/brz/remove-bazaar

# Copyright (C) 2005 Canonical Ltd

#

# 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

from cStringIO import StringIO

from bzrlib import (

    errors, 

    inventory, 

    xml7,

    xml8,

    xml_serializer,

    )

from bzrlib.tests import TestCase

from bzrlib.inventory import Inventory, InventoryEntry

from bzrlib.xml4 import serializer_v4

import bzrlib.xml5

_working_inventory_v4 = """<inventory file_id="TREE_ROOT">

<entry file_id="bar-20050901064931-73b4b1138abc9cd2" kind="file" name="bar" parent_id="TREE_ROOT" />

<entry file_id="foo-20050801201819-4139aa4a272f4250" kind="directory" name="foo" parent_id="TREE_ROOT" />

<entry file_id="bar-20050824000535-6bc48cfad47ed134" kind="file" name="bar" parent_id="foo-20050801201819-4139aa4a272f4250" />

</inventory>"""

_revision_v4 = """<revision committer="Martin Pool &lt;mbp@sourcefrog.net&gt;"

    inventory_id="mbp@sourcefrog.net-20050905080035-e0439293f8b6b9f9"

    inventory_sha1="e79c31c1deb64c163cf660fdedd476dd579ffd41"

    revision_id="mbp@sourcefrog.net-20050905080035-e0439293f8b6b9f9"

    timestamp="1125907235.212"

    timezone="36000">

<message>- start splitting code for xml (de)serialization away from objects

  preparatory to supporting multiple formats by a single library

</message>

<parents>

<revision_ref revision_id="mbp@sourcefrog.net-20050905063503-43948f59fa127d92" revision_sha1="7bdf4cc8c5bdac739f8cf9b10b78cf4b68f915ff" />

</parents>

</revision>

"""

_revision_v5 = """<revision committer="Martin Pool &lt;mbp@sourcefrog.net&gt;"

    inventory_sha1="e79c31c1deb64c163cf660fdedd476dd579ffd41"

    revision_id="mbp@sourcefrog.net-20050905080035-e0439293f8b6b9f9"

    timestamp="1125907235.212"

    timezone="36000">

<message>- start splitting code for xml (de)serialization away from objects

  preparatory to supporting multiple formats by a single library

</message>

<parents>

<revision_ref revision_id="mbp@sourcefrog.net-20050905063503-43948f59fa127d92"/>

</parents>

</revision>

"""

_revision_v5_utc = """\

<revision committer="Martin Pool &lt;mbp@sourcefrog.net&gt;"

    inventory_sha1="e79c31c1deb64c163cf660fdedd476dd579ffd41"

    revision_id="mbp@sourcefrog.net-20050905080035-e0439293f8b6b9f9"

    timestamp="1125907235.212"

    timezone="0">

<message>- start splitting code for xml (de)serialization away from objects

  preparatory to supporting multiple formats by a single library

</message>

<parents>

<revision_ref revision_id="mbp@sourcefrog.net-20050905063503-43948f59fa127d92"/>

</parents>

</revision>

"""

_committed_inv_v5 = """<inventory>

<file file_id="bar-20050901064931-73b4b1138abc9cd2" 

      name="bar" parent_id="TREE_ROOT" 

      revision="mbp@foo-123123"

      text_sha1="A" text_size="1"/>

<directory name="subdir"

           file_id="foo-20050801201819-4139aa4a272f4250"

           parent_id="TREE_ROOT" 

           revision="mbp@foo-00"/>

<file executable="yes" file_id="bar-20050824000535-6bc48cfad47ed134" 

      name="bar" parent_id="foo-20050801201819-4139aa4a272f4250" 

      revision="mbp@foo-00"

      text_sha1="B" text_size="0"/>

</inventory>

"""

_basis_inv_v5 = """<inventory revision_id="mbp@sourcefrog.net-20050905063503-43948f59fa127d92">

<file file_id="bar-20050901064931-73b4b1138abc9cd2" 

      name="bar" parent_id="TREE_ROOT" 

      revision="mbp@foo-123123"/>

<directory name="subdir"

           file_id="foo-20050801201819-4139aa4a272f4250"

           parent_id="TREE_ROOT" 

           revision="mbp@foo-00"/>

<file file_id="bar-20050824000535-6bc48cfad47ed134" 

      name="bar" parent_id="foo-20050801201819-4139aa4a272f4250" 

      revision="mbp@foo-00"/>

</inventory>

"""

