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Viewing changes to breezy/tests/test_branchbuilder.py

  • Committer: John Arbash Meinel
  • Date: 2006-04-25 15:05:42 UTC
  • mfrom: (1185.85.85 bzr-encoding)
  • mto: This revision was merged to the branch mainline in revision 1752.
  • Revision ID: john@arbash-meinel.com-20060425150542-c7b518dca9928691
[merge] the old bzr-encoding changes, reparenting them on bzr.dev

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1
 
# Copyright (C) 2007-2011 Canonical Ltd
2
 
#
3
 
# This program is free software; you can redistribute it and/or modify
4
 
# it under the terms of the GNU General Public License as published by
5
 
# the Free Software Foundation; either version 2 of the License, or
6
 
# (at your option) any later version.
7
 
#
8
 
# This program is distributed in the hope that it will be useful,
9
 
# but WITHOUT ANY WARRANTY; without even the implied warranty of
10
 
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11
 
# GNU General Public License for more details.
12
 
#
13
 
# You should have received a copy of the GNU General Public License
14
 
# along with this program; if not, write to the Free Software
15
 
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
16
 
 
17
 
"""Tests for the BranchBuilder class."""
18
 
 
19
 
from .. import (
20
 
    branch as _mod_branch,
21
 
    revision as _mod_revision,
22
 
    tests,
23
 
    )
24
 
from ..bzr import (
25
 
    branch as _mod_bzrbranch,
26
 
    )
27
 
from ..branchbuilder import BranchBuilder
28
 
 
29
 
 
30
 
class TestBranchBuilder(tests.TestCaseWithMemoryTransport):
31
 
 
32
 
    def test_create(self):
33
 
        """Test the constructor api."""
34
 
        builder = BranchBuilder(self.get_transport().clone('foo'))
35
 
        # we dont care if the branch has been built or not at this point.
36
 
 
37
 
    def test_get_branch(self):
38
 
        """get_branch returns the created branch."""
39
 
        builder = BranchBuilder(self.get_transport().clone('foo'))
40
 
        branch = builder.get_branch()
41
 
        self.assertIsInstance(branch, _mod_branch.Branch)
42
 
        self.assertEqual(self.get_transport().clone('foo').base,
43
 
                         branch.base)
44
 
        self.assertEqual(
45
 
            (0, _mod_revision.NULL_REVISION),
46
 
            branch.last_revision_info())
47
 
 
48
 
    def test_format(self):
49
 
        """Making a BranchBuilder with a format option sets the branch type."""
50
 
        builder = BranchBuilder(self.get_transport(), format='dirstate-tags')
51
 
        branch = builder.get_branch()
52
 
        self.assertIsInstance(branch, _mod_bzrbranch.BzrBranch6)
53
 
 
54
 
    def test_build_one_commit(self):
55
 
        """doing build_commit causes a commit to happen."""
56
 
        builder = BranchBuilder(self.get_transport().clone('foo'))
57
 
        rev_id = builder.build_commit()
58
 
        branch = builder.get_branch()
59
 
        self.assertEqual((1, rev_id), branch.last_revision_info())
60
 
        self.assertEqual(
61
 
            'commit 1',
62
 
            branch.repository.get_revision(branch.last_revision()).message)
63
 
 
64
 
    def test_build_commit_timestamp(self):
65
 
        """You can set a date when committing."""
66
 
        builder = self.make_branch_builder('foo')
67
 
        rev_id = builder.build_commit(timestamp=1236043340)
68
 
        branch = builder.get_branch()
69
 
        self.assertEqual((1, rev_id), branch.last_revision_info())
70
 
        rev = branch.repository.get_revision(branch.last_revision())
71
 
        self.assertEqual(
72
 
            'commit 1',
73
 
            rev.message)
74
 
        self.assertEqual(
75
 
            1236043340,
76
 
            int(rev.timestamp))
77
 
 
78
 
    def test_build_two_commits(self):
79
 
        """The second commit has the right parents and message."""
80
 
        builder = BranchBuilder(self.get_transport().clone('foo'))
81
 
        rev_id1 = builder.build_commit()
82
 
        rev_id2 = builder.build_commit()
83
 
        branch = builder.get_branch()
84
 
        self.assertEqual((2, rev_id2), branch.last_revision_info())
85
 
        self.assertEqual(
86
 
            'commit 2',
87
 
