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  • Committer: Canonical.com Patch Queue Manager
  • Date: 2008-02-06 01:45:28 UTC
  • mfrom: (3211.5.4 integration)
  • Revision ID: pqm@pqm.ubuntu.com-20080206014528-rb8v4hl04mgxulb7
(robertc) Tune RemoteRepository.get_parent_map to not send duplicate
        results, and to compress the data,
        reducing round trips further. (Robert Collins)

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1
 
# (C) 2005 Canonical Ltd
 
1
# Copyright (C) 2005, 2006 Canonical Ltd
2
2
# Authors:  Robert Collins <robert.collins@canonical.com>
3
3
#
4
4
# This program is free software; you can redistribute it and/or modify
15
15
# along with this program; if not, write to the Free Software
16
16
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
17
17
 
 
18
from cStringIO import StringIO
18
19
import os
 
20
 
 
21
from bzrlib import (
 
22
    bzrdir,
 
23
    conflicts,
 
24
    errors,
 
25
    workingtree,
 
26
    )
19
27
from bzrlib.branch import Branch
20
 
from bzrlib.errors import NotBranchError, NotVersionedError
21
 
from bzrlib.tests import TestCaseInTempDir
22
 
from bzrlib.trace import mutter
23
 
from bzrlib.workingtree import (TreeEntry, TreeDirectory, TreeFile, TreeLink,
24
 
                                WorkingTree)
25
 
 
26
 
class TestTreeDirectory(TestCaseInTempDir):
 
28
from bzrlib.bzrdir import BzrDir
 
29
from bzrlib.lockdir import LockDir
 
30
from bzrlib.mutabletree import needs_tree_write_lock
 
31
from bzrlib.symbol_versioning import zero_thirteen
 
32
from bzrlib.tests import TestCase, TestCaseWithTransport, TestSkipped
 
33
from bzrlib.transport import get_transport
 
34
from bzrlib.workingtree import (
 
35
    TreeEntry,
 
36
    TreeDirectory,
 
37
    TreeFile,
 
38
    TreeLink,
 
39
    )
 
40
 
 
41
 
 
42
class TestTreeDirectory(TestCaseWithTransport):
27
43
 
28
44
    def test_kind_character(self):
29
45
        self.assertEqual(TreeDirectory().kind_character(), '/')
30
46
 
31
47
 
32
 
class TestTreeEntry(TestCaseInTempDir):
 
48
class TestTreeEntry(TestCaseWithTransport):
33
49
 
34
50
    def test_kind_character(self):
35
51
        self.assertEqual(TreeEntry().kind_character(), '???')
36
52
 
37
53
 
38
 
class TestTreeFile(TestCaseInTempDir):
 
54
class TestTreeFile(TestCaseWithTransport):
39
55
 
40
56
    def test_kind_character(self):
41
57
        self.assertEqual(TreeFile().kind_character(), '')
42
58
 
43
59
 
44
 
class TestTreeLink(TestCaseInTempDir):
 
60
class TestTreeLink(TestCaseWithTransport):
45
61
 
46
62
    def test_kind_character(self):
47
63
        self.assertEqual(TreeLink().kind_character(), '')
48
64
 