# DO NOT REFLOW THIS. Its the exact revision we want.

_expected_rev_v5 = """<revision committer="Martin Pool &lt;mbp@sourcefrog.net&gt;" format="5" inventory_sha1="e79c31c1deb64c163cf660fdedd476dd579ffd41" revision_id="mbp@sourcefrog.net-20050905080035-e0439293f8b6b9f9" timestamp="1125907235.212" timezone="36000">

<message>- start splitting code for xml (de)serialization away from objects

  preparatory to supporting multiple formats by a single library

</message>

<parents>

<revision_ref revision_id="mbp@sourcefrog.net-20050905063503-43948f59fa127d92" />

</parents>

</revision>

"""

# DO NOT REFLOW THIS. Its the exact inventory we want.

_expected_inv_v5 = """<inventory format="5">

<file file_id="bar-20050901064931-73b4b1138abc9cd2" name="bar" revision="mbp@foo-123123" text_sha1="A" text_size="1" />

<directory file_id="foo-20050801201819-4139aa4a272f4250" name="subdir" revision="mbp@foo-00" />

<file executable="yes" file_id="bar-20050824000535-6bc48cfad47ed134" name="bar" parent_id="foo-20050801201819-4139aa4a272f4250" revision="mbp@foo-00" text_sha1="B" text_size="0" />

</inventory>

"""

_expected_inv_v5_root = """<inventory file_id="f&lt;" format="5" revision_id="mother!">

<file file_id="bar-20050901064931-73b4b1138abc9cd2" name="bar" parent_id="f&lt;" revision="mbp@foo-123123" text_sha1="A" text_size="1" />

<directory file_id="foo-20050801201819-4139aa4a272f4250" name="subdir" parent_id="f&lt;" revision="mbp@foo-00" />

<file executable="yes" file_id="bar-20050824000535-6bc48cfad47ed134" name="bar" parent_id="foo-20050801201819-4139aa4a272f4250" revision="mbp@foo-00" text_sha1="B" text_size="0" />

<symlink file_id="link-1" name="link" parent_id="foo-20050801201819-4139aa4a272f4250" revision="mbp@foo-00" symlink_target="a" />

</inventory>

"""

_expected_inv_v7 = """<inventory format="7" revision_id="rev_outer">

<directory file_id="tree-root-321" name="" revision="rev_outer" />

<directory file_id="dir-id" name="dir" parent_id="tree-root-321" revision="rev_outer" />

<file file_id="file-id" name="file" parent_id="tree-root-321" revision="rev_outer" text_sha1="A" text_size="1" />

<symlink file_id="link-id" name="link" parent_id="tree-root-321" revision="rev_outer" symlink_target="a" />

<tree-reference file_id="nested-id" name="nested" parent_id="tree-root-321" revision="rev_outer" reference_revision="rev_inner" />

</inventory>

"""

_expected_rev_v8 = """<revision committer="Martin Pool &lt;mbp@sourcefrog.net&gt;" format="8" inventory_sha1="e79c31c1deb64c163cf660fdedd476dd579ffd41" revision_id="mbp@sourcefrog.net-20050905080035-e0439293f8b6b9f9" timestamp="1125907235.212" timezone="36000">

<message>- start splitting code for xml (de)serialization away from objects

  preparatory to supporting multiple formats by a single library

</message>

<parents>

<revision_ref revision_id="mbp@sourcefrog.net-20050905063503-43948f59fa127d92" />

</parents>

</revision>

"""

_expected_inv_v8 = """<inventory format="8" revision_id="rev_outer">

<directory file_id="tree-root-321" name="" revision="rev_outer" />

<directory file_id="dir-id" name="dir" parent_id="tree-root-321" revision="rev_outer" />

<file file_id="file-id" name="file" parent_id="tree-root-321" revision="rev_outer" text_sha1="A" text_size="1" />

<symlink file_id="link-id" name="link" parent_id="tree-root-321" revision="rev_outer" symlink_target="a" />

</inventory>

"""

_revision_utf8_v5 = """<revision committer="Erik B&#229;gfors &lt;erik@foo.net&gt;"

    inventory_sha1="e79c31c1deb64c163cf660fdedd476dd579ffd41"

    revision_id="erik@bågfors-02"

    timestamp="1125907235.212"

    timezone="36000">

<message>Include &#181;nicode characters

</message>

<parents>

<revision_ref revision_id="erik@b&#229;gfors-01"/>

</parents>

</revision>

"""