            branch.repository.get_revision(branch.last_revision()).message)
88
 
        self.assertEqual(
89
 
            [rev_id1],
90
 
            branch.repository.get_revision(branch.last_revision()).parent_ids)
91
 
 
92
 
    def test_build_commit_parent_ids(self):
93
 
        """build_commit() takes a parent_ids argument."""
94
 
        builder = BranchBuilder(self.get_transport().clone('foo'))
95
 
        rev_id1 = builder.build_commit(
96
 
            parent_ids=[b"ghost"], allow_leftmost_as_ghost=True)
97
 
        rev_id2 = builder.build_commit(parent_ids=[])
98
 
        branch = builder.get_branch()
99
 
        self.assertEqual((1, rev_id2), branch.last_revision_info())
100
 
        self.assertEqual(
101
 
            [b"ghost"],
102
 
            branch.repository.get_revision(rev_id1).parent_ids)
103
 
 
104
 
 
105
 
class TestBranchBuilderBuildSnapshot(tests.TestCaseWithMemoryTransport):
106
 
 
107
 
    def assertTreeShape(self, expected_shape, tree):
108
 
        """Check that the tree shape matches expectations."""
109
 
        tree.lock_read()
110
 
        try:
111
 
            entries = [(path, ie.file_id, ie.kind)
112
 
                       for path, ie in tree.iter_entries_by_dir()]
113
 
        finally:
114
 
            tree.unlock()
115
 
        self.assertEqual(expected_shape, entries)
116
 
 
117
 
    def build_a_rev(self):
118
 
        builder = BranchBuilder(self.get_transport().clone('foo'))
119
 
        rev_id1 = builder.build_snapshot(None,
120
 
                                         [('add', ('', b'a-root-id', 'directory', None)),
121
 
                                          ('add', ('a', b'a-id', 'file', b'contents'))],
122
 
                                         revision_id=b'A-id')
123
 
        self.assertEqual(b'A-id', rev_id1)
124
 
        return builder
125
 
 
126
 
    def test_add_one_file(self):
127
 
        builder = self.build_a_rev()
128
 
        branch = builder.get_branch()
129
 
        self.assertEqual((1, b'A-id'), branch.last_revision_info())
130
 
        rev_tree = branch.repository.revision_tree(b'A-id')
131
 
        rev_tree.lock_read()
132
 
        self.addCleanup(rev_tree.unlock)
133
 
        self.assertTreeShape([(u'', b'a-root-id', 'directory'),
134
 
                              (u'a', b'a-id', 'file')], rev_tree)
135
 
        self.assertEqual(b'contents', rev_tree.get_file_text('a'))
136
 
 
137
 
    def test_add_second_file(self):
138
 
        builder = self.build_a_rev()
139
 
        rev_id2 = builder.build_snapshot(None,
140
 
                                         [('add', ('b', b'b-id', 'file', b'content_b'))],
141
 
                                         revision_id=b'B-id')
142
 
        self.assertEqual(b'B-id', rev_id2)
143
 
        branch = builder.get_branch()
144
 
        self.assertEqual((2, rev_id2), branch.last_revision_info())
145
 
        rev_tree = branch.repository.revision_tree(rev_id2)
146
 
        rev_tree.lock_read()
147
 
        self.addCleanup(rev_tree.unlock)
148
 
        self.assertTreeShape([(u'', b'a-root-id', 'directory'),
149
 
                              (u'a', b'a-id', 'file'),
150
 
                              (u'b', b'b-id', 'file')], rev_tree)
151
 
        self.assertEqual(b'content_b', rev_tree.get_file_text('b'))
152
 
 
153
 
    def test_add_empty_dir(self):
154
 
        builder = self.build_a_rev()
155
 
        rev_id2 = builder.build_snapshot(None,
156
 
                                         [('add', ('b', b'b-id', 'directory', None))],
157
 
                                         revision_id=b'B-id')
158
 
        rev_tree = builder.get_branch().repository.revision_tree(b'B-id')
159
 
        self.assertTreeShape([(u'', b'a-root-id', 'directory'),
160
 
                              (u'a', b'a-id', 'file'),
161
 
                              (u'b', b'b-id', 'directory'),
162
 
                              ], rev_tree)
163
 
 
164
 
    def test_commit_timestamp(self):
165
 
        builder = self.make_branch_builder('foo')
166
 
        rev_id = builder.build_snapshot(None,
167
 
                                        [('add', (u'', None, 'directory', None))],
168
 
                                        timestamp=1234567890)
169
 