49
65
 
50
 
class TestWorkingTree(TestCaseInTempDir):
51
 
 
52
 
    def test_listfiles(self):
53
 
        branch = Branch.initialize(u'.')
54
 
        os.mkdir('dir')
55
 
        print >> open('file', 'w'), "content"
56
 
        os.symlink('target', 'symlink')
57
 
        tree = branch.working_tree()
58
 
        files = list(tree.list_files())
59
 
        self.assertEqual(files[0], ('dir', '?', 'directory', None, TreeDirectory()))
60
 
        self.assertEqual(files[1], ('file', '?', 'file', None, TreeFile()))
61
 
        self.assertEqual(files[2], ('symlink', '?', 'symlink', None, TreeLink()))
62
 
 
63
 
    def test_open_containing(self):
64
 
        branch = Branch.initialize(u'.')
65
 
        wt, relpath = WorkingTree.open_containing()
66
 
        self.assertEqual('', relpath)
67
 
        self.assertEqual(wt.basedir, branch.base)
68
 
        wt, relpath = WorkingTree.open_containing(u'.')
69
 
        self.assertEqual('', relpath)
70
 
        self.assertEqual(wt.basedir, branch.base)
71
 
        wt, relpath = WorkingTree.open_containing('./foo')
72
 
        self.assertEqual('foo', relpath)
73
 
        self.assertEqual(wt.basedir, branch.base)
74
 
        # paths that are urls are just plain wrong for working trees.
75
 
        self.assertRaises(NotBranchError,
76
 
                          WorkingTree.open_containing, 
77
 
                          'file:///' + os.getcwdu())
78
 
 
79
 
    def test_construct_with_branch(self):
80
 
        branch = Branch.initialize(u'.')
81
 
        tree = WorkingTree(branch.base, branch)
82
 
        self.assertEqual(branch, tree.branch)
83
 
        self.assertEqual(branch.base, tree.basedir)
84
 
    
85
 
    def test_construct_without_branch(self):
86
 
        branch = Branch.initialize(u'.')
87
 
        tree = WorkingTree(branch.base)
88
 
        self.assertEqual(branch.base, tree.branch.base)
89
 
        self.assertEqual(branch.base, tree.basedir)
90
 
 
91
 
    def test_basic_relpath(self):
92
 
        # for comprehensive relpath tests, see whitebox.py.
93
 
        branch = Branch.initialize(u'.')
94
 
        tree = WorkingTree(branch.base)
95
 
        self.assertEqual('child',
96
 
                         tree.relpath(os.path.join(os.getcwd(), 'child')))
97
 
 
98
 
    def test_lock_locks_branch(self):
99
 
        branch = Branch.initialize(u'.')
100
 
        tree = WorkingTree(branch.base)
101
 
        tree.lock_read()
102
 
        self.assertEqual(1, tree.branch._lock_count)
103
 
        self.assertEqual('r', tree.branch._lock_mode)
104
 
        tree.unlock()
105
 
        self.assertEqual(None, tree.branch._lock_count)
 
66
class TestDefaultFormat(TestCaseWithTransport):
 
67
 
 
68
    def test_get_set_default_format(self):
 
69
        old_format = workingtree.WorkingTreeFormat.get_default_format()
 
70
        # default is 3
 
71
        self.assertTrue(isinstance(old_format, workingtree.WorkingTreeFormat3))
 
72
        workingtree.WorkingTreeFormat.set_default_format(SampleTreeFormat())
 
73
        try:
 
74
            # the default branch format is used by the meta dir format
 
75
            # which is not the default bzrdir format at this point
 
76
            dir = bzrdir.BzrDirMetaFormat1().initialize('.')
 
77
            dir.create_repository()
 
78
            dir.create_branch()
 
79
            result = dir.create_workingtree()
 
80
            self.assertEqual(result, 'A tree')
 
81
        finally:
 
82
            workingtree.WorkingTreeFormat.set_default_format(old_format)
 
83
        self.assertEqual(old_format, workingtree.WorkingTreeFormat.get_default_format())
 
84
 
 
85
 
 
86
class SampleTreeFormat(workingtree.WorkingTreeFormat):
 
87
    """A sample format
 
88
 
 
89
    this format is initializable, unsupported to aid in testing the 
 
90
    open and open_downlevel routines.
 
91
    """
 
92
 
 
93
    def get_format_string(self):
 
94
        """See WorkingTreeFormat.get_format_string()."""
 
95
        return "Sample tree format."
 
96
 
 
97
    def initialize(self, a_bzrdir, revision_id=None, from_branch=None,
 
98
                   accelerator_tree=None):
 
99
        """Sample branches cannot be created."""
 
100
        t = a_bzrdir.get_workingtree_transport(self)
 
101
        t.put_bytes('format', self.get_format_string())
 
102
        return 'A tree'
 
103
 
 
104
    def is_supported(self):
 
105
        return False
 
106
 
 
107
    def open(self, transport, _found=False):
 
108
        return "opened tree."
 
109
 
 
110
 
 
111
class TestWorkingTreeFormat(TestCaseWithTransport):
 
112
    """Tests for the WorkingTreeFormat facility."""
 
113
 
 
114
    def test_find_format(self):
 
115
        # is the right format object found for a working tree?
 
116
        # create a branch with a few known format objects.
 
