Synnefo » snf-ganeti

#!/usr/bin/python

#

# Copyright (C) 2011 Google Inc.

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful, but

# WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

# General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

# 02110-1301, USA.

"""Script for testing ganeti.utils.text"""

import re

import string

import time

import unittest

import os

from cStringIO import StringIO

from ganeti import constants

from ganeti import utils

from ganeti import errors

import testutils

class TestMatchNameComponent(unittest.TestCase):

  """Test case for the MatchNameComponent function"""

  def testEmptyList(self):

    """Test that there is no match against an empty list"""

    self.failUnlessEqual(utils.MatchNameComponent("", []), None)

    self.failUnlessEqual(utils.MatchNameComponent("test", []), None)

  def testSingleMatch(self):

    """Test that a single match is performed correctly"""

    mlist = ["test1.example.com", "test2.example.com", "test3.example.com"]

    for key in "test2", "test2.example", "test2.example.com":

      self.failUnlessEqual(utils.MatchNameComponent(key, mlist), mlist[1])

  def testMultipleMatches(self):

    """Test that a multiple match is returned as None"""

    mlist = ["test1.example.com", "test1.example.org", "test1.example.net"]

    for key in "test1", "test1.example":

      self.failUnlessEqual(utils.MatchNameComponent(key, mlist), None)

  def testFullMatch(self):

    """Test that a full match is returned correctly"""

    key1 = "test1"

    key2 = "test1.example"

    mlist = [key2, key2 + ".com"]

    self.failUnlessEqual(utils.MatchNameComponent(key1, mlist), None)

    self.failUnlessEqual(utils.MatchNameComponent(key2, mlist), key2)

  def testCaseInsensitivePartialMatch(self):

    """Test for the case_insensitive keyword"""

    mlist = ["test1.example.com", "test2.example.net"]

    self.assertEqual(utils.MatchNameComponent("test2", mlist,

                                              case_sensitive=False),

                     "test2.example.net")

    self.assertEqual(utils.MatchNameComponent("Test2", mlist,

                                              case_sensitive=False),

                     "test2.example.net")

    self.assertEqual(utils.MatchNameComponent("teSt2", mlist,

                                              case_sensitive=False),

                     "test2.example.net")

    self.assertEqual(utils.MatchNameComponent("TeSt2", mlist,

                                              case_sensitive=False),

                     "test2.example.net")

  def testCaseInsensitiveFullMatch(self):

    mlist = ["ts1.ex", "ts1.ex.org", "ts2.ex", "Ts2.ex"]

    # Between the two ts1 a full string match non-case insensitive should work

    self.assertEqual(utils.MatchNameComponent("Ts1", mlist,

                                              case_sensitive=False),

                     None)

    self.assertEqual(utils.MatchNameComponent("Ts1.ex", mlist,

                                              case_sensitive=False),

                     "ts1.ex")

    self.assertEqual(utils.MatchNameComponent("ts1.ex", mlist,

                                              case_sensitive=False),

                     "ts1.ex")

    # Between the two ts2 only case differs, so only case-match works

    self.assertEqual(utils.MatchNameComponent("ts2.ex", mlist,

                                              case_sensitive=False),

                     "ts2.ex")

    self.assertEqual(utils.MatchNameComponent("Ts2.ex", mlist,

                                              case_sensitive=False),

                     "Ts2.ex")

    self.assertEqual(utils.MatchNameComponent("TS2.ex", mlist,

                                              case_sensitive=False),

                     None)

class TestDnsNameGlobPattern(unittest.TestCase):

  def setUp(self):

    self.names = [

      "node1.example.com",

      "node2-0.example.com",

      "node2-1.example.com",

      "node1.example.net",

      "web1.example.com",

      "web2.example.com",

      "sub.site.example.com",

      ]

  def _Test(self, pattern):

    re_pat = utils.DnsNameGlobPattern(pattern)

    return filter(re.compile(re_pat).match, self.names)

  def test(self):

    for pattern in ["xyz", "node", " ", "example.net", "x*.example.*",

                    "x*.example.com"]:

      self.assertEqual(self._Test(pattern), [])

    for pattern in ["*", "???*"]:

      self.assertEqual(self._Test(pattern), self.names)

    self.assertEqual(self._Test("node1.*.net"), ["node1.example.net"])

    self.assertEqual(self._Test("*.example.net"), ["node1.example.net"])

