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Viewing changes to bzrlib/tests/blackbox/test_diff.py

  • Committer: Aaron Bentley
  • Date: 2006-06-21 21:35:06 UTC
  • mfrom: (1803 +trunk)
  • mto: This revision was merged to the branch mainline in revision 1804.
  • Revision ID: abentley@panoramicfeedback.com-20060621213506-e58c1f9dc1a6d6d2
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bzrlib/tests/blackbox/test_diff.py
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# Copyright (C) 2006-2010 Canonical Ltd
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#
 
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# Copyright (C) 2005, 2006 by Canonical Ltd
 
2
 
3
3
# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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6
# (at your option) any later version.
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#
 
7
 
8
8
# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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10
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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11
# GNU General Public License for more details.
12
 
#
 
12
 
13
13
# You should have received a copy of the GNU General Public License
14
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
 
15
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
16
16
 
17
17
 
18
18
"""Black-box tests for bzr diff.
21
21
import os
22
22
import re
23
23
 
24
 
from bzrlib import (
25
 
    tests,
26
 
    workingtree,
27
 
    )
28
 
from bzrlib.diff import (
29
 
    DiffTree,
30
 
    format_registry as diff_format_registry,
31
 
    )
32
 
from bzrlib.tests import (
33
 
    features,
34
 
    )
 
24
import bzrlib
 
25
from bzrlib.branch import Branch
 
26
from bzrlib.tests.blackbox import ExternalBase
35
27
 
36
28
 
37
29
def subst_dates(string):
40
32
                  'YYYY-MM-DD HH:MM:SS +ZZZZ', string)
41
33
 
42
34
 
43
 
class DiffBase(tests.TestCaseWithTransport):
44
 
    """Base class with common setup method"""
45
 
 
46
 
    def make_example_branch(self):
47
 
        tree = self.make_branch_and_tree('.')
48
 
        self.build_tree_contents([
49
 
            ('hello', 'foo\n'),
50
 
            ('goodbye', 'baz\n')])
51
 
        tree.add(['hello'])
52
 
        tree.commit('setup')
53
 
        tree.add(['goodbye'])
54
 
        tree.commit('setup')
55
 
        return tree
56
 
 
57
 
 
58
 
class TestDiff(DiffBase):
 
35
class TestDiff(ExternalBase):
 
36
 
 
37
    def make_example_branch(test):
 
38
        # FIXME: copied from test_too_much -- share elsewhere?
 
39
        test.runbzr('init')
 
40
        file('hello', 'wt').write('foo\n')
 
41
        test.runbzr('add hello')
 
42
        test.runbzr('commit -m setup hello')
 
43
        file('goodbye', 'wt').write('baz\n')
 
44
        test.runbzr('add goodbye')
 
45
        test.runbzr('commit -m setup goodbye')
59
46
 
60
47
    def test_diff(self):
61
 
        tree = self.make_example_branch()
62
 
        self.build_tree_contents([('hello', 'hello world!')])
63
 
        tree.commit(message='fixing hello')
64
 
        output = self.run_bzr('diff -r 2..3', retcode=1)[0]
65
 
        self.assert_('\n+hello world!' in output)
66
 
        output = self.run_bzr('diff -c 3', retcode=1)[0]
67
 
        self.assert_('\n+hello world!' in output)
68
 
        output = self.run_bzr('diff -r last:3..last:1', retcode=1)[0]
69
 
        self.assert_('\n+baz' in output)
70
 
        output = self.run_bzr('diff -c last:2', retcode=1)[0]
71
 
        self.assert_('\n+baz' in output)
72
 
        self.build_tree(['moo'])
73
 
        tree.add('moo')
 
48
        self.make_example_branch()
 
49
        file('hello', 'wt').write('hello world!')
 