117
        self.build_tree(["foo/", "bar/"])
 
118
        def check_format(format, url):
 
119
            dir = format._matchingbzrdir.initialize(url)
 
120
            dir.create_repository()
 
121
            dir.create_branch()
 
122
            format.initialize(dir)
 
123
            t = get_transport(url)
 
124
            found_format = workingtree.WorkingTreeFormat.find_format(dir)
 
125
            self.failUnless(isinstance(found_format, format.__class__))
 
126
        check_format(workingtree.WorkingTreeFormat3(), "bar")
 
127
        
 
128
    def test_find_format_no_tree(self):
 
129
        dir = bzrdir.BzrDirMetaFormat1().initialize('.')
 
130
        self.assertRaises(errors.NoWorkingTree,
 
131
                          workingtree.WorkingTreeFormat.find_format,
 
132
                          dir)
 
133
 
 
134
    def test_find_format_unknown_format(self):
 
135
        dir = bzrdir.BzrDirMetaFormat1().initialize('.')
 
136
        dir.create_repository()
 
137
        dir.create_branch()
 
138
        SampleTreeFormat().initialize(dir)
 
139
        self.assertRaises(errors.UnknownFormatError,
 
140
                          workingtree.WorkingTreeFormat.find_format,
 
141
                          dir)
 
142
 
 
143
    def test_register_unregister_format(self):
 
144
        format = SampleTreeFormat()
 
145
        # make a control dir
 
146
        dir = bzrdir.BzrDirMetaFormat1().initialize('.')
 
147
        dir.create_repository()
 
148
        dir.create_branch()
 
149
        # make a branch
 
150
        format.initialize(dir)
 
151
        # register a format for it.
 
152
        workingtree.WorkingTreeFormat.register_format(format)
 
153
        # which branch.Open will refuse (not supported)
 
154
        self.assertRaises(errors.UnsupportedFormatError, workingtree.WorkingTree.open, '.')
 
155
        # but open_downlevel will work
 
156
        self.assertEqual(format.open(dir), workingtree.WorkingTree.open_downlevel('.'))
 
157
        # unregister the format
 
158
        workingtree.WorkingTreeFormat.unregister_format(format)
 
159
 
 
160
 
 
161
class TestWorkingTreeFormat3(TestCaseWithTransport):
 
162
    """Tests specific to WorkingTreeFormat3."""
 
163
 
 
164
    def test_disk_layout(self):
 
165
        control = bzrdir.BzrDirMetaFormat1().initialize(self.get_url())
 
166
        control.create_repository()
 
167
        control.create_branch()
 
168
        tree = workingtree.WorkingTreeFormat3().initialize(control)
 
169
        # we want:
 
170
        # format 'Bazaar-NG Working Tree format 3'
 
171
        # inventory = blank inventory
 
172
        # pending-merges = ''
 
173
        # stat-cache = ??
 
174
        # no inventory.basis yet
 
175
        t = control.get_workingtree_transport(None)
 
176
        self.assertEqualDiff('Bazaar-NG Working Tree format 3',
 
177
                             t.get('format').read())
 
178
        self.assertEqualDiff(t.get('inventory').read(), 
 
179
                              '<inventory format="5">\n'
 
180
                              '</inventory>\n',
 
181
                             )
 
182
        self.assertEqualDiff('### bzr hashcache v5\n',
 
183
                             t.get('stat-cache').read())
 
184
        self.assertFalse(t.has('inventory.basis'))
 
185
        # no last-revision file means 'None' or 'NULLREVISION'
 
186
        self.assertFalse(t.has('last-revision'))
 
187
        # TODO RBC 20060210 do a commit, check the inventory.basis is created 
 
188
        # correctly and last-revision file becomes present.
 
189
 
 
190
    def test_uses_lockdir(self):
 
191
        """WorkingTreeFormat3 uses its own LockDir:
 
192
            
 
193
            - lock is a directory
 
194
            - when the WorkingTree is locked, LockDir can see that
 
195
        """
 
196
        t = self.get_transport()
 
197
        url = self.get_url()
 
198
        dir = bzrdir.BzrDirMetaFormat1().initialize(url)
 
199
        repo = dir.create_repository()
 
200
        branch = dir.create_branch()
 
201
        try:
 
202
            tree = workingtree.WorkingTreeFormat3().initialize(dir)
 
203
        except errors.NotLocalUrl:
 
204
            raise TestSkipped('Not a local URL')
 
