[Python-checkins] r46752 - python/trunk/Lib/test/test_file.py
georg.brandl
python-checkins at python.org
Thu Jun 8 16:50:54 CEST 2006
Author: georg.brandl
Date: Thu Jun 8 16:50:53 2006
New Revision: 46752
Modified:
python/trunk/Lib/test/test_file.py
Log:
Convert test_file to unittest.
Modified: python/trunk/Lib/test/test_file.py
==============================================================================
--- python/trunk/Lib/test/test_file.py (original)
+++ python/trunk/Lib/test/test_file.py Thu Jun 8 16:50:53 2006
@@ -1,345 +1,318 @@
import sys
import os
+import unittest
from array import array
from weakref import proxy
-from test.test_support import verify, TESTFN, TestFailed, findfile
+from test.test_support import TESTFN, findfile, run_unittest
from UserList import UserList
-# verify weak references
-f = file(TESTFN, 'w')
-p = proxy(f)
-p.write('teststring')
-verify(f.tell(), p.tell())
-f.close()
-f = None
-try:
- p.tell()
-except ReferenceError:
- pass
-else:
- raise TestFailed('file proxy still exists when the file is gone')
-
-# verify expected attributes exist
-f = file(TESTFN, 'w')
-softspace = f.softspace
-f.name # merely shouldn't blow up
-f.mode # ditto
-f.closed # ditto
-
-# verify softspace is writable
-f.softspace = softspace # merely shouldn't blow up
-
-# verify the others aren't
-for attr in 'name', 'mode', 'closed':
- try:
- setattr(f, attr, 'oops')
- except (AttributeError, TypeError):
- pass
- else:
- raise TestFailed('expected exception setting file attr %r' % attr)
-f.close()
-
-# check invalid mode strings
-for mode in ("", "aU", "wU+"):
- try:
- f = file(TESTFN, mode)
- except ValueError:
- pass
- else:
- f.close()
- raise TestFailed('%r is an invalid file mode' % mode)
+class AutoFileTests(unittest.TestCase):
+ # file tests for which a test file is automatically set up
-# verify writelines with instance sequence
-l = UserList(['1', '2'])
-f = open(TESTFN, 'wb')
-f.writelines(l)
-f.close()
-f = open(TESTFN, 'rb')
-buf = f.read()
-f.close()
-verify(buf == '12')
-
-# verify readinto
-a = array('c', 'x'*10)
-f = open(TESTFN, 'rb')
-n = f.readinto(a)
-f.close()
-verify(buf == a.tostring()[:n])
-
-# verify writelines with integers
-f = open(TESTFN, 'wb')
-try:
- f.writelines([1, 2, 3])
-except TypeError:
- pass
-else:
- print "writelines accepted sequence of integers"
-f.close()
-
-# verify writelines with integers in UserList
-f = open(TESTFN, 'wb')
-l = UserList([1,2,3])
-try:
- f.writelines(l)
-except TypeError:
- pass
-else:
- print "writelines accepted sequence of integers"
-f.close()
-
-# verify writelines with non-string object
-class NonString: pass
-
-f = open(TESTFN, 'wb')
-try:
- f.writelines([NonString(), NonString()])
-except TypeError:
- pass
-else:
- print "writelines accepted sequence of non-string objects"
-f.close()
-
-# This causes the interpreter to exit on OSF1 v5.1.
-if sys.platform != 'osf1V5':
- try:
- sys.stdin.seek(-1)
- except IOError:
- pass
- else:
- print "should not be able to seek on sys.stdin"
-else:
- print >>sys.__stdout__, (
- ' Skipping sys.stdin.seek(-1), it may crash the interpreter.'
- ' Test manually.')