        rev = builder.get_branch().repository.get_revision(rev_id)
170
 
        self.assertEqual(
171
 
            1234567890,
172
 
            int(rev.timestamp))
173
 
 
174
 
    def test_commit_message_default(self):
175
 
        builder = BranchBuilder(self.get_transport().clone('foo'))
176
 
        rev_id = builder.build_snapshot(None,
177
 
                                        [('add', (u'', None, 'directory', None))])
178
 
        branch = builder.get_branch()
179
 
        rev = branch.repository.get_revision(rev_id)
180
 
        self.assertEqual(u'commit 1', rev.message)
181
 
 
182
 
    def test_commit_message_supplied(self):
183
 
        builder = BranchBuilder(self.get_transport().clone('foo'))
184
 
        rev_id = builder.build_snapshot(None,
185
 
                                        [('add', (u'', None, 'directory', None))],
186
 
                                        message=u'Foo')
187
 
        branch = builder.get_branch()
188
 
        rev = branch.repository.get_revision(rev_id)
189
 
        self.assertEqual(u'Foo', rev.message)
190
 
 
191
 
    def test_commit_message_callback(self):
192
 
        builder = BranchBuilder(self.get_transport().clone('foo'))
193
 
        rev_id = builder.build_snapshot(None,
194
 
                                        [('add', (u'', None, 'directory', None))],
195
 
                                        message_callback=lambda x: u'Foo')
196
 
        branch = builder.get_branch()
197
 
        rev = branch.repository.get_revision(rev_id)
198
 
        self.assertEqual(u'Foo', rev.message)
199
 
 
200
 
    def test_modify_file(self):
201
 
        builder = self.build_a_rev()
202
 
        rev_id2 = builder.build_snapshot(None,
203
 
                                         [('modify', ('a', b'new\ncontent\n'))],
204
 
                                         revision_id=b'B-id')
205
 
        self.assertEqual(b'B-id', rev_id2)
206
 
        branch = builder.get_branch()
207
 
        rev_tree = branch.repository.revision_tree(rev_id2)
208
 
        rev_tree.lock_read()
209
 
        self.addCleanup(rev_tree.unlock)
210
 
        self.assertEqual(b'new\ncontent\n',
211
 
                         rev_tree.get_file_text('a'))
212
 
 
213
 
    def test_delete_file(self):
214
 
        builder = self.build_a_rev()
215
 
        rev_id2 = builder.build_snapshot(None,
216
 
                                         [('unversion', 'a')], revision_id=b'B-id')
217
 
        self.assertEqual(b'B-id', rev_id2)
218
 
        branch = builder.get_branch()
219
 
        rev_tree = branch.repository.revision_tree(rev_id2)
220
 
        rev_tree.lock_read()
221
 
        self.addCleanup(rev_tree.unlock)
222
 
        self.assertTreeShape([(u'', b'a-root-id', 'directory')], rev_tree)
223
 
 
224
 
    def test_delete_directory(self):
225
 
        builder = self.build_a_rev()
226
 
        rev_id2 = builder.build_snapshot(None,
227
 
                                         [('add', ('b', b'b-id', 'directory', None)),
228
 
                                          ('add', ('b/c', b'c-id', 'file', b'foo\n')),
229
 
                                             ('add', ('b/d', b'd-id',
230
 
                                                      'directory', None)),
231
 
                                             ('add', ('b/d/e', b'e-id',
232
 
                                                      'file', b'eff\n')),
233
 
                                          ], revision_id=b'B-id')
234
 
        rev_tree = builder.get_branch().repository.revision_tree(b'B-id')
235
 
        self.assertTreeShape([(u'', b'a-root-id', 'directory'),
236
 
                              (u'a', b'a-id', 'file'),
237
 
                              (u'b', b'b-id', 'directory'),
238
 
                              (u'b/c', b'c-id', 'file'),
239
 
                              (u'b/d', b'd-id', 'directory'),
240
 
                              (u'b/d/e', b'e-id', 'file')], rev_tree)
241
 
        # Removing a directory removes all child dirs
242
 
        builder.build_snapshot(
243
 
            None, [('unversion', 'b')],
244
 
            revision_id=b'C-id')
245
 
        rev_tree = builder.get_branch().repository.revision_tree(b'C-id')
246
 
        self.assertTreeShape([(u'', b'a-root-id', 'directory'),