205
        self.assertIsDirectory('.bzr', t)
 
206
        self.assertIsDirectory('.bzr/checkout', t)
 
207
        self.assertIsDirectory('.bzr/checkout/lock', t)
 
208
        our_lock = LockDir(t, '.bzr/checkout/lock')
 
209
        self.assertEquals(our_lock.peek(), None)
106
210
        tree.lock_write()
107
 
        self.assertEqual(1, tree.branch._lock_count)
108
 
        self.assertEqual('w', tree.branch._lock_mode)
 
211
        self.assertTrue(our_lock.peek())
109
212
        tree.unlock()
110
 
        self.assertEqual(None, tree.branch._lock_count)
111
 
 
112
 
    def get_pullable_branches(self):
113
 
        self.build_tree(['from/', 'from/file', 'to/'])
114
 
        br_a = Branch.initialize('from')
115
 
        tree = br_a.working_tree()
116
 
        tree.add('file')
117
 
        tree.commit('foo', rev_id='A')
118
 
        br_b = Branch.initialize('to')
119
 
        return br_a, br_b
120
 
 
121
 
    def test_pull(self):
122
 
        br_a, br_b = self.get_pullable_branches()
123
 
        br_b.working_tree().pull(br_a)
124
 
        self.failUnless(br_b.has_revision('A'))
125
 
        self.assertEqual(['A'], br_b.revision_history())
126
 
 
127
 
    def test_pull_overwrites(self):
128
 
        br_a, br_b = self.get_pullable_branches()
129
 
        br_b.working_tree().commit('foo', rev_id='B')
130
 
        self.assertEqual(['B'], br_b.revision_history())
131
 
        br_b.working_tree().pull(br_a, overwrite=True)
132
 
        self.failUnless(br_b.has_revision('A'))
133
 
        self.failUnless(br_b.has_revision('B'))
134
 
        self.assertEqual(['A'], br_b.revision_history())
135
 
 
136
 
    def test_revert(self):
137
 
        """Test selected-file revert"""
138
 
        b = Branch.initialize(u'.')
139
 
 
140
 
        self.build_tree(['hello.txt'])
141
 
        file('hello.txt', 'w').write('initial hello')
142
 
 
143
 
        self.assertRaises(NotVersionedError,
144
 
                          b.working_tree().revert, ['hello.txt'])
145
 
        tree = WorkingTree(b.base, b)
146
 
        tree.add(['hello.txt'])
147
 
        tree.commit('create initial hello.txt')
148
 
 
149
 
        self.check_file_contents('hello.txt', 'initial hello')
150
 
        file('hello.txt', 'w').write('new hello')
151
 
        self.check_file_contents('hello.txt', 'new hello')
152
 
 
153
 
        # revert file modified since last revision
154
 
        tree.revert(['hello.txt'])
155
 
        self.check_file_contents('hello.txt', 'initial hello')
156
 
        self.check_file_contents('hello.txt~', 'new hello')
157
 
 
158
 
        # reverting again does not clobber the backup
159
 
        tree.revert(['hello.txt'])
160
 
        self.check_file_contents('hello.txt', 'initial hello')
161
 
        self.check_file_contents('hello.txt~', 'new hello')
162
 
 
163
 
    def test_unknowns(self):
164
 
        b = Branch.initialize(u'.')
165
 
        tree = WorkingTree(u'.', b)
166
 
        self.build_tree(['hello.txt',
167
 
                         'hello.txt~'])
168
 
        self.assertEquals(list(tree.unknowns()),
169
 
                          ['hello.txt'])
170
 
 
 
213
        self.assertEquals(our_lock.peek(), None)
 
214
 
 
215
    def test_missing_pending_merges(self):
 
216
        control = bzrdir.BzrDirMetaFormat1().initialize(self.get_url())
 
217
        control.create_repository()
 
218
        control.create_branch()
 
219
        tree = workingtree.WorkingTreeFormat3().initialize(control)
 
220
        tree._control_files._transport.delete("pending-merges")
 
221
        self.assertEqual([], tree.get_parent_ids())
 
222
 
 
223
 
 
224
class TestFormat2WorkingTree(TestCaseWithTransport):
 
225
    """Tests that are specific to format 2 trees."""
 