-
-try:
- sys.stdin.truncate()
-except IOError:
- pass
-else:
- print "should not be able to truncate on sys.stdin"
-
-# verify repr works
-f = open(TESTFN)
-if not repr(f).startswith("<open file '" + TESTFN):
- print "repr(file) failed"
-f.close()
-
-# verify repr works for unicode too
-f = open(unicode(TESTFN))
-if not repr(f).startswith("<open file u'" + TESTFN):
- print "repr(file with unicode name) failed"
-f.close()
-
-# verify that we get a sensible error message for bad mode argument
-bad_mode = "qwerty"
-try:
- open(TESTFN, bad_mode)
-except ValueError, msg:
- if msg[0] != 0:
- s = str(msg)
- if s.find(TESTFN) != -1 or s.find(bad_mode) == -1:
- print "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:
- print "no error for invalid mode: %s" % bad_mode
-
-f = open(TESTFN)
-if f.name != TESTFN:
- raise TestFailed, 'file.name should be "%s"' % TESTFN
-if f.isatty():
- raise TestFailed, 'file.isatty() should be false'
-
-if f.closed:
- raise TestFailed, 'file.closed should be false'
-
-try:
- f.readinto("")
-except TypeError:
- pass
-else:
- raise TestFailed, 'file.readinto("") should raise a TypeError'
-
-f.close()
-if not f.closed:
- raise TestFailed, 'file.closed should be true'
-
-# make sure that explicitly setting the buffer size doesn't cause
-# misbehaviour especially with repeated close() calls
-for s in (-1, 0, 1, 512):
- try:
- f = open(TESTFN, 'w', s)
- f.write(str(s))
- f.close()
- f.close()
- f = open(TESTFN, 'r', s)
- d = int(f.read())
- f.close()
- f.close()
- except IOError, msg:
- raise TestFailed, 'error setting buffer size %d: %s' % (s, str(msg))
- if d != s:
- raise TestFailed, 'readback failure using buffer size %d'
-
-methods = ['fileno', 'flush', 'isatty', 'next', 'read', 'readinto',
- 'readline', 'readlines', 'seek', 'tell', 'truncate', 'write',
- 'xreadlines', '__iter__']
-if sys.platform.startswith('atheos'):
- methods.remove('truncate')
-
-for methodname in methods:
- method = getattr(f, methodname)
- try:
- method()
- except ValueError:
- pass
- else:
- raise TestFailed, 'file.%s() on a closed file should raise a ValueError' % methodname
-
-try:
- f.writelines([])
-except ValueError:
- pass
-else:
- raise TestFailed, 'file.writelines([]) on a closed file should raise a ValueError'
-
-os.unlink(TESTFN)
-
-def bug801631():
- # SF bug <http://www.python.org/sf/801631>
- # "file.truncate fault on windows"
- f = file(TESTFN, 'wb')
- f.write('12345678901') # 11 bytes
- f.close()
-
- f = file(TESTFN,'rb+')
- data = f.read(5)
- if data != '12345':
- raise TestFailed("Read on file opened for update failed %r" % data)
- if f.tell() != 5:
- raise TestFailed("File pos after read wrong %d" % f.tell())
-
- f.truncate()
- if f.tell() != 5:
- raise TestFailed("File pos after ftruncate wrong %d" % f.tell())
-
- f.close()
- size = os.path.getsize(TESTFN)
- if size != 5:
- raise TestFailed("File size after ftruncate wrong %d" % size)
-
-try:
- bug801631()
-finally:
- os.unlink(TESTFN)
-
-# Test the complex interaction when mixing file-iteration and the various
-# read* methods. Ostensibly, the mixture could just be tested to work
-# when it should work according to the Python language, instead of fail
-# when it should fail according to the current CPython implementation.
-# People don't always program Python the way they should, though, and the
-# implemenation might change in subtle ways, so we explicitly test for
-# errors, too; the test will just have to be updated when the
-# implementation changes.
-dataoffset = 16384
-filler = "ham\n"
-assert not dataoffset % len(filler), \
- "dataoffset must be multiple of len(filler)"
-nchunks = dataoffset // len(filler)
-testlines = [
- "spam, spam and eggs\n",
- "eggs, spam, ham and spam\n",
- "saussages, spam, spam and eggs\n",
- "spam, ham, spam and eggs\n",
- "spam, spam, spam, spam, spam, ham, spam\n",
- "wonderful spaaaaaam.\n"
-]
-methods = [("readline", ()), ("read", ()), ("readlines", ()),
- ("readinto", (array("c", " "*100),))]
-
-try:
- # Prepare the testfile
- bag = open(TESTFN, "w")
- bag.write(filler * nchunks)
- bag.writelines(testlines)
- bag.close()
- # Test for appropriate errors mixing read* and iteration
- for methodname, args in methods:
- f = open(TESTFN)
- if f.next() != filler:
- raise TestFailed, "Broken testfile"
- meth = getattr(f, methodname)
+ def setUp(self):
+ self.f = file(TESTFN, 'wb')
+
+ def tearDown(self):
try:
- meth(*args)
- except ValueError:
+ if self.f:
+ self.f.close()
+ except IOError:
pass
+
+ def testWeakRefs(self):
+ # verify weak references
+ p = proxy(self.f)
+ p.write('teststring')
+ self.assertEquals(self.f.tell(), p.tell())
+ self.f.close()
+ self.f = None