247
 
                              (u'a', b'a-id', 'file'),
248
 
                              ], rev_tree)
249
 
 
250
 
    def test_unknown_action(self):
251
 
        builder = self.build_a_rev()
252
 
        e = self.assertRaises(ValueError,
253
 
                              builder.build_snapshot, None, [
254
 
                                  ('weirdo', ('foo',))],
255
 
                              revision_id=b'B-id')
256
 
        self.assertEqual('Unknown build action: "weirdo"', str(e))
257
 
 
258
 
    def test_rename(self):
259
 
        builder = self.build_a_rev()
260
 
        builder.build_snapshot(None,
261
 
                               [('rename', ('a', 'b'))], revision_id=b'B-id')
262
 
        rev_tree = builder.get_branch().repository.revision_tree(b'B-id')
263
 
        self.assertTreeShape([(u'', b'a-root-id', 'directory'),
264
 
                              (u'b', b'a-id', 'file')], rev_tree)
265
 
 
266
 
    def test_rename_into_subdir(self):
267
 
        builder = self.build_a_rev()
268
 
        builder.build_snapshot(None,
269
 
                               [('add', ('dir', b'dir-id', 'directory', None)),
270
 
                                ('rename', ('a', 'dir/a'))], revision_id=b'B-id')
271
 
        rev_tree = builder.get_branch().repository.revision_tree(b'B-id')
272
 
        self.assertTreeShape([(u'', b'a-root-id', 'directory'),
273
 
                              (u'dir', b'dir-id', 'directory'),
274
 
                              (u'dir/a', b'a-id', 'file')], rev_tree)
275
 
 
276
 
    def test_rename_out_of_unversioned_subdir(self):
277
 
        builder = self.build_a_rev()
278
 
        builder.build_snapshot(None,
279
 
                               [('add', ('dir', b'dir-id', 'directory', None)),
280
 
                                ('rename', ('a', 'dir/a'))],
281
 
                               revision_id=b'B-id')
282
 
        builder.build_snapshot(None,
283
 
                               [('rename', ('dir/a', 'a')),
284
 
                                ('unversion', 'dir')], revision_id=b'C-id')
285
 
        rev_tree = builder.get_branch().repository.revision_tree(b'C-id')
286
 
        self.assertTreeShape([(u'', b'a-root-id', 'directory'),
287
 
                              (u'a', b'a-id', 'file')], rev_tree)
288
 
 
289
 
    def test_set_parent(self):
290
 
        builder = self.build_a_rev()
291
 
        builder.start_series()
292
 
        self.addCleanup(builder.finish_series)
293
 
        builder.build_snapshot([b'A-id'],
294
 
                               [('modify', ('a', b'new\ncontent\n'))],
295
 
                               revision_id=b'B-id')
296
 
        builder.build_snapshot([b'A-id'],
297
 
                               [('add', ('c', b'c-id', 'file', b'alt\ncontent\n'))],
298
 
                               revision_id=b'C-id')
299
 
        # We should now have a graph:
300
 
        #   A
301
 
        #   |\
302
 
        #   C B
303
 
        # And not A => B => C
304
 
        repo = builder.get_branch().repository
305
 
        self.assertEqual({b'B-id': (b'A-id',), b'C-id': (b'A-id',)},
306
 
                         repo.get_parent_map([b'B-id', b'C-id']))
307
 
        b_tree = repo.revision_tree(b'B-id')
308
 
        self.assertTreeShape([(u'', b'a-root-id', 'directory'),
309
 
                              (u'a', b'a-id', 'file'),
310
 
                              ], b_tree)
311
 
        self.assertEqual(b'new\ncontent\n', b_tree.get_file_text('a'))
312
 
 
313
 
        # We should still be using the content from A in C, not from B
314
 
        c_tree = repo.revision_tree(b'C-id')
315
 
        self.assertTreeShape([(u'', b'a-root-id', 'directory'),
316
 
                              (u'a', b'a-id', 'file'),
317
 
                              (u'c', b'c-id', 'file'),
318
 
                              ], c_tree)
319
 
        self.assertEqual(b'contents', c_tree.get_file_text('a'))
320
 
        self.assertEqual(b'alt\ncontent\n', c_tree.get_file_text('c'))
321
 
 
322
 
    def test_set_merge_parent(self):
323
 
        builder = self.build_a_rev()
324
 
        builder.start_series()
325
 
        self.addCleanup(builder.finish_series)
326
 
        builder.build_snapshot([b'A-id'],