226
 
 
227
    def create_format2_tree(self, url):
 
228
        return self.make_branch_and_tree(
 
229
            url, format=bzrdir.BzrDirFormat6())
 
230
 
 
231
    def test_conflicts(self):
 
232
        # test backwards compatability
 
233
        tree = self.create_format2_tree('.')
 
234
        self.assertRaises(errors.UnsupportedOperation, tree.set_conflicts,
 
235
                          None)
 
236
        file('lala.BASE', 'wb').write('labase')
 
237
        expected = conflicts.ContentsConflict('lala')
 
238
        self.assertEqual(list(tree.conflicts()), [expected])
 
239
        file('lala', 'wb').write('la')
 
240
        tree.add('lala', 'lala-id')
 
241
        expected = conflicts.ContentsConflict('lala', file_id='lala-id')
 
242
        self.assertEqual(list(tree.conflicts()), [expected])
 
243
        file('lala.THIS', 'wb').write('lathis')
 
244
        file('lala.OTHER', 'wb').write('laother')
 
245
        # When "text conflict"s happen, stem, THIS and OTHER are text
 
246
        expected = conflicts.TextConflict('lala', file_id='lala-id')
 
247
        self.assertEqual(list(tree.conflicts()), [expected])
 
248
        os.unlink('lala.OTHER')
 
249
        os.mkdir('lala.OTHER')
 
250
        expected = conflicts.ContentsConflict('lala', file_id='lala-id')
 
251
        self.assertEqual(list(tree.conflicts()), [expected])
 
252
 
 
253
 
 
254
class TestNonFormatSpecificCode(TestCaseWithTransport):
 
255
    """This class contains tests of workingtree that are not format specific."""
 
256
 
 
257
    def test_gen_file_id(self):
 
258
        file_id = self.applyDeprecated(zero_thirteen, workingtree.gen_file_id,
 
259
                                      'filename')
 
260
        self.assertStartsWith(file_id, 'filename-')
 
261
 
 
262
    def test_gen_root_id(self):
 
263
        file_id = self.applyDeprecated(zero_thirteen, workingtree.gen_root_id)
 
264
        self.assertStartsWith(file_id, 'tree_root-')
 
265
        
 
266
 
 
267
class InstrumentedTree(object):
 
268
    """A instrumented tree to check the needs_tree_write_lock decorator."""
 
269
 
 
270
    def __init__(self):
 
271
        self._locks = []
 
272
 
 
273
    def lock_tree_write(self):
 
274
        self._locks.append('t')
 
275
 
 
276
    @needs_tree_write_lock
 
277
    def method_with_tree_write_lock(self, *args, **kwargs):
 
278
        """A lock_tree_write decorated method that returns its arguments."""
 
279
        return args, kwargs
 
280
 
 
281
    @needs_tree_write_lock
 
282
    def method_that_raises(self):
 
283
        """This method causes an exception when called with parameters.
 
284
        
 
285
        This allows the decorator code to be checked - it should still call
 
286
        unlock.
 
287
        """
 
288
 
 
289
    def unlock(self):
 
290
        self._locks.append('u')
 
291
 
 
292
 
 
293
class TestInstrumentedTree(TestCase):
 
294
 
 
295
    def test_needs_tree_write_lock(self):
 
296
        """@needs_tree_write_lock should be semantically transparent."""
 
297
        tree = InstrumentedTree()
 
298
        self.assertEqual(
 
299
            'method_with_tree_write_lock',
 
300
            tree.method_with_tree_write_lock.__name__)
 
301
        self.assertEqual(
 
302
            "A lock_tree_write decorated method that returns its arguments.",
 
303
            tree.method_with_tree_write_lock.__doc__)
 
304
        args = (1, 2, 3)
 
305
        kwargs = {'a':'b'}
 
306
        result = tree.method_with_tree_write_lock(1,2,3, a='b')
 
307
        self.assertEqual((args, kwargs), result)
 
308
        self.assertEqual(['t', 'u'], tree._locks)
 
309
        self.assertRaises(TypeError, tree.method_that_raises, 'foo')
 
310
        self.assertEqual(['t', 'u', 't', 'u'], tree._locks)
 
311
 
 
312
 
 
313
class TestRevert(TestCaseWithTransport):
 
314
 
 
315
    def test_revert_conflicts_recursive(self):
 