_inventory_utf8_v5 = """<inventory file_id="TRE&#233;_ROOT" format="5"

                                   revision_id="erik@bågfors-02">

<file file_id="b&#229;r-01"

      name="bår" parent_id="TREé_ROOT"

      revision="erik@bågfors-01"/>

<directory name="s&#181;bdir"

           file_id="sµbdir-01"

           parent_id="TREé_ROOT"

           revision="erik@bågfors-01"/>

<file executable="yes" file_id="b&#229;r-02"

      name="bår" parent_id="sµbdir-01"

      revision="erik@bågfors-02"/>

</inventory>

"""

# Before revision_id was always stored as an attribute

_inventory_v5a = """<inventory format="5">

</inventory>

"""

# Before revision_id was always stored as an attribute

_inventory_v5b = """<inventory format="5" revision_id="a-rev-id">

</inventory>

"""

class TestSerializer(TestCase):

    """Test XML serialization"""

    def test_canned_inventory(self):

        """Test unpacked a canned inventory v4 file."""

        inp = StringIO(_working_inventory_v4)

        inv = serializer_v4.read_inventory(inp)

        self.assertEqual(len(inv), 4)

        self.assert_('bar-20050901064931-73b4b1138abc9cd2' in inv)

    def test_unpack_revision(self):

        """Test unpacking a canned revision v4"""

        inp = StringIO(_revision_v4)

        rev = serializer_v4.read_revision(inp)

        eq = self.assertEqual

        eq(rev.committer,

           "Martin Pool <mbp@sourcefrog.net>")

        eq(rev.inventory_id,

           "mbp@sourcefrog.net-20050905080035-e0439293f8b6b9f9")

        eq(len(rev.parent_ids), 1)

        eq(rev.parent_ids[0],

           "mbp@sourcefrog.net-20050905063503-43948f59fa127d92")

    def test_unpack_revision_5(self):

        """Test unpacking a canned revision v5"""

        inp = StringIO(_revision_v5)

        rev = bzrlib.xml5.serializer_v5.read_revision(inp)

        eq = self.assertEqual

        eq(rev.committer,

           "Martin Pool <mbp@sourcefrog.net>")

        eq(len(rev.parent_ids), 1)

        eq(rev.timezone, 36000)

        eq(rev.parent_ids[0],

           "mbp@sourcefrog.net-20050905063503-43948f59fa127d92")

    def test_unpack_revision_5_utc(self):

        inp = StringIO(_revision_v5_utc)

        rev = bzrlib.xml5.serializer_v5.read_revision(inp)

        eq = self.assertEqual

        eq(rev.committer,

           "Martin Pool <mbp@sourcefrog.net>")

        eq(len(rev.parent_ids), 1)

        eq(rev.timezone, 0)

        eq(rev.parent_ids[0],

           "mbp@sourcefrog.net-20050905063503-43948f59fa127d92")

    def test_unpack_inventory_5(self):

        """Unpack canned new-style inventory"""

        inp = StringIO(_committed_inv_v5)

        inv = bzrlib.xml5.serializer_v5.read_inventory(inp)

        eq = self.assertEqual

        eq(len(inv), 4)

        ie = inv['bar-20050824000535-6bc48cfad47ed134']

        eq(ie.kind, 'file')

        eq(ie.revision, 'mbp@foo-00')

        eq(ie.name, 'bar')

        eq(inv[ie.parent_id].kind, 'directory')

    def test_unpack_basis_inventory_5(self):

        """Unpack canned new-style inventory"""

        inp = StringIO(_basis_inv_v5)

        inv = bzrlib.xml5.serializer_v5.read_inventory(inp)

        eq = self.assertEqual

        eq(len(inv), 4)

        eq(inv.revision_id, 'mbp@sourcefrog.net-20050905063503-43948f59fa127d92')

        ie = inv['bar-20050824000535-6bc48cfad47ed134']

        eq(ie.kind, 'file')

        eq(ie.revision, 'mbp@foo-00')

        eq(ie.name, 'bar')

        eq(inv[ie.parent_id].kind, 'directory')

    def test_unpack_inventory_5a(self):

        inv = bzrlib.xml5.serializer_v5.read_inventory_from_string(

                _inventory_v5a, revision_id='test-rev-id')

        self.assertEqual('test-rev-id', inv.root.revision)

