summaryrefslogtreecommitdiffstats
path: root/Lib/test/test_fileio.py
blob: 064ec0caad8e2dc2f9ca82282c3a9ce4fd0aaeb2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
# Adapted from test_file.py by Daniel Stutzbach

import sys
import os
import unittest
from array import array
from weakref import proxy

from test.test_support import TESTFN, findfile, run_unittest
from UserList import UserList

import _fileio

class AutoFileTests(unittest.TestCase):
    # file tests for which a test file is automatically set up

    def setUp(self):
        self.f = _fileio._FileIO(TESTFN, 'w')

    def tearDown(self):
        if self.f:
            self.f.close()
        os.remove(TESTFN)

    def testWeakRefs(self):
        # verify weak references
        p = proxy(self.f)
        p.write(bytes(range(10)))
        self.assertEquals(self.f.tell(), p.tell())
        self.f.close()
        self.f = None
        self.assertRaises(ReferenceError, getattr, p, 'tell')

    def testSeekTell(self):
        self.f.write(bytes(range(20)))
        self.assertEquals(self.f.tell(), 20)
        self.f.seek(0)
        self.assertEquals(self.f.tell(), 0)
        self.f.seek(10)
        self.assertEquals(self.f.tell(), 10)
        self.f.seek(5, 1)
        self.assertEquals(self.f.tell(), 15)
        self.f.seek(-5, 1)
        self.assertEquals(self.f.tell(), 10)
        self.f.seek(-5, 2)
        self.assertEquals(self.f.tell(), 15)

    def testAttributes(self):
        # verify expected attributes exist
        f = self.f

        self.assertEquals(f.mode, "w")
        self.assertEquals(f.closed, False)

        # verify the attributes are readonly
        for attr in 'mode', 'closed':
            self.assertRaises((AttributeError, TypeError),
                              setattr, f, attr, 'oops')

    def testReadinto(self):
        # verify readinto
        self.f.write(bytes([1, 2]))
        self.f.close()
        a = array('b', b'x'*10)
        self.f = _fileio._FileIO(TESTFN, 'r')
        n = self.f.readinto(a)
        self.assertEquals(array('b', [1, 2]), a[:n])

    def testRepr(self):
        self.assertEquals(repr(self.f),
                          "_fileio._FileIO(%d, %s)" % (self.f.fileno(),
                                                       repr(self.f.mode)))

    def testErrors(self):
        f = self.f
        self.assert_(not f.isatty())
        self.assert_(not f.closed)
        #self.assertEquals(f.name, TESTFN)
        self.assertRaises(ValueError, f.read, 10) # Open for reading
        f.close()
        self.assert_(f.closed)
        f = _fileio._FileIO(TESTFN, 'r')
        self.assertRaises(TypeError, f.readinto, "")
        self.assert_(not f.closed)
        f.close()
        self.assert_(f.closed)

    def testMethods(self):
        methods = ['fileno', 'isatty', 'read', 'readinto',
                   'seek', 'tell', 'truncate', 'write', 'seekable',
                   'readable', 'writable']
        if sys.platform.startswith('atheos'):
            methods.remove('truncate')

        self.f.close()
        self.assert_(self.f.closed)

        for methodname in methods:
            method = getattr(self.f, methodname)
            # should raise on closed file
            self.assertRaises(ValueError, method)


class OtherFileTests(unittest.TestCase):

    def testAbles(self):
        try:
            f = _fileio._FileIO(TESTFN, "w")
            self.assertEquals(f.readable(), False)
            self.assertEquals(f.writable(), True)
            self.assertEquals(f.seekable(), True)
            f.close()

            f = _fileio._FileIO(TESTFN, "r")
            self.assertEquals(f.readable(), True)
            self.assertEquals(f.writable(), False)
            self.assertEquals(f.seekable(), True)
            f.close()

            f = _fileio._FileIO(TESTFN, "a+")
            self.assertEquals(f.readable(), True)
            self.assertEquals(f.writable(), True)
            self.assertEquals(f.seekable(), True)
            self.assertEquals(f.isatty(), False)
            f.close()

            try:
                f = _fileio._FileIO("/dev/tty", "a")
            except EnvironmentError:
                # When run in a cron job there just aren't any ttys,
                # so skip the test.  This also handles Windows and
                # other OS'es that don't support /dev/tty.
                pass
            else:
                f = _fileio._FileIO("/dev/tty", "a")
                self.assertEquals(f.readable(), False)
                self.assertEquals(f.writable(), True)
                if sys.platform != "darwin":
                    # Somehow /dev/tty appears seekable on OSX
                    self.assertEquals(f.seekable(), False)
                self.assertEquals(f.isatty(), True)
                f.close()
        finally:
            os.unlink(TESTFN)

    def testModeStrings(self):
        # check invalid mode strings
        for mode in ("", "aU", "wU+", "rb", "rt"):
            try:
                f = _fileio._FileIO(TESTFN, mode)
            except ValueError:
                pass
            else:
                f.close()
                self.fail('%r is an invalid file mode' % mode)

    def testUnicodeOpen(self):
        # verify repr works for unicode too
        f = _fileio._FileIO(str(TESTFN), "w")
        f.close()
        os.unlink(TESTFN)

    def testBadModeArgument(self):
        # verify that we get a sensible error message for bad mode argument
        bad_mode = "qwerty"
        try:
            f = _fileio._FileIO(TESTFN, bad_mode)
        except ValueError as msg:
            if msg.args[0] != 0:
                s = str(msg)
                if s.find(TESTFN) != -1 or s.find(bad_mode) == -1:
                    self.fail("bad error message for invalid mode: %s" % s)
            # if msg[0] == 0, we're probably on Windows where there may be
            # no obvious way to discover why open() failed.
        else:
            f.close()
            self.fail("no error for invalid mode: %s" % bad_mode)

    def testTruncateOnWindows(self):
        def bug801631():
            # SF bug <http://www.python.org/sf/801631>
            # "file.truncate fault on windows"
            f = _fileio._FileIO(TESTFN, 'w')
            f.write(bytes(range(11)))
            f.close()

            f = _fileio._FileIO(TESTFN,'r+')
            data = f.read(5)
            if data != bytes(range(5)):
                self.fail("Read on file opened for update failed %r" % data)
            if f.tell() != 5:
                self.fail("File pos after read wrong %d" % f.tell())

            f.truncate()
            if f.tell() != 5:
                self.fail("File pos after ftruncate wrong %d" % f.tell())

            f.close()
            size = os.path.getsize(TESTFN)
            if size != 5:
                self.fail("File size after ftruncate wrong %d" % size)

        try:
            bug801631()
        finally:
            os.unlink(TESTFN)

def test_main():
    # Historically, these tests have been sloppy about removing TESTFN.
    # So get rid of it no matter what.
    try:
        run_unittest(AutoFileTests, OtherFileTests)
    finally:
        if os.path.exists(TESTFN):
            os.unlink(TESTFN)

if __name__ == '__main__':
    test_main()