=testA, delimiter=';')
               writer.writerow([1,2,3])
               fileobj.seek(0)
               self.assertEqual(fileobj.read(), "1;2;3\r\n")
           finally:
               fileobj.close()
               os.unlink(name)

       finally:
           csv.unregister_dialect('testC')

   def test_bad_dialect(self):
       # Unknown parameter
       self.assertRaises(AttributeError, csv.reader, [], bad_attr = 0)
       # Bad values
       self.assertRaises(TypeError, csv.reader, [], delimiter = None)
       self.assertRaises(TypeError, csv.reader, [], quoting = -1)
       self.assertRaises(TypeError, csv.reader, [], quoting = 100)

class TestCsvBase(unittest.TestCase):
   def readerAssertEqual(self, input, expected_result):
       fd, name = tempfile.mkstemp()
       fileobj = os.fdopen(fd, "w+b")
       try:
           fileobj.write(input)
           fileobj.seek(0)
           reader = csv.reader(fileobj, dialect = self.dialect)
           fields = list(reader)
           self.assertEqual(fields, expected_result)
       finally:
           fileobj.close()
           os.unlink(name)

   def writerAssertEqual(self, input, expected_result):
       fd, name = tempfile.mkstemp()
       fileobj = os.fdopen(fd, "w+b")
       try:
           writer = csv.writer(fileobj, dialect = self.dialect)
           writer.writerows(input)
           fileobj.seek(0)
           self.assertEqual(fileobj.read(), expected_result)
       finally:
           fileobj.close()
           os.unlink(name)

class TestDialectExcel(TestCsvBase):
   dialect = 'excel'

   def test_single(self):
       self.readerAssertEqual('abc', [['abc']])

   def test_simple(self):
       self.readerAssertEqual('1,2,3,4,5', [['1','2','3','4','5']])

   def test_blankline(self):
       self.readerAssertEqual('', [])

   def test_empty_fields(self):
       self.readerAssertEqual(',', [['', '']])

   def test_singlequoted(self):
       self.readerAssertEqual('""', [['']])

   def test_singlequoted_left_empty(self):
       self.readerAssertEqual('"",', [['','']])

   def test_singlequoted_right_empty(self):
       self.readerAssertEqual(',""', [['','']])

   def test_single_quoted_quote(self):
       self.readerAssertEqual('""""', [['"']])

   def test_quoted_quotes(self):
       self.readerAssertEqual('""""""', [['""']])

   def test_inline_quote(self):
       self.readerAssertEqual('a""b', [['a""b']])

   def test_inline_quotes(self):
       self.readerAssertEqual('a"b"c', [['a"b"c']])

   def test_quotes_and_more(self):
       self.readerAssertEqual('"a"b', [['ab']])

   def test_lone_quote(self):
       self.readerAssertEqual('a"b', [['a"b']])

   def test_quote_and_quote(self):
       self.readerAssertEqual('"a" "b"', [['a "b"']])

   def test_space_and_quote(self):
       self.readerAssertEqual(' "a"', [[' "a"']])

   def test_quoted(self):
       self.readerAssertEqual('1,2,3,"I think, therefore I am",5,6',
                              [['1', '2', '3',
                                'I think, therefore I am',
                                '5', '6']])

   def test_quoted_quote(self):
       self.readerAssertEqual('1,2,3,"""I see,"" said the blind man","as he picked up his hammer and saw"',
                              [['1', '2', '3',
                                '"I see," said the blind man',
                                'as he picked up his hammer and saw']])

   def test_quoted_nl(self):
       input = '''\
1,2,3,"""I see,""
said the blind man","as he picked up his
hammer and saw"
9,8,7,6'''
       self.readerAssertEqual(input,
                              [['1', '2', '3',
                                  '"I see,"\nsaid the blind man',
                                  'as he picked up his\nhammer and saw'],
                               ['9','8','7','6']])

   def test_dubious_quote(self):
       self.readerAssertEqual('12,12,1",', [['12', '12', '1"', '']])

   def test_null(self):
       self.writerAssertEqual([], '')

   def test_single(self):
       self.writerAssertEqual([['abc']], 'abc\r\n')