    def test_unpack_inventory_5b(self):

        inv = bzrlib.xml5.serializer_v5.read_inventory_from_string(

                _inventory_v5b, revision_id='test-rev-id')

        self.assertEqual('a-rev-id', inv.root.revision)

    def test_repack_inventory_5(self):

        inp = StringIO(_committed_inv_v5)

        inv = bzrlib.xml5.serializer_v5.read_inventory(inp)

        outp = StringIO()

        bzrlib.xml5.serializer_v5.write_inventory(inv, outp)

        self.assertEqualDiff(_expected_inv_v5, outp.getvalue())

        inv2 = bzrlib.xml5.serializer_v5.read_inventory(StringIO(outp.getvalue()))

        self.assertEqual(inv, inv2)

    def assertRoundTrips(self, xml_string):

        inp = StringIO(xml_string)

        inv = bzrlib.xml5.serializer_v5.read_inventory(inp)

        outp = StringIO()

        bzrlib.xml5.serializer_v5.write_inventory(inv, outp)

        self.assertEqualDiff(xml_string, outp.getvalue())

        lines = bzrlib.xml5.serializer_v5.write_inventory_to_lines(inv)

        outp.seek(0)

        self.assertEqual(outp.readlines(), lines)

        inv2 = bzrlib.xml5.serializer_v5.read_inventory(StringIO(outp.getvalue()))

        self.assertEqual(inv, inv2)

    def tests_serialize_inventory_v5_with_root(self):

        self.assertRoundTrips(_expected_inv_v5_root)

    def check_repack_revision(self, txt):

        """Check that repacking a revision yields the same information"""

        inp = StringIO(txt)

        rev = bzrlib.xml5.serializer_v5.read_revision(inp)

        outp = StringIO()

        bzrlib.xml5.serializer_v5.write_revision(rev, outp)

        outfile_contents = outp.getvalue()

        rev2 = bzrlib.xml5.serializer_v5.read_revision(StringIO(outfile_contents))

        self.assertEqual(rev, rev2)

    def test_repack_revision_5(self):

        """Round-trip revision to XML v5"""

        self.check_repack_revision(_revision_v5)

    def test_repack_revision_5_utc(self):

        self.check_repack_revision(_revision_v5_utc)

    def test_pack_revision_5(self):

        """Pack revision to XML v5"""

        # fixed 20051025, revisions should have final newline

        rev = bzrlib.xml5.serializer_v5.read_revision_from_string(_revision_v5)

        outp = StringIO()

        bzrlib.xml5.serializer_v5.write_revision(rev, outp)

        outfile_contents = outp.getvalue()

        self.assertEqual(outfile_contents[-1], '\n')

        self.assertEqualDiff(outfile_contents, bzrlib.xml5.serializer_v5.write_revision_to_string(rev))

        self.assertEqualDiff(outfile_contents, _expected_rev_v5)

    def test_empty_property_value(self):

        """Create an empty property value check that it serializes correctly"""

        s_v5 = bzrlib.xml5.serializer_v5

        rev = s_v5.read_revision_from_string(_revision_v5)

        outp = StringIO()

        props = {'empty':'', 'one':'one'}

        rev.properties = props

        txt = s_v5.write_revision_to_string(rev)

        new_rev = s_v5.read_revision_from_string(txt)

        self.assertEqual(props, new_rev.properties)

    def get_sample_inventory(self):

        inv = Inventory('tree-root-321', revision_id='rev_outer')

        inv.add(inventory.InventoryFile('file-id', 'file', 'tree-root-321'))

        inv.add(inventory.InventoryDirectory('dir-id', 'dir', 

                                             'tree-root-321'))

        inv.add(inventory.InventoryLink('link-id', 'link', 'tree-root-321'))

        inv['tree-root-321'].revision = 'rev_outer'

        inv['dir-id'].revision = 'rev_outer'

        inv['file-id'].revision = 'rev_outer'

        inv['file-id'].text_sha1 = 'A'

        inv['file-id'].text_size = 1

        inv['link-id'].revision = 'rev_outer'

        inv['link-id'].symlink_target = 'a'

        return inv

    def test_roundtrip_inventory_v7(self):

        inv = self.get_sample_inventory()

        inv.add(inventory.TreeReference('nested-id', 'nested', 'tree-root-321',

                                        'rev_outer', 'rev_inner'))

        txt = xml7.serializer_v7.write_inventory_to_string(inv)

        lines = xml7.serializer_v7.write_inventory_to_lines(inv)

        self.assertEqual(bzrlib.osutils.split_lines(txt), lines)

        self.assertEqualDiff(_expected_inv_v7, txt)

        inv2 = xml7.serializer_v7.read_inventory_from_string(txt)

        self.assertEqual(5, len(inv2))

        for path, ie in inv.iter_entries():

            self.assertEqual(ie, inv2[ie.file_id])

    def test_wrong_format_v7(self):