    self.assertEqual(self._Test("web1.example.com"), ["web1.example.com"])

    for pattern in ["*.*.*.*", "???", "*.site"]:

      self.assertEqual(self._Test(pattern), ["sub.site.example.com"])

    self.assertEqual(self._Test("node1"), [

      "node1.example.com",

      "node1.example.net",

      ])

    self.assertEqual(self._Test("node?*.example.*"), [

      "node1.example.com",

      "node2-0.example.com",

      "node2-1.example.com",

      "node1.example.net",

      ])

    self.assertEqual(self._Test("*-?"), [

      "node2-0.example.com",

      "node2-1.example.com",

      ])

    self.assertEqual(self._Test("node2-?.example.com"), [

      "node2-0.example.com",

      "node2-1.example.com",

      ])

class TestFormatUnit(unittest.TestCase):

  """Test case for the FormatUnit function"""

  def testMiB(self):

    self.assertEqual(utils.FormatUnit(1, "h"), "1M")

    self.assertEqual(utils.FormatUnit(100, "h"), "100M")

    self.assertEqual(utils.FormatUnit(1023, "h"), "1023M")

    self.assertEqual(utils.FormatUnit(1, "m"), "1")

    self.assertEqual(utils.FormatUnit(100, "m"), "100")

    self.assertEqual(utils.FormatUnit(1023, "m"), "1023")

    self.assertEqual(utils.FormatUnit(1024, "m"), "1024")

    self.assertEqual(utils.FormatUnit(1536, "m"), "1536")

    self.assertEqual(utils.FormatUnit(17133, "m"), "17133")

    self.assertEqual(utils.FormatUnit(1024 * 1024 - 1, "m"), "1048575")

  def testGiB(self):

    self.assertEqual(utils.FormatUnit(1024, "h"), "1.0G")

    self.assertEqual(utils.FormatUnit(1536, "h"), "1.5G")

    self.assertEqual(utils.FormatUnit(17133, "h"), "16.7G")

    self.assertEqual(utils.FormatUnit(1024 * 1024 - 1, "h"), "1024.0G")

    self.assertEqual(utils.FormatUnit(1024, "g"), "1.0")

    self.assertEqual(utils.FormatUnit(1536, "g"), "1.5")

    self.assertEqual(utils.FormatUnit(17133, "g"), "16.7")

    self.assertEqual(utils.FormatUnit(1024 * 1024 - 1, "g"), "1024.0")

    self.assertEqual(utils.FormatUnit(1024 * 1024, "g"), "1024.0")

    self.assertEqual(utils.FormatUnit(5120 * 1024, "g"), "5120.0")

    self.assertEqual(utils.FormatUnit(29829 * 1024, "g"), "29829.0")

  def testTiB(self):

    self.assertEqual(utils.FormatUnit(1024 * 1024, "h"), "1.0T")

    self.assertEqual(utils.FormatUnit(5120 * 1024, "h"), "5.0T")

    self.assertEqual(utils.FormatUnit(29829 * 1024, "h"), "29.1T")

    self.assertEqual(utils.FormatUnit(1024 * 1024, "t"), "1.0")

    self.assertEqual(utils.FormatUnit(5120 * 1024, "t"), "5.0")

    self.assertEqual(utils.FormatUnit(29829 * 1024, "t"), "29.1")

  def testErrors(self):

    self.assertRaises(errors.ProgrammerError, utils.FormatUnit, 1, "a")

class TestParseUnit(unittest.TestCase):

  """Test case for the ParseUnit function"""

  SCALES = (("", 1),

            ("M", 1), ("G", 1024), ("T", 1024 * 1024),

            ("MB", 1), ("GB", 1024), ("TB", 1024 * 1024),

            ("MiB", 1), ("GiB", 1024), ("TiB", 1024 * 1024))

  def testRounding(self):

    self.assertEqual(utils.ParseUnit("0"), 0)

    self.assertEqual(utils.ParseUnit("1"), 4)

    self.assertEqual(utils.ParseUnit("2"), 4)

    self.assertEqual(utils.ParseUnit("3"), 4)

    self.assertEqual(utils.ParseUnit("124"), 124)

    self.assertEqual(utils.ParseUnit("125"), 128)

    self.assertEqual(utils.ParseUnit("126"), 128)