50
        self.runbzr('commit -m fixing hello')
 
51
        output = self.runbzr('diff -r 2..3', backtick=1, retcode=1)
 
52
        self.assert_('\n+hello world!' in output)
 
53
        output = self.runbzr('diff -r last:3..last:1', backtick=1, retcode=1)
 
54
        self.assert_('\n+baz' in output)
 
55
        file('moo', 'wb').write('moo')
 
56
        self.runbzr('add moo')
74
57
        os.unlink('moo')
75
 
        self.run_bzr('diff')
 
58
        self.runbzr('diff')
76
59
 
77
60
    def test_diff_prefix(self):
78
61
        """diff --prefix appends to filenames in output"""
79
62
        self.make_example_branch()
80
 
        self.build_tree_contents([('hello', 'hello world!\n')])
81
 
        out, err = self.run_bzr('diff --prefix old/:new/', retcode=1)
 
63
        file('hello', 'wt').write('hello world!\n')
 
64
        out, err = self.runbzr('diff --prefix old/:new/', retcode=1)
82
65
        self.assertEquals(err, '')
83
66
        self.assertEqualDiff(subst_dates(out), '''\
84
67
=== modified file 'hello'
90
73
 
91
74
''')
92
75
 
93
 
    def test_diff_illegal_prefix_value(self):
94
 
        # There was an error in error reporting for this option
95
 
        out, err = self.run_bzr('diff --prefix old/', retcode=3)
96
 
        self.assertContainsRe(err,
97
 
            '--prefix expects two values separated by a colon')
98
 
 
99
76
    def test_diff_p1(self):
100
77
        """diff -p1 produces lkml-style diffs"""
101
78
        self.make_example_branch()
102
 
        self.build_tree_contents([('hello', 'hello world!\n')])
103
 
        out, err = self.run_bzr('diff -p1', retcode=1)
 
79
        file('hello', 'wt').write('hello world!\n')
 
80
        out, err = self.runbzr('diff -p1', retcode=1)
104
81
        self.assertEquals(err, '')
105
82
        self.assertEqualDiff(subst_dates(out), '''\
106
83
=== modified file 'hello'
115
92
    def test_diff_p0(self):
116
93
        """diff -p0 produces diffs with no prefix"""
117
94
        self.make_example_branch()
118
 
        self.build_tree_contents([('hello', 'hello world!\n')])
119
 
        out, err = self.run_bzr('diff -p0', retcode=1)
 
95
        file('hello', 'wt').write('hello world!\n')
 
96
        out, err = self.runbzr('diff -p0', retcode=1)
120
97
        self.assertEquals(err, '')
121
98
        self.assertEqualDiff(subst_dates(out), '''\
122
99
=== modified file 'hello'
132
109
        # Get an error from a file that does not exist at all
133
110
        # (Malone #3619)
134
111
        self.make_example_branch()
135
 
        out, err = self.run_bzr('diff does-not-exist', retcode=3,
136
 
            error_regexes=('not versioned.*does-not-exist',))
137
 
 
138
 
    def test_diff_illegal_revision_specifiers(self):
139
 
        out, err = self.run_bzr('diff -r 1..23..123', retcode=3,
140
 
            error_regexes=('one or two revision specifiers',))
141
 
 
142
 
    def test_diff_using_and_format(self):
143
 
        out, err = self.run_bzr('diff --format=default --using=mydi', retcode=3,
144
 
            error_regexes=('are mutually exclusive',))
145
 
 
146
 
    def test_diff_nonexistent_revision(self):
147
 
        out, err = self.run_bzr('diff -r 123', retcode=3,
148
 
            error_regexes=("Requested revision: '123' does not "
149
 
                "exist in branch:",))
150
 
 
151
 
    def test_diff_nonexistent_dotted_revision(self):
152
 
        out, err = self.run_bzr('diff -r 1.1', retcode=3)
153
 
        self.assertContainsRe(err,
154
 
            "Requested revision: '1.1' does not exist in branch:")
155
 
 
156
 
    def test_diff_nonexistent_dotted_revision_change(self):
157
 
        out, err = self.run_bzr('diff -c 1.1', retcode=3)
158
 
        self.assertContainsRe(err,
159
 
            "Requested revision: '1.1' does not exist in branch:")
 
112
        out, err = self.runbzr('diff does-not-exist', retcode=3)
 
113
        self.assertContainsRe(err, 'not versioned.*does-not-exist')
160
114
 
161
115
    def test_diff_unversioned(self):
162
116
        # Get an error when diffing a non-versioned file.
163
117
        # (Malone #3619)
164
118
        self.make_example_branch()
165
119
        self.build_tree(['unversioned-file'])
166
 
        out, err = self.run_bzr('diff unversioned-file', retcode=3)
 