   def test_simple(self):
       self.writerAssertEqual([[1, 2, 'abc', 3, 4]], '1,2,abc,3,4\r\n')

   def test_quotes(self):
       self.writerAssertEqual([[1, 2, 'a"bc"', 3, 4]], '1,2,"a""bc""",3,4\r\n')

   def test_quote_fieldsep(self):
       self.writerAssertEqual([['abc,def']], '"abc,def"\r\n')

   def test_newlines(self):
       self.writerAssertEqual([[1, 2, 'a\nbc', 3, 4]], '1,2,"a\nbc",3,4\r\n')

class EscapedExcel(csv.excel):
   quoting = csv.QUOTE_NONE
   escapechar = '\\'

class TestEscapedExcel(TestCsvBase):
   dialect = EscapedExcel()

   def test_escape_fieldsep(self):
       self.writerAssertEqual([['abc,def']], 'abc\\,def\r\n')

   def test_read_escape_fieldsep(self):
       self.readerAssertEqual('abc\\,def\r\n', [['abc,def']])

class QuotedEscapedExcel(csv.excel):
   quoting = csv.QUOTE_NONNUMERIC
   escapechar = '\\'

class TestQuotedEscapedExcel(TestCsvBase):
   dialect = QuotedEscapedExcel()

   def test_write_escape_fieldsep(self):
       self.writerAssertEqual([['abc,def']], '"abc,def"\r\n')

   def test_read_escape_fieldsep(self):
       self.readerAssertEqual('"abc\\,def"\r\n', [['abc,def']])

class TestDictFields(unittest.TestCase):
   ### "long" means the row is longer than the number of fieldnames
   ### "short" means there are fewer elements in the row than fieldnames
   def test_write_simple_dict(self):
       fd, name = tempfile.mkstemp()
       fileobj = os.fdopen(fd, "w+b")
       try:
           writer = csv.DictWriter(fileobj, fieldnames = ["f1", "f2", "f3"])
           writer.writerow({"f1": 10, "f3": "abc"})
           fileobj.seek(0)
           self.assertEqual(fileobj.read(), "10,,abc\r\n")
       finally:
           fileobj.close()
           os.unlink(name)

   def test_write_no_fields(self):
       fileobj = StringIO()
       self.assertRaises(TypeError, csv.DictWriter, fileobj)

   def test_read_dict_fields(self):
       fd, name = tempfile.mkstemp()
       fileobj = os.fdopen(fd, "w+b")
       try:
           fileobj.write("1,2,abc\r\n")
           fileobj.seek(0)
           reader = csv.DictReader(fileobj,
                                   fieldnames=["f1", "f2", "f3"])
           self.assertEqual(reader.next(), {"f1": '1', "f2": '2', "f3": 'abc'})
       finally:
           fileobj.close()
           os.unlink(name)

   def test_read_dict_no_fieldnames(self):
       fd, name = tempfile.mkstemp()
       fileobj = os.fdopen(fd, "w+b")
       try:
           fileobj.write("f1,f2,f3\r\n1,2,abc\r\n")
           fileobj.seek(0)
           reader = csv.DictReader(fileobj)
           self.assertEqual(reader.next(), {"f1": '1', "f2": '2', "f3": 'abc'})
       finally:
           fileobj.close()
           os.unlink(name)

   def test_read_long(self):
       fd, name = tempfile.mkstemp()
       fileobj = os.fdopen(fd, "w+b")
       try:
           fileobj.write("1,2,abc,4,5,6\r\n")
           fileobj.seek(0)
           reader = csv.DictReader(fileobj,
                                   fieldnames=["f1", "f2"])
           self.assertEqual(reader.next(), {"f1": '1', "f2": '2',
                                            None: ["abc", "4", "5", "6"]})
       finally:
           fileobj.close()
           os.unlink(name)

   def test_read_long_with_rest(self):
       fd, name = tempfile.mkstemp()
       fileobj = os.fdopen(fd, "w+b")
       try:
           fileobj.write("1,2,abc,4,5,6\r\n")
           fileobj.seek(0)
           reader = csv.DictReader(fileobj,
                                   fieldnames=["f1", "f2"], restkey="_rest")
           self.assertEqual(reader.next(), {"f1": '1', "f2": '2',
                                            "_rest": ["abc", "4", "5", "6"]})
       finally:
           fileobj.close()
           os.unlink(name)