    self.assertEqual(utils.ParseUnit("127"), 128)

    self.assertEqual(utils.ParseUnit("128"), 128)

    self.assertEqual(utils.ParseUnit("129"), 132)

    self.assertEqual(utils.ParseUnit("130"), 132)

  def testFloating(self):

    self.assertEqual(utils.ParseUnit("0"), 0)

    self.assertEqual(utils.ParseUnit("0.5"), 4)

    self.assertEqual(utils.ParseUnit("1.75"), 4)

    self.assertEqual(utils.ParseUnit("1.99"), 4)

    self.assertEqual(utils.ParseUnit("2.00"), 4)

    self.assertEqual(utils.ParseUnit("2.01"), 4)

    self.assertEqual(utils.ParseUnit("3.99"), 4)

    self.assertEqual(utils.ParseUnit("4.00"), 4)

    self.assertEqual(utils.ParseUnit("4.01"), 8)

    self.assertEqual(utils.ParseUnit("1.5G"), 1536)

    self.assertEqual(utils.ParseUnit("1.8G"), 1844)

    self.assertEqual(utils.ParseUnit("8.28T"), 8682212)

  def testSuffixes(self):

    for sep in ("", " ", "   ", "\t", "\t "):

      for suffix, scale in self.SCALES:

        for func in (lambda x: x, str.lower, str.upper):

          self.assertEqual(utils.ParseUnit("1024" + sep + func(suffix)),

                           1024 * scale)

  def testInvalidInput(self):

    for sep in ("-", "_", ",", "a"):

      for suffix, _ in self.SCALES:

        self.assertRaises(errors.UnitParseError, utils.ParseUnit,

                          "1" + sep + suffix)

    for suffix, _ in self.SCALES:

      self.assertRaises(errors.UnitParseError, utils.ParseUnit,

                        "1,3" + suffix)

class TestShellQuoting(unittest.TestCase):

  """Test case for shell quoting functions"""

  def testShellQuote(self):

    self.assertEqual(utils.ShellQuote("abc"), "abc")

    self.assertEqual(utils.ShellQuote('ab"c'), "'ab\"c'")

    self.assertEqual(utils.ShellQuote("a'bc"), "'a'\\''bc'")

    self.assertEqual(utils.ShellQuote("a b c"), "'a b c'")

    self.assertEqual(utils.ShellQuote("a b\\ c"), "'a b\\ c'")

  def testShellQuoteArgs(self):

    self.assertEqual(utils.ShellQuoteArgs(["a", "b", "c"]), "a b c")

    self.assertEqual(utils.ShellQuoteArgs(['a', 'b"', 'c']), "a 'b\"' c")

    self.assertEqual(utils.ShellQuoteArgs(['a', 'b\'', 'c']), "a 'b'\\\''' c")

class TestShellWriter(unittest.TestCase):

  def test(self):

    buf = StringIO()

    sw = utils.ShellWriter(buf)

    sw.Write("#!/bin/bash")

    sw.Write("if true; then")

    sw.IncIndent()

    try:

      sw.Write("echo true")

      sw.Write("for i in 1 2 3")

      sw.Write("do")

      sw.IncIndent()

      try:

        self.assertEqual(sw._indent, 2)

        sw.Write("date")

      finally:

        sw.DecIndent()

      sw.Write("done")

    finally:

      sw.DecIndent()

    sw.Write("echo %s", utils.ShellQuote("Hello World"))

    sw.Write("exit 0")

    self.assertEqual(sw._indent, 0)

    output = buf.getvalue()

    self.assert_(output.endswith("\n"))

    lines = output.splitlines()

    self.assertEqual(len(lines), 9)

    self.assertEqual(lines[0], "#!/bin/bash")

    self.assert_(re.match(r"^\s+date$", lines[5]))

    self.assertEqual(lines[7], "echo 'Hello World'")

  def testEmpty(self):

    buf = StringIO()

    sw = utils.ShellWriter(buf)

    sw = None

    self.assertEqual(buf.getvalue(), "")

  def testEmptyNoIndent(self):

    buf = StringIO()

    sw = utils.ShellWriter(buf, indent=False)

    sw = None

    self.assertEqual(buf.getvalue(), "")

  @classmethod

  def _AddLevel(cls, sw, level):

    if level == 6:

      return

    sw.IncIndent()

    try:

      # Add empty line, it should not be indented

      sw.Write("")

      sw.Write(str(level))

      cls._AddLevel(sw, level + 1)

    finally:

      sw.DecIndent()

  def testEmptyLines(self):

    buf = StringIO()

    sw = utils.ShellWriter(buf)

    self._AddLevel(sw, 1)

    self.assertEqual(buf.getvalue(),

                     "".join("\n%s%s\n" % (i * "  ", i) for i in range(1, 6)))

  def testEmptyLinesNoIndent(self):

    buf = StringIO()

    sw = utils.ShellWriter(buf, indent=False)

    self._AddLevel(sw, 1)

    self.assertEqual(buf.getvalue(),

                     "".join("\n%s\n" % i for i in range(1, 6)))

class TestNormalizeAndValidateMac(unittest.TestCase):

  def testInvalid(self):

    for i in ["xxx", "00:11:22:33:44:55:66", "zz:zz:zz:zz:zz:zz"]:

      self.assertRaises(errors.OpPrereqError, utils.NormalizeAndValidateMac, i)

  def testNormalization(self):

    for mac in ["aa:bb:cc:dd:ee:ff", "00:AA:11:bB:22:cc"]:

      self.assertEqual(utils.NormalizeAndValidateMac(mac), mac.lower())

class TestNormalizeAndValidateThreeOctetMacPrefix(unittest.TestCase):

  def testInvalid(self):

    for i in ["xxx", "00:11:22:33:44:55:66", "zz:zz:zz:zz:zz:zz",

              "aa:bb:cc:dd:ee:ff", "00:AA:11:bB:22:cc",

              "00:11:"]:

      self.assertRaises(errors.OpPrereqError,

                        utils.NormalizeAndValidateThreeOctetMacPrefix, i)

  def testNormalization(self):

    for mac in ["aa:bb:cc", "00:AA:11"]:

      self.assertEqual(utils.NormalizeAndValidateThreeOctetMacPrefix(mac),

                       mac.lower())

class TestSafeEncode(unittest.TestCase):

  """Test case for SafeEncode"""

  def testAscii(self):

    for txt in [string.digits, string.letters, string.punctuation]:

      self.failUnlessEqual(txt, utils.SafeEncode(txt))

  def testDoubleEncode(self):

    for i in range(255):

      txt = utils.SafeEncode(chr(i))

      self.failUnlessEqual(txt, utils.SafeEncode(txt))

  def testUnicode(self):

    # 1024 is high enough to catch non-direct ASCII mappings

    for i in range(1024):

      txt = utils.SafeEncode(unichr(i))

      self.failUnlessEqual(txt, utils.SafeEncode(txt))

class TestUnescapeAndSplit(unittest.TestCase):

  """Testing case for UnescapeAndSplit"""

  def setUp(self):

    # testing more that one separator for regexp safety

    self._seps = [",", "+", ".", ":"]

  def testSimple(self):

    a = ["a", "b", "c", "d"]

    for sep in self._seps:

      self.failUnlessEqual(utils.UnescapeAndSplit(sep.join(a), sep=sep), a)

  def testEscape(self):

    for sep in self._seps:

      a = ["a", "b\\" + sep + "c", "d"]

      b = ["a", "b" + sep + "c", "d"]

      self.failUnlessEqual(utils.UnescapeAndSplit(sep.join(a), sep=sep), b)

  def testDoubleEscape(self):

    for sep in self._seps:

      a = ["a", "b\\\\", "c", "d"]

      b = ["a", "b\\", "c", "d"]

      self.failUnlessEqual(utils.UnescapeAndSplit(sep.join(a), sep=sep), b)

  def testThreeEscape(self):

    for sep in self._seps:

      a = ["a", "b\\\\\\" + sep + "c", "d"]

      b = ["a", "b\\" + sep + "c", "d"]

      self.failUnlessEqual(utils.UnescapeAndSplit(sep.join(a), sep=sep), b)

  def testEscapeAtEnd(self):

    for sep in self._seps:

      self.assertEqual(utils.UnescapeAndSplit("\\", sep=sep), ["\\"])

      a = ["a", "b\\", "c"]

      b = ["a", "b" + sep + "c\\"]

      self.assertEqual(utils.UnescapeAndSplit("%s\\" % sep.join(a), sep=sep), b)

      a = ["\\" + sep, "\\" + sep, "c", "d\\.moo"]