120
        out, err = self.runbzr('diff unversioned-file', retcode=3)
167
121
        self.assertContainsRe(err, 'not versioned.*unversioned-file')
168
122
 
169
123
    # TODO: What should diff say for a file deleted in working tree?
170
124
 
171
125
    def example_branches(self):
172
 
        branch1_tree = self.make_branch_and_tree('branch1')
173
 
        self.build_tree(['branch1/file'], line_endings='binary')
174
 
        self.build_tree(['branch1/file2'], line_endings='binary')
175
 
        branch1_tree.add('file')
176
 
        branch1_tree.add('file2')
177
 
        branch1_tree.commit(message='add file and file2')
178
 
        branch2_tree = branch1_tree.bzrdir.sprout('branch2').open_workingtree()
179
 
        self.build_tree_contents([('branch2/file', 'new content\n')])
180
 
        branch2_tree.commit(message='update file')
181
 
        return branch1_tree, branch2_tree
 
126
        self.build_tree(['branch1/', 'branch1/file'], line_endings='binary')
 
127
        self.capture('init branch1')
 
128
        self.capture('add branch1/file')
 
129
        self.run_bzr_captured(['commit', '-m', 'add file', 'branch1'])
 
130
        self.capture('branch branch1 branch2')
 
131
        print >> open('branch2/file', 'wb'), 'new content'
 
132
        self.run_bzr_captured(['commit', '-m', 'update file', 'branch2'])
182
133
 
183
 
    def check_b2_vs_b1(self, cmd):
184
 
        # Compare branch2 vs branch1 using cmd and check the result
185
 
        out, err = self.run_bzr(cmd, retcode=1)
 
134
    def test_diff_branches(self):
 
135
        self.example_branches()
 
136
        # should open branch1 and diff against branch2, 
 
137
        out, err = self.run_bzr_captured(['diff', '-r', 'branch:branch2', 
 
138
                                          'branch1'],
 
139
                                         retcode=1)
186
140
        self.assertEquals('', err)
187
141
        self.assertEquals("=== modified file 'file'\n"
188
142
                          "--- file\tYYYY-MM-DD HH:MM:SS +ZZZZ\n"
191
145
                          "-new content\n"
192
146
                          "+contents of branch1/file\n"
193
147
                          "\n", subst_dates(out))
194
 