        """Can't accidentally open a file with wrong serializer"""

        s_v6 = bzrlib.xml6.serializer_v6

        s_v7 = xml7.serializer_v7

        self.assertRaises(errors.UnexpectedInventoryFormat, 

                          s_v7.read_inventory_from_string, _expected_inv_v5)

        self.assertRaises(errors.UnexpectedInventoryFormat, 

                          s_v6.read_inventory_from_string, _expected_inv_v7)

    def test_tree_reference(self):

        s_v5 = bzrlib.xml5.serializer_v5

        s_v6 = bzrlib.xml6.serializer_v6

        s_v7 = xml7.serializer_v7

        inv = Inventory('tree-root-321', revision_id='rev-outer')

        inv.root.revision = 'root-rev'

        inv.add(inventory.TreeReference('nested-id', 'nested', 'tree-root-321',

                                        'rev-outer', 'rev-inner'))

        self.assertRaises(errors.UnsupportedInventoryKind,

                          s_v5.write_inventory_to_string, inv)

        self.assertRaises(errors.UnsupportedInventoryKind,

                          s_v6.write_inventory_to_string, inv)

        txt = s_v7.write_inventory_to_string(inv)

        lines = s_v7.write_inventory_to_lines(inv)

        self.assertEqual(bzrlib.osutils.split_lines(txt), lines)

        inv2 = s_v7.read_inventory_from_string(txt)

        self.assertEqual('tree-root-321', inv2['nested-id'].parent_id)

        self.assertEqual('rev-outer', inv2['nested-id'].revision)

        self.assertEqual('rev-inner', inv2['nested-id'].reference_revision)

        self.assertRaises(errors.UnsupportedInventoryKind, 

                          s_v6.read_inventory_from_string,

                          txt.replace('format="7"', 'format="6"'))

        self.assertRaises(errors.UnsupportedInventoryKind, 

                          s_v5.read_inventory_from_string,

                          txt.replace('format="7"', 'format="5"'))

    def test_roundtrip_inventory_v8(self):

        inv = self.get_sample_inventory()

        txt = xml8.serializer_v8.write_inventory_to_string(inv)

        inv2 = xml8.serializer_v8.read_inventory_from_string(txt)

        self.assertEqual(4, len(inv2))

        for path, ie in inv.iter_entries():

            self.assertEqual(ie, inv2[ie.file_id])

    def test_inventory_text_v8(self):

        inv = self.get_sample_inventory()

        txt = xml8.serializer_v8.write_inventory_to_string(inv)

        lines = xml8.serializer_v8.write_inventory_to_lines(inv)

        self.assertEqual(bzrlib.osutils.split_lines(txt), lines)

        self.assertEqualDiff(_expected_inv_v8, txt)

    def test_revision_text_v6(self):

        """Pack revision to XML v6"""

        rev = bzrlib.xml6.serializer_v6.read_revision_from_string(

            _expected_rev_v5)

        serialized = bzrlib.xml6.serializer_v6.write_revision_to_string(rev)

        self.assertEqualDiff(serialized, _expected_rev_v5)

    def test_revision_text_v7(self):

        """Pack revision to XML v7"""

        rev = bzrlib.xml7.serializer_v7.read_revision_from_string(

            _expected_rev_v5)

        serialized = bzrlib.xml7.serializer_v7.write_revision_to_string(rev)

        self.assertEqualDiff(serialized, _expected_rev_v5)

    def test_revision_text_v8(self):

        """Pack revision to XML v8"""

        rev = bzrlib.xml8.serializer_v8.read_revision_from_string(

            _expected_rev_v8)

        serialized = bzrlib.xml8.serializer_v8.write_revision_to_string(rev)

        self.assertEqualDiff(serialized, _expected_rev_v8)

    def test_revision_ids_are_utf8(self):

        """Parsed revision_ids should all be utf-8 strings, not unicode."""