      b = [sep, sep, "c", "d.moo\\"]

      self.assertEqual(utils.UnescapeAndSplit("%s\\" % sep.join(a), sep=sep), b)

  def testMultipleEscapes(self):

    for sep in self._seps:

      a = ["a", "b\\" + sep + "c", "d\\" + sep + "e\\" + sep + "f", "g"]

      b = ["a", "b" + sep + "c", "d" + sep + "e" + sep + "f", "g"]

      self.failUnlessEqual(utils.UnescapeAndSplit(sep.join(a), sep=sep), b)

class TestEscapeAndJoin(unittest.TestCase):

  def verifyParsesCorrect(self, args):

    for sep in [",", "+", ".", ":"]:

      self.assertEqual(utils.UnescapeAndSplit(

          utils.EscapeAndJoin(args, sep=sep),

          sep=sep), args)

  def test(self):

    self.verifyParsesCorrect(["a", "b", "c"])

    self.verifyParsesCorrect(["2.10.0", "12345"])

    self.verifyParsesCorrect(["2.10.0~alpha1", "12345"])

    self.verifyParsesCorrect(["..:", ",,+"])

    self.verifyParsesCorrect(["a\\", "b\\\\", "c"])

    self.verifyParsesCorrect(["a"])

    self.verifyParsesCorrect(["+"])

    self.verifyParsesCorrect(["\\"])

    self.verifyParsesCorrect(["\\\\"])

class TestCommaJoin(unittest.TestCase):

  def test(self):

    self.assertEqual(utils.CommaJoin([]), "")

    self.assertEqual(utils.CommaJoin([1, 2, 3]), "1, 2, 3")

    self.assertEqual(utils.CommaJoin(["Hello"]), "Hello")

    self.assertEqual(utils.CommaJoin(["Hello", "World"]), "Hello, World")

    self.assertEqual(utils.CommaJoin(["Hello", "World", 99]),

                     "Hello, World, 99")

class TestFormatTime(unittest.TestCase):

  """Testing case for FormatTime"""

  @staticmethod

  def _TestInProcess(tz, timestamp, usecs, expected):

    os.environ["TZ"] = tz

    time.tzset()

    return utils.FormatTime(timestamp, usecs=usecs) == expected

  def _Test(self, *args):

    # Need to use separate process as we want to change TZ

    self.assert_(utils.RunInSeparateProcess(self._TestInProcess, *args))

  def test(self):

    self._Test("UTC", 0, None, "1970-01-01 00:00:00")

    self._Test("America/Sao_Paulo", 1292606926, None, "2010-12-17 15:28:46")

    self._Test("Europe/London", 1292606926, None, "2010-12-17 17:28:46")

    self._Test("Europe/Zurich", 1292606926, None, "2010-12-17 18:28:46")

    self._Test("Europe/Zurich", 1332944288, 8787, "2012-03-28 16:18:08.008787")

    self._Test("Australia/Sydney", 1292606926, None, "2010-12-18 04:28:46")

    self._Test("Australia/Sydney", 1292606926, None, "2010-12-18 04:28:46")

    self._Test("Australia/Sydney", 1292606926, 999999,

               "2010-12-18 04:28:46.999999")

  def testNone(self):

    self.failUnlessEqual(utils.FormatTime(None), "N/A")

  def testInvalid(self):

    self.failUnlessEqual(utils.FormatTime(()), "N/A")

  def testNow(self):

    # tests that we accept time.time input

    utils.FormatTime(time.time())

    # tests that we accept int input

    utils.FormatTime(int(time.time()))

class TestFormatSeconds(unittest.TestCase):

  def test(self):

    self.assertEqual(utils.FormatSeconds(1), "1s")

    self.assertEqual(utils.FormatSeconds(3600), "1h 0m 0s")

    self.assertEqual(utils.FormatSeconds(3599), "59m 59s")

    self.assertEqual(utils.FormatSeconds(7200), "2h 0m 0s")

    self.assertEqual(utils.FormatSeconds(7201), "2h 0m 1s")

    self.assertEqual(utils.FormatSeconds(7281), "2h 1m 21s")

    self.assertEqual(utils.FormatSeconds(29119), "8h 5m 19s")

    self.assertEqual(utils.FormatSeconds(19431228), "224d 21h 33m 48s")

    self.assertEqual(utils.FormatSeconds(-1), "-1s")