 
195
 
    def check_b1_vs_b2(self, cmd):
196
 
        # Compare branch1 vs branch2 using cmd and check the result
197
 
        out, err = self.run_bzr(cmd, retcode=1)
198
 
        self.assertEquals('', err)
199
 
        self.assertEqualDiff("=== modified file 'file'\n"
200
 
                              "--- file\tYYYY-MM-DD HH:MM:SS +ZZZZ\n"
201
 
                              "+++ file\tYYYY-MM-DD HH:MM:SS +ZZZZ\n"
202
 
                              "@@ -1,1 +1,1 @@\n"
203
 
                              "-contents of branch1/file\n"
204
 
                              "+new content\n"
205
 
                              "\n", subst_dates(out))
206
 
 
207
 
    def check_no_diffs(self, cmd):
208
 
        # Check that running cmd returns an empty diff
209
 
        out, err = self.run_bzr(cmd, retcode=0)
210
 
        self.assertEquals('', err)
211
 
        self.assertEquals('', out)
212
 
 
213
 
    def test_diff_branches(self):
214
 
        self.example_branches()
215
 
        # should open branch1 and diff against branch2,
216
 
        self.check_b2_vs_b1('diff -r branch:branch2 branch1')
217
 
        # Compare two working trees using various syntax forms
218
 
        self.check_b2_vs_b1('diff --old branch2 --new branch1')
219
 
        self.check_b2_vs_b1('diff --old branch2 branch1')
220
 
        self.check_b2_vs_b1('diff branch2 --new branch1')
221
 
        # Test with a selected file that was changed
222
 
        self.check_b2_vs_b1('diff --old branch2 --new branch1 file')
223
 
        self.check_b2_vs_b1('diff --old branch2 branch1/file')
224
 
        self.check_b2_vs_b1('diff branch2/file --new branch1')
225
 
        # Test with a selected file that was not changed
226
 
        self.check_no_diffs('diff --old branch2 --new branch1 file2')
227
 
        self.check_no_diffs('diff --old branch2 branch1/file2')
228
 
        self.check_no_diffs('diff branch2/file2 --new branch1')
229
 
 
230
 
    def test_diff_branches_no_working_trees(self):
231
 
        branch1_tree, branch2_tree = self.example_branches()
232
 
        # Compare a working tree to a branch without a WT
233
 
        dir1 = branch1_tree.bzrdir
234
 
        dir1.destroy_workingtree()
235
 
        self.assertFalse(dir1.has_workingtree())
236
 
        self.check_b2_vs_b1('diff --old branch2 --new branch1')
237
 
        self.check_b2_vs_b1('diff --old branch2 branch1')
238
 
        self.check_b2_vs_b1('diff branch2 --new branch1')
239
 
        # Compare a branch without a WT to one with a WT
240
 
        self.check_b1_vs_b2('diff --old branch1 --new branch2')
241
 
        self.check_b1_vs_b2('diff --old branch1 branch2')
242
 
        self.check_b1_vs_b2('diff branch1 --new branch2')
243
 
        # Compare a branch with a WT against another without a WT
244
 
        dir2 = branch2_tree.bzrdir
245
 
        dir2.destroy_workingtree()
246
 
        self.assertFalse(dir2.has_workingtree())
247
 
        self.check_b1_vs_b2('diff --old branch1 --new branch2')
248
 
        self.check_b1_vs_b2('diff --old branch1 branch2')
249
 
        self.check_b1_vs_b2('diff branch1 --new branch2')
250
 
 
251
 
    def test_diff_revno_branches(self):
252
 
        self.example_branches()
253
 
        branch2_tree = workingtree.WorkingTree.open_containing('branch2')[0]
254
 
        self.build_tree_contents([('branch2/file', 'even newer content')])
255
 
        branch2_tree.commit(message='update file once more')
256
 
 
257
 
        out, err = self.run_bzr('diff -r revno:1:branch2..revno:1:branch1',
258
 
                                )
259
 
        self.assertEquals('', err)
260
 
        self.assertEquals('', out)
261
 
        out, err = self.run_bzr('diff -r revno:2:branch2..revno:1:branch1',
262
 
                                retcode=1)
 
148
        out, ett = self.run_bzr_captured(['diff', 'branch2', 'branch1'],
 
149
                                         retcode=1)
263
150
        self.assertEquals('', err)
264
151
        self.assertEqualDiff("=== modified file 'file'\n"
265
152
                              "--- file\tYYYY-MM-DD HH:MM:SS +ZZZZ\n"
270
157
                              "\n", subst_dates(out))
271
158
 
272
159
    def example_branch2(self):
273
 
        branch1_tree = self.make_branch_and_tree('branch1')
274
 
        self.build_tree_contents([('branch1/file1', 'original line\n')])
275
 
        branch1_tree.add('file1')
276
 
        branch1_tree.commit(message='first commit')
277
 
        self.build_tree_contents([('branch1/file1', 'repo line\n')])
278
 
        branch1_tree.commit(message='second commit')
279
 
        return branch1_tree
 
160
        self.build_tree(['branch1/', 'branch1/file1'], line_endings='binary')
 
161
        self.capture('init branch1')
 
162
        self.capture('add branch1/file1')
 
163
        print >> open('branch1/file1', 'wb'), 'original line'
 
164
        self.run_bzr_captured(['commit', '-m', 'first commit', 'branch1'])
 
165
        
 
166
        print >> open('branch1/file1', 'wb'), 'repo line'
 
167
        self.run_bzr_captured(['commit', '-m', 'second commit', 'branch1'])
280
168
 
281
169
    def test_diff_to_working_tree(self):
282
170
        self.example_branch2()
283
 