327
 
                               [('add', ('b', b'b-id', 'file', b'b\ncontent\n'))],
328
 
                               revision_id=b'B-id')
329
 
        builder.build_snapshot([b'A-id'],
330
 
                               [('add', ('c', b'c-id', 'file', b'alt\ncontent\n'))],
331
 
                               revision_id=b'C-id')
332
 
        builder.build_snapshot([b'B-id', b'C-id'], [], revision_id=b'D-id')
333
 
        repo = builder.get_branch().repository
334
 
        self.assertEqual({b'B-id': (b'A-id',), b'C-id': (b'A-id',),
335
 
                          b'D-id': (b'B-id', b'C-id')},
336
 
                         repo.get_parent_map([b'B-id', b'C-id', b'D-id']))
337
 
        d_tree = repo.revision_tree(b'D-id')
338
 
        # Note: by default a merge node does *not* pull in the changes from the
339
 
        #       merged tree, you have to supply it yourself.
340
 
        self.assertTreeShape([(u'', b'a-root-id', 'directory'),
341
 
                              (u'a', b'a-id', 'file'),
342
 
                              (u'b', b'b-id', 'file'),
343
 
                              ], d_tree)
344
 
 
345
 
    def test_set_merge_parent_and_contents(self):
346
 
        builder = self.build_a_rev()
347
 
        builder.start_series()
348
 
        self.addCleanup(builder.finish_series)
349
 
        builder.build_snapshot([b'A-id'],
350
 
                               [('add', ('b', b'b-id', 'file', b'b\ncontent\n'))],
351
 
                               revision_id=b'B-id')
352
 
        builder.build_snapshot([b'A-id'],
353
 
                               [('add', ('c', b'c-id', 'file', b'alt\ncontent\n'))],
354
 
                               revision_id=b'C-id')
355
 
        builder.build_snapshot([b'B-id', b'C-id'],
356
 
                               [('add', ('c', b'c-id', 'file', b'alt\ncontent\n'))],
357
 
                               revision_id=b'D-id')
358
 
        repo = builder.get_branch().repository
359
 
        self.assertEqual({b'B-id': (b'A-id',), b'C-id': (b'A-id',),
360
 
                          b'D-id': (b'B-id', b'C-id')},
361
 
                         repo.get_parent_map([b'B-id', b'C-id', b'D-id']))
362
 
        d_tree = repo.revision_tree(b'D-id')
363
 
        self.assertTreeShape([(u'', b'a-root-id', 'directory'),
364
 
                              (u'a', b'a-id', 'file'),
365
 
                              (u'b', b'b-id', 'file'),
366
 
                              (u'c', b'c-id', 'file'),
367
 
                              ], d_tree)
368
 
        # Because we copied the exact text into *this* tree, the 'c' file
369
 
        # should look like it was not modified in the merge
370
 
        self.assertEqual(b'C-id', d_tree.get_file_revision('c'))
371
 
 
372
 
    def test_set_parent_to_null(self):
373
 
        builder = self.build_a_rev()
374
 
        builder.start_series()
375
 
        self.addCleanup(builder.finish_series)
376
 
        builder.build_snapshot([],
377
 
                               [('add', ('', None, 'directory', None))],
378
 
                               revision_id=b'B-id')
379
 
        # We should now have a graph:
380
 
        #   A B
381
 
        # And not A => B
382
 
        repo = builder.get_branch().repository
383
 
        self.assertEqual({b'A-id': (_mod_revision.NULL_REVISION,),
384
 
                          b'B-id': (_mod_revision.NULL_REVISION,), },
385
 
                         repo.get_parent_map([b'A-id', b'B-id']))
386
 
 
387
 
    def test_start_finish_series(self):
388
 
        builder = BranchBuilder(self.get_transport().clone('foo'))
389
 
        builder.start_series()
390
 
        try:
391
 
            self.assertIsNot(None, builder._tree)
392
 
            self.assertEqual('w', builder._tree._lock_mode)
393
 
            self.assertTrue(builder._branch.is_locked())
394
 
        finally:
395
 
            builder.finish_series()
396
 
        self.assertIs(None, builder._tree)
397
 
        self.assertFalse(builder._branch.is_locked())
398
 
 
399
 
    def test_ghost_mainline_history(self):
400
 
        builder = BranchBuilder(self.get_transport().clone('foo'))
401
 
        builder.start_series()
402
 
        try:
403
 
            builder.build_snapshot([b'ghost'],