   def test_read_long_with_rest_no_fieldnames(self):
       fd, name = tempfile.mkstemp()
       fileobj = os.fdopen(fd, "w+b")
       try:
           fileobj.write("f1,f2\r\n1,2,abc,4,5,6\r\n")
           fileobj.seek(0)
           reader = csv.DictReader(fileobj, restkey="_rest")
           self.assertEqual(reader.next(), {"f1": '1', "f2": '2',
                                            "_rest": ["abc", "4", "5", "6"]})
       finally:
           fileobj.close()
           os.unlink(name)

   def test_read_short(self):
       fd, name = tempfile.mkstemp()
       fileobj = os.fdopen(fd, "w+b")
       try:
           fileobj.write("1,2,abc,4,5,6\r\n1,2,abc\r\n")
           fileobj.seek(0)
           reader = csv.DictReader(fileobj,
                                   fieldnames="1 2 3 4 5 6".split(),
                                   restval="DEFAULT")
           self.assertEqual(reader.next(), {"1": '1', "2": '2', "3": 'abc',
                                            "4": '4', "5": '5', "6": '6'})
           self.assertEqual(reader.next(), {"1": '1', "2": '2', "3": 'abc',
                                            "4": 'DEFAULT', "5": 'DEFAULT',
                                            "6": 'DEFAULT'})
       finally:
           fileobj.close()
           os.unlink(name)

   def test_read_multi(self):
       sample = [
           '2147483648,43.0e12,17,abc,def\r\n',
           '147483648,43.0e2,17,abc,def\r\n',
           '47483648,43.0,170,abc,def\r\n'
           ]

       reader = csv.DictReader(sample,
                               fieldnames="i1 float i2 s1 s2".split())
       self.assertEqual(reader.next(), {"i1": '2147483648',
                                        "float": '43.0e12',
                                        "i2": '17',
                                        "s1": 'abc',
                                        "s2": 'def'})

   def test_read_with_blanks(self):
       reader = csv.DictReader(["1,2,abc,4,5,6\r\n","\r\n",
                                "1,2,abc,4,5,6\r\n"],
                               fieldnames="1 2 3 4 5 6".split())
       self.assertEqual(reader.next(), {"1": '1', "2": '2', "3": 'abc',
                                        "4": '4', "5": '5', "6": '6'})
       self.assertEqual(reader.next(), {"1": '1', "2": '2', "3": 'abc',
                                        "4": '4', "5": '5', "6": '6'})

   def test_read_semi_sep(self):
       reader = csv.DictReader(["1;2;abc;4;5;6\r\n"],
                               fieldnames="1 2 3 4 5 6".split(),
                               delimiter=';')
       self.assertEqual(reader.next(), {"1": '1', "2": '2', "3": 'abc',
                                        "4": '4', "5": '5', "6": '6'})

class TestArrayWrites(unittest.TestCase):
   def test_int_write(self):
       import array
       contents = [(20-i) for i in range(20)]
       a = array.array('i', contents)

       fd, name = tempfile.mkstemp()
       fileobj = os.fdopen(fd, "w+b")
       try:
           writer = csv.writer(fileobj, dialect="excel")
           writer.writerow(a)
           expected = ",".join([str(i) for i in a])+"\r\n"
           fileobj.seek(0)
           self.assertEqual(fileobj.read(), expected)
       finally:
           fileobj.close()
           os.unlink(name)

   def test_double_write(self):
       import array
       contents = [(20-i)*0.1 for i in range(20)]
       a = array.array('d', contents)
       fd, name = tempfile.mkstemp()
       fileobj = os.fdopen(fd, "w+b")
       try:
           writer = csv.writer(fileobj, dialect="excel")
           writer.writerow(a)
           expected = ",".join([str(i) for i in a])+"\r\n"
           fileobj.seek(0)
           self.assertEqual(fileobj.read(), expected)
       finally:
           fileobj.close()
           os.unlink(name)

