1
# Copyright (C) 2007-2010 Canonical Ltd
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.
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.
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
17
"""Tests for Branch.revision_history and last_revision."""
22
revision as _mod_revision,
24
from bzrlib.symbol_versioning import deprecated_in
25
from bzrlib.tests import per_branch
28
class TestLastRevision(per_branch.TestCaseWithBranch):
29
"""Tests for the last_revision property of the branch.
32
def test_set_last_revision_info(self):
33
# based on TestBranch.test_append_revisions, which uses the old
35
wt = self.make_branch_and_tree('tree')
36
wt.commit('f', rev_id='rev1')
37
wt.commit('f', rev_id='rev2')
38
wt.commit('f', rev_id='rev3')
39
br = self.get_branch()
41
br.set_last_revision_info(1, 'rev1')
42
self.assertEquals(br.revision_history(), ["rev1",])
43
br.set_last_revision_info(3, 'rev3')
44
self.assertEquals(br.revision_history(), ["rev1", "rev2", "rev3"])
45
# append_revision specifically prohibits some ids;
46
# set_last_revision_info currently does not
47
## self.assertRaises(errors.ReservedId,
48
## br.set_last_revision_info, 4, 'current:')
51
class TestRevisionHistoryCaching(per_branch.TestCaseWithBranch):
52
"""Tests for the caching of branches' revision_history.
54
When locked, branches should avoid regenerating or rereading
55
revision_history by caching the last value of it. This is safe because
56
the branch is locked, so nothing can change the revision_history
59
When not locked, obviously the revision_history will need to be regenerated
62
We test if revision_history is using the cache by instrumenting the branch's
63
_gen_revision_history method, which is called by Branch.revision_history if
64
the branch does not have a cache of the revision history.
67
def get_instrumented_branch(self):
68
"""Get a branch and monkey patch it to log calls to
69
_gen_revision_history.
71
:returns: a tuple of (the branch, list that calls will be logged to)
73
branch = self.get_branch()
75
real_gen_revision_history = branch._gen_revision_history
76
def fake_gen_revision_history():
77
calls.append('_gen_revision_history')
78
return real_gen_revision_history()
79
branch._gen_revision_history = fake_gen_revision_history
82
def test_revision_history_when_unlocked(self):
83
"""Repeated calls to revision history will call _gen_revision_history
84
each time when the branch is not locked.
86
branch, calls = self.get_instrumented_branch()
87
# Repeatedly call revision_history.
88
branch.revision_history()
89
branch.revision_history()
91
['_gen_revision_history', '_gen_revision_history'], calls)
93
def test_revision_history_when_locked(self):
94
"""Repeated calls to revision history will only call
95
_gen_revision_history once while the branch is locked.
97
branch, calls = self.get_instrumented_branch()
98
# Lock the branch, then repeatedly call revision_history.
101
branch.revision_history()
102
branch.revision_history()
103
self.assertEqual(['_gen_revision_history'], calls)
107
def test_set_revision_history_when_locked(self):
108
"""When the branch is locked, calling set_revision_history should cache
109
the revision history so that a later call to revision_history will not
110
need to call _gen_revision_history.
112
branch, calls = self.get_instrumented_branch()
113
# Lock the branch, set the revision history, then repeatedly call
116
self.applyDeprecated(deprecated_in((2, 4, 0)),
117
branch.set_revision_history, [])
119
branch.revision_history()
120
self.assertEqual([], calls)
124
def test_set_revision_history_when_unlocked(self):
125
"""When the branch is not locked, calling set_revision_history will not
126
cause the revision history to be cached.
128
branch, calls = self.get_instrumented_branch()
129
self.applyDeprecated(deprecated_in((2, 4, 0)),
130
branch.set_revision_history, [])
131
branch.revision_history()
132
self.assertEqual(['_gen_revision_history'], calls)
134
def test_set_last_revision_info_when_locked(self):
135
"""When the branch is locked, calling set_last_revision_info should
136
cache the last revision info so that a later call to last_revision_info
137
will not need the revision_history. Thus the branch will not to call
138
_gen_revision_history in this situation.
140
a_branch, calls = self.get_instrumented_branch()
141
# Lock the branch, set the last revision info, then call
142
# last_revision_info.
143
a_branch.lock_write()
144
a_branch.set_last_revision_info(0, _mod_revision.NULL_REVISION)
147
a_branch.last_revision_info()
148
self.assertEqual([], calls)
152
def test_set_last_revision_info_none(self):
153
"""Passing None to set_last_revision_info raises an exception."""
154
a_branch = self.get_branch()
155
# Lock the branch, set the last revision info, then call
156
# last_revision_info.
157
a_branch.lock_write()
158
self.addCleanup(a_branch.unlock)
159
self.assertRaises(errors.InvalidRevisionId,
160
a_branch.set_last_revision_info, 0, None)
162
def test_set_last_revision_info_uncaches_revision_history_for_format6(self):
163
"""On format 6 branches, set_last_revision_info invalidates the revision
166
if not isinstance(self.branch_format, branch.BzrBranchFormat6):
168
a_branch, calls = self.get_instrumented_branch()
169
# Lock the branch, cache the revision history.
170
a_branch.lock_write()
171
a_branch.revision_history()
172
# Set the last revision info, clearing the cache.
173
a_branch.set_last_revision_info(0, _mod_revision.NULL_REVISION)
176
a_branch.revision_history()
177
self.assertEqual(['_gen_revision_history'], calls)
181
def test_cached_revision_history_not_accidentally_mutable(self):
182
"""When there's a cached version of the history, revision_history
183
returns a copy of the cached data so that callers cannot accidentally
186
branch = self.get_branch()
187
# Lock the branch, then repeatedly call revision_history, mutating the
191
# The first time the data returned will not be in the cache.
192
history = branch.revision_history()
193
history.append('one')
194
# The second time the data comes from the cache.
195
history = branch.revision_history()
196
history.append('two')
197
# The revision_history() should still be unchanged, even though
198
# we've mutated the return values from earlier calls.
199
self.assertEqual([], branch.revision_history())
204
class TestRevisionHistory(per_branch.TestCaseWithBranch):
206
def test_parent_ghost(self):
207
tree = self.make_branch_and_tree('tree')
208
tree.add_parent_tree_id('ghost-revision',
209
allow_leftmost_as_ghost=True)
210
tree.commit('first non-ghost commit', rev_id='non-ghost-revision')
211
self.assertEqual(['non-ghost-revision'],
212
tree.branch.revision_history())