        s_v5 = bzrlib.xml5.serializer_v5

        rev = s_v5.read_revision_from_string(_revision_utf8_v5)

        self.assertEqual('erik@b\xc3\xa5gfors-02', rev.revision_id)

        self.assertIsInstance(rev.revision_id, str)

        self.assertEqual(['erik@b\xc3\xa5gfors-01'], rev.parent_ids)

        for parent_id in rev.parent_ids:

            self.assertIsInstance(parent_id, str)

        self.assertEqual(u'Include \xb5nicode characters\n', rev.message)

        self.assertIsInstance(rev.message, unicode)

        # ie.revision should either be None or a utf-8 revision id

        inv = s_v5.read_inventory_from_string(_inventory_utf8_v5)

        rev_id_1 = u'erik@b\xe5gfors-01'.encode('utf8')

        rev_id_2 = u'erik@b\xe5gfors-02'.encode('utf8')

        fid_root = u'TRE\xe9_ROOT'.encode('utf8')

        fid_bar1 = u'b\xe5r-01'.encode('utf8')

        fid_sub = u's\xb5bdir-01'.encode('utf8')

        fid_bar2 = u'b\xe5r-02'.encode('utf8')

        expected = [(u'', fid_root, None, rev_id_2),

                    (u'b\xe5r', fid_bar1, fid_root, rev_id_1),

                    (u's\xb5bdir', fid_sub, fid_root, rev_id_1),

                    (u's\xb5bdir/b\xe5r', fid_bar2, fid_sub, rev_id_2),

                   ]

        self.assertEqual(rev_id_2, inv.revision_id)

        self.assertIsInstance(inv.revision_id, str)

        actual = list(inv.iter_entries_by_dir())

        for ((exp_path, exp_file_id, exp_parent_id, exp_rev_id),

             (act_path, act_ie)) in zip(expected, actual):

            self.assertEqual(exp_path, act_path)

            self.assertIsInstance(act_path, unicode)

            self.assertEqual(exp_file_id, act_ie.file_id)

            self.assertIsInstance(act_ie.file_id, str)

            self.assertEqual(exp_parent_id, act_ie.parent_id)

            if exp_parent_id is not None:

                self.assertIsInstance(act_ie.parent_id, str)

            self.assertEqual(exp_rev_id, act_ie.revision)

            if exp_rev_id is not None:

                self.assertIsInstance(act_ie.revision, str)

        self.assertEqual(len(expected), len(actual))

    def test_registry(self):

        self.assertIs(serializer_v4,

                      xml_serializer.format_registry.get('4'))

        self.assertIs(bzrlib.xml5.serializer_v5,

                      xml_serializer.format_registry.get('5'))

        self.assertIs(bzrlib.xml6.serializer_v6,

                      xml_serializer.format_registry.get('6'))

        self.assertIs(bzrlib.xml7.serializer_v7,

                      xml_serializer.format_registry.get('7'))

        self.assertIs(bzrlib.xml8.serializer_v8,

                      xml_serializer.format_registry.get('8'))

class TestEncodeAndEscape(TestCase):

    """Whitebox testing of the _encode_and_escape function."""

    def setUp(self):

        # Keep the cache clear before and after the test

        bzrlib.xml8._ensure_utf8_re()

        bzrlib.xml8._clear_cache()

        self.addCleanup(bzrlib.xml8._clear_cache)

    def test_simple_ascii(self):

        # _encode_and_escape always appends a final ", because these parameters

        # are being used in xml attributes, and by returning it now, we have to

        # do fewer string operations later.

        val = bzrlib.xml8._encode_and_escape('foo bar')

        self.assertEqual('foo bar"', val)

        # The second time should be cached

        val2 = bzrlib.xml8._encode_and_escape('foo bar')

        self.assertIs(val2, val)

    def test_ascii_with_xml(self):

        self.assertEqual('&'"<>"',

                         bzrlib.xml8._encode_and_escape('&\'"<>'))

    def test_utf8_with_xml(self):

        # u'\xb5\xe5&\u062c'

        utf8_str = '\xc2\xb5\xc3\xa5&\xd8\xac'

        self.assertEqual('µå&ج"',

                         bzrlib.xml8._encode_and_escape(utf8_str))

    def test_unicode(self):

        uni_str = u'\xb5\xe5&\u062c'

        self.assertEqual('µå&ج"',

                         bzrlib.xml8._encode_and_escape(uni_str))