        self.build_tree_contents([('branch1/file1', 'new line')])
284
 
        output = self.run_bzr('diff -r 1.. branch1', retcode=1)
285
 
        self.assertContainsRe(output[0], '\n\\-original line\n\\+new line\n')
286
 
 
287
 
    def test_diff_to_working_tree_in_subdir(self):
288
 
        self.example_branch2()
289
 
        self.build_tree_contents([('branch1/file1', 'new line')])
290
 
        os.mkdir('branch1/dir1')
291
 
        os.chdir('branch1/dir1')
292
 
        output = self.run_bzr('diff -r 1..', retcode=1)
293
 
        self.assertContainsRe(output[0], '\n\\-original line\n\\+new line\n')
294
 
 
295
 
    def test_diff_across_rename(self):
296
 
        """The working tree path should always be considered for diffing"""
297
 
        tree = self.make_example_branch()
298
 
        self.run_bzr('diff -r 0..1 hello', retcode=1)
299
 
        tree.rename_one('hello', 'hello1')
300
 
        self.run_bzr('diff hello1', retcode=1)
301
 
        self.run_bzr('diff -r 0..1 hello1', retcode=1)
302
 
 
303
 
    def test_diff_to_branch_no_working_tree(self):
304
 
        branch1_tree = self.example_branch2()
305
 
        dir1 = branch1_tree.bzrdir
306
 
        dir1.destroy_workingtree()
307
 
        self.assertFalse(dir1.has_workingtree())
308
 
        output = self.run_bzr('diff -r 1.. branch1', retcode=1)
309
 
        self.assertContainsRe(output[0], '\n\\-original line\n\\+repo line\n')
310
 
 
311
 
    def test_custom_format(self):
312
 
        class BooDiffTree(DiffTree):
313
 
 
314
 
            def show_diff(self, specific_files, extra_trees=None):
315
 
                self.to_file.write("BOO!\n")
316
 
                return super(BooDiffTree, self).show_diff(specific_files,
317
 
                    extra_trees)
318
 
 
319
 
        diff_format_registry.register("boo", BooDiffTree, 
320
 
            "Scary diff format")
321
 
        self.addCleanup(diff_format_registry.remove, "boo")
322
 
        self.make_example_branch()
323
 
        self.build_tree_contents([('hello', 'hello world!\n')])
324
 
        output = self.run_bzr('diff --format=boo', retcode=1)
325
 
        self.assertTrue("BOO!" in output[0])
 
171
        
 
172
        print >> open('branch1/file1', 'wb'), 'new line'
 
173
        output = self.run_bzr_captured(['diff', '-r', '1..', 'branch1'], retcode=1)
 
174
        self.assertTrue('\n-original line\n+new line\n' in output[0])
 
175
 
326
176
 
327
177
class TestCheckoutDiff(TestDiff):
328
178
 
329
179
    def make_example_branch(self):
330
 
        tree = super(TestCheckoutDiff, self).make_example_branch()
331
 
        tree = tree.branch.create_checkout('checkout')
 
180
        super(TestCheckoutDiff, self).make_example_branch()
 
181
        self.runbzr('checkout . checkout')
332
182
        os.chdir('checkout')
333
 
        return tree
334
183
 
335
184
    def example_branch2(self):
336
 
        tree = super(TestCheckoutDiff, self).example_branch2()
 
185
        super(TestCheckoutDiff, self).example_branch2()
337
186
        os.mkdir('checkouts')
338
 
        tree = tree.branch.create_checkout('checkouts/branch1')
 
187
        self.runbzr('checkout branch1 checkouts/branch1')
339
188
        os.chdir('checkouts')
340
 
        return tree
341
189
 
342
190
    def example_branches(self):
343
 
        branch1_tree, branch2_tree = super(TestCheckoutDiff, self).example_branches()
 
191
        super(TestCheckoutDiff, self).example_branches()
344
192
        os.mkdir('checkouts')
345
 
        branch1_tree = branch1_tree.branch.create_checkout('checkouts/branch1')
346
 
        branch2_tree = branch2_tree.branch.create_checkout('checkouts/branch2')
 
193
        self.runbzr('checkout branch1 checkouts/branch1')
 
194
        self.runbzr('checkout branch2 checkouts/branch2')
347
195
        os.chdir('checkouts')
348
 
        return branch1_tree, branch2_tree
349
 
 
350
 
 
351
 
class TestDiffLabels(DiffBase):
 
196
 
 
197
 
 
198
class TestDiffLabels(TestDiff):
352
199
 
353
200
    def test_diff_label_removed(self):
354
 
        tree = super(TestDiffLabels, self).make_example_branch()
355
 
        tree.remove('hello', keep_files=False)
356
 
        diff = self.run_bzr('diff', retcode=1)
 
201
        super(TestDiffLabels, self).make_example_branch()
 
202
        self.runbzr('remove hello')
 