   def test_float_write(self):
       import array
       contents = [(20-i)*0.1 for i in range(20)]
       a = array.array('f', contents)
       fd, name = tempfile.mkstemp()
       fileobj = os.fdopen(fd, "w+b")
       try:
           writer = csv.writer(fileobj, dialect="excel")
           writer.writerow(a)
           expected = ",".join([str(i) for i in a])+"\r\n"
           fileobj.seek(0)
           self.assertEqual(fileobj.read(), expected)
       finally:
           fileobj.close()
           os.unlink(name)

   def test_char_write(self):
       import array, string
       a = array.array('c', string.letters)
       fd, name = tempfile.mkstemp()
       fileobj = os.fdopen(fd, "w+b")
       try:
           writer = csv.writer(fileobj, dialect="excel")
           writer.writerow(a)
           expected = ",".join(a)+"\r\n"
           fileobj.seek(0)
           self.assertEqual(fileobj.read(), expected)
       finally:
           fileobj.close()
           os.unlink(name)

class TestDialectValidity(unittest.TestCase):
   def test_quoting(self):
       class mydialect(csv.Dialect):
           delimiter = ";"
           escapechar = '\\'
           doublequote = False
           skipinitialspace = True
           lineterminator = '\r\n'
           quoting = csv.QUOTE_NONE
       d = mydialect()

       mydialect.quoting = None
       self.assertRaises(csv.Error, mydialect)

       mydialect.quoting = csv.QUOTE_NONE
       mydialect.escapechar = None
       self.assertRaises(csv.Error, mydialect)

       mydialect.doublequote = True
       mydialect.quoting = csv.QUOTE_ALL
       mydialect.quotechar = '"'
       d = mydialect()

       mydialect.quotechar = "''"
       self.assertRaises(csv.Error, mydialect)

       mydialect.quotechar = 4
       self.assertRaises(csv.Error, mydialect)

   def test_delimiter(self):
       class mydialect(csv.Dialect):
           delimiter = ";"
           escapechar = '\\'
           doublequote = False
           skipinitialspace = True
           lineterminator = '\r\n'
           quoting = csv.QUOTE_NONE
       d = mydialect()

       mydialect.delimiter = ":::"
       self.assertRaises(csv.Error, mydialect)

       mydialect.delimiter = 4
       self.assertRaises(csv.Error, mydialect)

   def test_lineterminator(self):
       class mydialect(csv.Dialect):
           delimiter = ";"
           escapechar = '\\'
           doublequote = False
           skipinitialspace = True
           lineterminator = '\r\n'
           quoting = csv.QUOTE_NONE
       d = mydialect()

       mydialect.lineterminator = ":::"
       d = mydialect()

       mydialect.lineterminator = 4
       self.assertRaises(csv.Error, mydialect)


class TestSniffer(unittest.TestCase):
   sample1 = """\
Harry's, Arlington Heights, IL, 2/1/03, Kimi Hayes
Shark City, Glendale Heights, IL, 12/28/02, Prezence
Tommy's Place, Blue Island, IL, 12/28/02, Blue Sunday/White Crow
Stonecutters Seafood and Chop House, Lemont, IL, 12/19/02, Week Back
"""
   sample2 = """\
'Harry''s':'Arlington Heights':'IL':'2/1/03':'Kimi Hayes'
'Shark City':'Glendale Heights':'IL':'12/28/02':'Prezence'
'Tommy''s Place':'Blue Island':'IL':'12/28/02':'Blue Sunday/White Crow'
'Stonecutters Seafood and Chop House':'Lemont':'IL':'12/19/02':'Week Back'
"""

   header = '''\
"venue","city","state","date","performers"
'''
   sample3 = '''\
05/05/03?05/05/03?05/05/03?05/05/03?05/05/03?05/05/03
05/05/03?05/05/03?05/05/03?05/05/03?05/05/03?05/05/03
05/05/03?05/05/03?05/05/03?05/05/03?05/05/03?05/05/03
'''

   sample4 = '''\
2147483648;43.0e12;17;abc;def
147483648;43.0e2;17;abc;def
47483648;43.0;170;abc;def
'''

   def test_has_header(self):
       sniffer = csv.Sniffer()
       self.assertEqual(sniffer.has_header(self.sample1), False)
       self.assertEqual(sniffer.has_header(self.header+self.sample1), True)