316
        this_tree = self.make_branch_and_tree('this-tree')
 
317
        self.build_tree_contents([('this-tree/foo/',),
 
318
                                  ('this-tree/foo/bar', 'bar')])
 
319
        this_tree.add(['foo', 'foo/bar'])
 
320
        this_tree.commit('created foo/bar')
 
321
        other_tree = this_tree.bzrdir.sprout('other-tree').open_workingtree()
 
322
        self.build_tree_contents([('other-tree/foo/bar', 'baz')])
 
323
        other_tree.commit('changed bar')
 
324
        self.build_tree_contents([('this-tree/foo/bar', 'qux')])
 
325
        this_tree.commit('changed qux')
 
326
        this_tree.merge_from_branch(other_tree.branch)
 
327
        self.assertEqual(1, len(this_tree.conflicts()))
 
328
        this_tree.revert(['foo'])
 
329
        self.assertEqual(0, len(this_tree.conflicts()))
 
330
 
 
331
 
 
332
class TestAutoResolve(TestCaseWithTransport):
 
333
 
 
334
    def test_auto_resolve(self):
 
335
        base = self.make_branch_and_tree('base')
 
336
        self.build_tree_contents([('base/hello', 'Hello')])
 
337
        base.add('hello', 'hello_id')
 
338
        base.commit('Hello')
 
339
        other = base.bzrdir.sprout('other').open_workingtree()
 
340
        self.build_tree_contents([('other/hello', 'hELLO')])
 
341
        other.commit('Case switch')
 
342
        this = base.bzrdir.sprout('this').open_workingtree()
 
343
        self.failUnlessExists('this/hello')
 
344
        self.build_tree_contents([('this/hello', 'Hello World')])
 
345
        this.commit('Add World')
 
346
        this.merge_from_branch(other.branch)
 
347
        self.assertEqual([conflicts.TextConflict('hello', None, 'hello_id')],
 
348
                         this.conflicts())
 
349
        this.auto_resolve()
 
350
        self.assertEqual([conflicts.TextConflict('hello', None, 'hello_id')],
 
351
                         this.conflicts())
 
352
        self.build_tree_contents([('this/hello', '<<<<<<<')])
 
353
        this.auto_resolve()
 
354
        self.assertEqual([conflicts.TextConflict('hello', None, 'hello_id')],
 
355
                         this.conflicts())
 
356
        self.build_tree_contents([('this/hello', '=======')])
 
357
        this.auto_resolve()
 
358
        self.assertEqual([conflicts.TextConflict('hello', None, 'hello_id')],
 
359
                         this.conflicts())
 
360
        self.build_tree_contents([('this/hello', '\n>>>>>>>')])
 
361
        remaining, resolved = this.auto_resolve()
 
362
        self.assertEqual([conflicts.TextConflict('hello', None, 'hello_id')],
 
363
                         this.conflicts())
 
364
        self.assertEqual([], resolved)
 
365
        self.build_tree_contents([('this/hello', 'hELLO wORLD')])
 
366
        remaining, resolved = this.auto_resolve()
 
367
        self.assertEqual([], this.conflicts())
 
368
        self.assertEqual([conflicts.TextConflict('hello', None, 'hello_id')],
 
369
                         resolved)
 
370
        self.failIfExists('this/hello.BASE')
 
371
 
 
372
    def test_auto_resolve_dir(self):
 
373
        tree = self.make_branch_and_tree('tree')
 
374
        self.build_tree(['tree/hello/'])
 
375
        tree.add('hello', 'hello-id')
 
376
        file_conflict = conflicts.TextConflict('file', None, 'hello-id')
 
377
        tree.set_conflicts(conflicts.ConflictList([file_conflict]))
 
378
        tree.auto_resolve()
 
379
 
 
380
 
 
381
class TestFindTrees(TestCaseWithTransport):
 
382
 
 
383
    def test_find_trees(self):
 
384
        self.make_branch_and_tree('foo')
 
385
        self.make_branch_and_tree('foo/bar')
 
386
        # Sticking a tree inside a control dir is heinous, so let's skip it
 
387
        self.make_branch_and_tree('foo/.bzr/baz')
 
388
        self.make_branch('qux')
 
389
        trees = workingtree.WorkingTree.find_trees('.')
 
390
        self.assertEqual(2, len(list(trees)))