203
        diff = self.run_bzr_captured(['diff'], retcode=1)
357
204
        self.assertTrue("=== removed file 'hello'" in diff[0])
358
205
 
359
206
    def test_diff_label_added(self):
360
 
        tree = super(TestDiffLabels, self).make_example_branch()
361
 
        self.build_tree_contents([('barbar', 'barbar')])
362
 
        tree.add('barbar')
363
 
        diff = self.run_bzr('diff', retcode=1)
 
207
        super(TestDiffLabels, self).make_example_branch()
 
208
        file('barbar', 'wt').write('barbar')
 
209
        self.runbzr('add barbar')
 
210
        diff = self.run_bzr_captured(['diff'], retcode=1)
364
211
        self.assertTrue("=== added file 'barbar'" in diff[0])
365
212
 
366
213
    def test_diff_label_modified(self):
367
214
        super(TestDiffLabels, self).make_example_branch()
368
 
        self.build_tree_contents([('hello', 'barbar')])
369
 
        diff = self.run_bzr('diff', retcode=1)
 
215
        file('hello', 'wt').write('barbar')
 
216
        diff = self.run_bzr_captured(['diff'], retcode=1)
370
217
        self.assertTrue("=== modified file 'hello'" in diff[0])
371
218
 
372
219
    def test_diff_label_renamed(self):
373
 
        tree = super(TestDiffLabels, self).make_example_branch()
374
 
        tree.rename_one('hello', 'gruezi')
375
 
        diff = self.run_bzr('diff', retcode=1)
 
220
        super(TestDiffLabels, self).make_example_branch()
 
221
        self.runbzr('rename hello gruezi')
 
222
        diff = self.run_bzr_captured(['diff'], retcode=1)
376
223
        self.assertTrue("=== renamed file 'hello' => 'gruezi'" in diff[0])
377
 
 
378
 
 
379
 
class TestExternalDiff(DiffBase):
380
 
 
381
 
    def test_external_diff(self):
382
 
        """Test that we can spawn an external diff process"""
383
 
        self.disable_missing_extensions_warning()
384
 
        # We have to use run_bzr_subprocess, because we need to
385
 
        # test writing directly to stdout, (there was a bug in
386
 
        # subprocess.py that we had to workaround).
387
 
        # However, if 'diff' may not be available
388
 
        self.make_example_branch()
389
 
        # this will be automatically restored by the base bzr test class
390
 
        os.environ['BZR_PROGRESS_BAR'] = 'none'
391
 
        out, err = self.run_bzr_subprocess('diff -r 1 --diff-options -ub',
392
 
                                           universal_newlines=True,
393
 
                                           retcode=None)
394
 
        if 'Diff is not installed on this machine' in err:
395
 
            raise tests.TestSkipped("No external 'diff' is available")
396
 
        self.assertEqual('', err)
397
 
        # We have to skip the stuff in the middle, because it depends
398
 
        # on time.time()
399
 
        self.assertStartsWith(out, "=== added file 'goodbye'\n"
400
 
                                   "--- goodbye\t1970-01-01 00:00:00 +0000\n"
401
 
                                   "+++ goodbye\t")
402
 
        self.assertEndsWith(out, "\n@@ -0,0 +1 @@\n"
403
 
                                 "+baz\n\n")
404
 
 
405
 
    def test_external_diff_options_and_using(self):
406
 
        """Test that the options are passed correctly to an external diff process"""
407
 
        self.requireFeature(features.diff_feature)
408
 
        self.make_example_branch()
409
 
        self.build_tree_contents([('hello', 'Foo\n')])
410
 
        out, err = self.run_bzr('diff --diff-options -i --using diff',
411
 
                                    retcode=1)
412
 
        self.assertEquals("=== modified file 'hello'\n", out)
413
 
        self.assertEquals('', err)
414
 
 
415
 
 
416
 
class TestDiffOutput(DiffBase):
417
 
 
418
 
    def test_diff_output(self):
419
 
        # check that output doesn't mangle line-endings
420
 
        self.make_example_branch()
421
 
        self.build_tree_contents([('hello', 'hello world!\n')])
422
 
        output = self.run_bzr_subprocess('diff', retcode=1)[0]
423
 
        self.assert_('\n+hello world!\n' in output)