   def test_sniff(self):
       sniffer = csv.Sniffer()
       dialect = sniffer.sniff(self.sample1)
       self.assertEqual(dialect.delimiter, ",")
       self.assertEqual(dialect.quotechar, '"')
       self.assertEqual(dialect.skipinitialspace, True)

       dialect = sniffer.sniff(self.sample2)
       self.assertEqual(dialect.delimiter, ":")
       self.assertEqual(dialect.quotechar, "'")
       self.assertEqual(dialect.skipinitialspace, False)

   def test_delimiters(self):
       sniffer = csv.Sniffer()
       dialect = sniffer.sniff(self.sample3)
       self.assertEqual(dialect.delimiter, "0")
       dialect = sniffer.sniff(self.sample3, delimiters="?,")
       self.assertEqual(dialect.delimiter, "?")
       dialect = sniffer.sniff(self.sample3, delimiters="/,")
       self.assertEqual(dialect.delimiter, "/")
       dialect = sniffer.sniff(self.sample4)
       self.assertEqual(dialect.delimiter, ";")

if not hasattr(sys, "gettotalrefcount"):
   if test_support.verbose: print "*** skipping leakage tests ***"
else:
   class NUL:
       def write(s, *args):
           pass
       writelines = write

   class TestLeaks(unittest.TestCase):
       def test_create_read(self):
           delta = 0
           lastrc = sys.gettotalrefcount()
           for i in xrange(20):
               gc.collect()
               self.assertEqual(gc.garbage, [])
               rc = sys.gettotalrefcount()
               csv.reader(["a,b,c\r\n"])
               csv.reader(["a,b,c\r\n"])
               csv.reader(["a,b,c\r\n"])
               delta = rc-lastrc
               lastrc = rc
           # if csv.reader() leaks, last delta should be 3 or more
           self.assertEqual(delta < 3, True)

       def test_create_write(self):
           delta = 0
           lastrc = sys.gettotalrefcount()
           s = NUL()
           for i in xrange(20):
               gc.collect()
               self.assertEqual(gc.garbage, [])
               rc = sys.gettotalrefcount()
               csv.writer(s)
               csv.writer(s)
               csv.writer(s)
               delta = rc-lastrc
               lastrc = rc
           # if csv.writer() leaks, last delta should be 3 or more
           self.assertEqual(delta < 3, True)

       def test_read(self):
           delta = 0
           rows = ["a,b,c\r\n"]*5
           lastrc = sys.gettotalrefcount()
           for i in xrange(20):
               gc.collect()
               self.assertEqual(gc.garbage, [])
               rc = sys.gettotalrefcount()
               rdr = csv.reader(rows)
               for row in rdr:
                   pass
               delta = rc-lastrc
               lastrc = rc
           # if reader leaks during read, delta should be 5 or more
           self.assertEqual(delta < 5, True)

       def test_write(self):
           delta = 0
           rows = [[1,2,3]]*5
           s = NUL()
           lastrc = sys.gettotalrefcount()
           for i in xrange(20):
               gc.collect()
               self.assertEqual(gc.garbage, [])
               rc = sys.gettotalrefcount()
               writer = csv.writer(s)
               for row in rows:
                   writer.writerow(row)
               delta = rc-lastrc
               lastrc = rc
           # if writer leaks during write, last delta should be 5 or more
           self.assertEqual(delta < 5, True)

# commented out for now - csv module doesn't yet support Unicode
## class TestUnicode(unittest.TestCase):
##     def test_unicode_read(self):
##         import codecs
##         f = codecs.EncodedFile(StringIO("Martin von Löwis,"
##                                         "Marc André Lemburg,"
##                                         "Guido van Rossum,"
##                                         "François Pinard\r\n"),
##                                data_encoding='iso-8859-1')
##         reader = csv.reader(f)
##         self.assertEqual(list(reader), [[u"Martin von Löwis",
##                                          u"Marc André Lemburg",
##                                          u"Guido van Rossum",
##                                          u"François Pinardn"]])

def test_main():
   mod = sys.modules[__name__]
   test_support.run_unittest(
       *[getattr(mod, name) for name in dir(mod) if name.startswith('Test')]
   )

if __name__ == '__main__':
   test_main()