404
 
                                   [('add', ('', b'ROOT_ID', 'directory', ''))],
405
 
                                   allow_leftmost_as_ghost=True, revision_id=b'tip')
406
 
        finally:
407
 
            builder.finish_series()
408
 
        b = builder.get_branch()
409
 
        b.lock_read()
410
 
        self.addCleanup(b.unlock)
411
 
        self.assertEqual((b'ghost',),
412
 
                         b.repository.get_graph().get_parent_map([b'tip'])[b'tip'])
413
 
 
414
 
    def test_unversion_root_add_new_root(self):
415
 
        builder = BranchBuilder(self.get_transport().clone('foo'))
416
 
        builder.start_series()
417
 
        builder.build_snapshot(None,
418
 
                               [('add', ('', b'TREE_ROOT', 'directory', ''))],
419
 
                               revision_id=b'rev-1')
420
 
        builder.build_snapshot(None,
421
 
                               [('unversion', ''),
422
 
                                ('add', ('', b'my-root', 'directory', ''))],
423
 
                               revision_id=b'rev-2')
424
 
        builder.finish_series()
425
 
        rev_tree = builder.get_branch().repository.revision_tree(b'rev-2')
426
 
        self.assertTreeShape([(u'', b'my-root', 'directory')], rev_tree)
427
 
 
428
 
    def test_empty_flush(self):
429
 
        """A flush with no actions before it is a no-op."""
430
 
        builder = BranchBuilder(self.get_transport().clone('foo'))
431
 
        builder.start_series()
432
 
        builder.build_snapshot(None,
433
 
                               [('add', ('', b'TREE_ROOT', 'directory', ''))],
434
 
                               revision_id=b'rev-1')
435
 
        builder.build_snapshot(None, [('flush', None)], revision_id=b'rev-2')
436
 
        builder.finish_series()
437
 
        rev_tree = builder.get_branch().repository.revision_tree(b'rev-2')
438
 
        self.assertTreeShape([(u'', b'TREE_ROOT', 'directory')], rev_tree)
439
 
 
440
 
    def test_kind_change(self):
441
 
        """It's possible to change the kind of an entry in a single snapshot
442
 
        with a bit of help from the 'flush' action.
443
 
        """
444
 
        builder = BranchBuilder(self.get_transport().clone('foo'))
445
 
        builder.start_series()
446
 
        builder.build_snapshot(None,
447
 
                               [('add', (u'', b'a-root-id', 'directory', None)),
448
 
                                ('add', (u'a', b'a-id', 'file', b'content\n'))],
449
 
                               revision_id=b'A-id')
450
 
        builder.build_snapshot(None,
451
 
                               [('unversion', 'a'),
452
 
                                ('flush', None),
453
 
                                   ('add', (u'a', b'a-id', 'directory', None))],
454
 
                               revision_id=b'B-id')
455
 
        builder.finish_series()
456
 
        rev_tree = builder.get_branch().repository.revision_tree(b'B-id')
457
 
        self.assertTreeShape(
458
 
            [(u'', b'a-root-id', 'directory'), (u'a', b'a-id', 'directory')],
459
 
            rev_tree)
460
 
 
461
 
    def test_pivot_root(self):
462
 
        """It's possible (albeit awkward) to move an existing dir to the root
463
 
        in a single snapshot by using unversion then flush then add.
464
 
        """
465
 
        builder = BranchBuilder(self.get_transport().clone('foo'))
466
 
        builder.start_series()
467
 
        builder.build_snapshot(None,
468
 
                               [('add', (u'', b'orig-root', 'directory', None)),
469
 
                                ('add', (u'dir', b'dir-id', 'directory', None))],
470
 
                               revision_id=b'A-id')
471
 
        builder.build_snapshot(None,
472
 
                               [('unversion', ''),  # implicitly unversions all children
473
 
                                ('flush', None),
474
 
                                   ('add', (u'', b'dir-id', 'directory', None))],
475
 
                               revision_id=b'B-id')
476
 
        builder.finish_series()
477
 
        rev_tree = builder.get_branch().repository.revision_tree(b'B-id')
478
 
        self.assertTreeShape([(u'', b'dir-id', 'directory')], rev_tree)