    self.assertEqual(utils.FormatSeconds(-282), "-282s")

    self.assertEqual(utils.FormatSeconds(-29119), "-29119s")

  def testFloat(self):

    self.assertEqual(utils.FormatSeconds(1.3), "1s")

    self.assertEqual(utils.FormatSeconds(1.9), "2s")

    self.assertEqual(utils.FormatSeconds(3912.12311), "1h 5m 12s")

    self.assertEqual(utils.FormatSeconds(3912.8), "1h 5m 13s")

class TestLineSplitter(unittest.TestCase):

  def test(self):

    lines = []

    ls = utils.LineSplitter(lines.append)

    ls.write("Hello World\n")

    self.assertEqual(lines, [])

    ls.write("Foo\n Bar\r\n ")

    ls.write("Baz")

    ls.write("Moo")

    self.assertEqual(lines, [])

    ls.flush()

    self.assertEqual(lines, ["Hello World", "Foo", " Bar"])

    ls.close()

    self.assertEqual(lines, ["Hello World", "Foo", " Bar", " BazMoo"])

  def _testExtra(self, line, all_lines, p1, p2):

    self.assertEqual(p1, 999)

    self.assertEqual(p2, "extra")

    all_lines.append(line)

  def testExtraArgsNoFlush(self):

    lines = []

    ls = utils.LineSplitter(self._testExtra, lines, 999, "extra")

    ls.write("\n\nHello World\n")

    ls.write("Foo\n Bar\r\n ")

    ls.write("")

    ls.write("Baz")

    ls.write("Moo\n\nx\n")

    self.assertEqual(lines, [])

    ls.close()

    self.assertEqual(lines, ["", "", "Hello World", "Foo", " Bar", " BazMoo",

                             "", "x"])

class TestIsValidShellParam(unittest.TestCase):

  def test(self):

    for val, result in [

      ("abc", True),

      ("ab;cd", False),

      ]:

      self.assertEqual(utils.IsValidShellParam(val), result)

class TestBuildShellCmd(unittest.TestCase):

  def test(self):

    self.assertRaises(errors.ProgrammerError, utils.BuildShellCmd,

                      "ls %s", "ab;cd")

    self.assertEqual(utils.BuildShellCmd("ls %s", "ab"), "ls ab")

class TestOrdinal(unittest.TestCase):

  def test(self):

    checks = {

      0: "0th", 1: "1st", 2: "2nd", 3: "3rd", 4: "4th", 5: "5th", 6: "6th",

      7: "7th", 8: "8th", 9: "9th", 10: "10th", 11: "11th", 12: "12th",

      13: "13th", 14: "14th", 15: "15th", 16: "16th", 17: "17th",

      18: "18th", 19: "19th", 20: "20th", 21: "21st", 25: "25th", 30: "30th",

      32: "32nd", 40: "40th", 50: "50th", 55: "55th", 60: "60th", 62: "62nd",

      70: "70th", 80: "80th", 83: "83rd", 90: "90th", 91: "91st",

      582: "582nd", 999: "999th",

      }

    for value, ordinal in checks.items():

      self.assertEqual(utils.FormatOrdinal(value), ordinal)

class TestTruncate(unittest.TestCase):

  def _Test(self, text, length):

    result = utils.Truncate(text, length)

    self.assertTrue(len(result) <= length)

    return result

  def test(self):

    self.assertEqual(self._Test("", 80), "")

    self.assertEqual(self._Test("abc", 4), "abc")

    self.assertEqual(self._Test("Hello World", 80), "Hello World")

    self.assertEqual(self._Test("Hello World", 4), "H...")

    self.assertEqual(self._Test("Hello World", 5), "He...")

    for i in [4, 10, 100]:

      data = i * "FooBarBaz"

      self.assertEqual(self._Test(data, len(data)), data)

    for (length, exp) in [(8, u"T\u00e4st\u2026xyz"), (7, u"T\u00e4st...")]:

      self.assertEqual(self._Test(u"T\u00e4st\u2026xyz", length), exp)

    self.assertEqual(self._Test(range(100), 20), "[0, 1, 2, 3, 4, 5...")

  def testError(self):

    for i in range(4):

      self.assertRaises(AssertionError, utils.Truncate, "", i)

class TestFilterEmptyLinesAndComments(unittest.TestCase):