+ self.assertRaises(ReferenceError, getattr, p, 'tell')
+
+ def testAttributes(self):
+ # verify expected attributes exist
+ f = self.f
+ softspace = f.softspace
+ f.name # merely shouldn't blow up
+ f.mode # ditto
+ f.closed # ditto
+
+ # verify softspace is writable
+ f.softspace = softspace # merely shouldn't blow up
+
+ # verify the others aren't
+ for attr in 'name', 'mode', 'closed':
+ self.assertRaises((AttributeError, TypeError), setattr, f, attr, 'oops')
+
+ def testReadinto(self):
+ # verify readinto
+ self.f.write('12')
+ self.f.close()
+ a = array('c', 'x'*10)
+ self.f = open(TESTFN, 'rb')
+ n = self.f.readinto(a)
+ self.assertEquals('12', a.tostring()[:n])
+
+ def testWritelinesUserList(self):
+ # verify writelines with instance sequence
+ l = UserList(['1', '2'])
+ self.f.writelines(l)
+ self.f.close()
+ self.f = open(TESTFN, 'rb')
+ buf = self.f.read()
+ self.assertEquals(buf, '12')
+
+ def testWritelinesIntegers(self):
+ # verify writelines with integers
+ self.assertRaises(TypeError, self.f.writelines, [1, 2, 3])
+
+ def testWritelinesIntegersUserList(self):
+ # verify writelines with integers in UserList
+ l = UserList([1,2,3])
+ self.assertRaises(TypeError, self.f.writelines, l)
+
+ def testWritelinesNonString(self):
+ # verify writelines with non-string object
+ class NonString: pass
+
+ self.assertRaises(TypeError, self.f.writelines, [NonString(), NonString()])
+
+ def testRepr(self):
+ # verify repr works
+ self.assert_(repr(self.f).startswith("<open file '" + TESTFN))
+
+ def testErrors(self):
+ f = self.f
+ self.assertEquals(f.name, TESTFN)
+ self.assert_(not f.isatty())
+ self.assert_(not f.closed)
+
+ self.assertRaises(TypeError, f.readinto, "")
+ f.close()
+ self.assert_(f.closed)
+
+ def testMethods(self):
+ methods = ['fileno', 'flush', 'isatty', 'next', 'read', 'readinto',
+ 'readline', 'readlines', 'seek', 'tell', 'truncate', 'write',
+ 'xreadlines', '__iter__']
+ if sys.platform.startswith('atheos'):
+ methods.remove('truncate')
+
+ self.f.close()
+
+ for methodname in methods:
+ method = getattr(self.f, methodname)
+ # should raise on closed file
+ self.assertRaises(ValueError, method)
+ self.assertRaises(ValueError, self.f.writelines, [])
+
+
+class OtherFileTests(unittest.TestCase):
+
+ def testModeStrings(self):
+ # check invalid mode strings
+ for mode in ("", "aU", "wU+"):
+ try:
+ f = file(TESTFN, mode)
+ except ValueError:
+ pass
+ else:
+ f.close()
+ self.fail('%r is an invalid file mode' % mode)
+
+ def testStdin(self):
+ # This causes the interpreter to exit on OSF1 v5.1.
+ if sys.platform != 'osf1V5':
+ self.assertRaises(IOError, sys.stdin.seek, -1)
else:
- raise TestFailed("%s%r after next() didn't raise ValueError" %
- (methodname, args))
+ print >>sys.__stdout__, (
+ ' Skipping sys.stdin.seek(-1), it may crash the interpreter.'
+ ' Test manually.')
+ self.assertRaises(IOError, sys.stdin.truncate)
+
+ def testUnicodeOpen(self):
+ # verify repr works for unicode too
+ f = open(unicode(TESTFN), "w")
+ self.assert_(repr(f).startswith("<open file u'" + TESTFN))
f.close()
- # Test to see if harmless (by accident) mixing of read* and iteration
- # still works. This depends on the size of the internal iteration
- # buffer (currently 8192,) but we can test it in a flexible manner.
- # Each line in the bag o' ham is 4 bytes ("h", "a", "m", "\n"), so
- # 4096 lines of that should get us exactly on the buffer boundary for
- # any power-of-2 buffersize between 4 and 16384 (inclusive).
- f = open(TESTFN)
- for i in range(nchunks):
- f.next()
- testline = testlines.pop(0)
- try:
- line = f.readline()
- except ValueError:
- raise TestFailed("readline() after next() with supposedly empty "
- "iteration-buffer failed anyway")
- if line != testline:
- raise TestFailed("readline() after next() with empty buffer "
- "failed. Got %r, expected %r" % (line, testline))
- testline = testlines.pop(0)
- buf = array("c", "\x00" * len(testline))
- try:
- f.readinto(buf)
- except ValueError:
- raise TestFailed("readinto() after next() with supposedly empty "
- "iteration-buffer failed anyway")
- line = buf.tostring()
- if line != testline:
- raise TestFailed("readinto() after next() with empty buffer "
- "failed. Got %r, expected %r" % (line, testline))
-
- testline = testlines.pop(0)
- try:
- line = f.read(len(testline))
- except ValueError:
- raise TestFailed("read() after next() with supposedly empty "
- "iteration-buffer failed anyway")
- if line != testline:
- raise TestFailed("read() after next() with empty buffer "
- "failed. Got %r, expected %r" % (line, testline))
- try:
- lines = f.readlines()
- except ValueError:
- raise TestFailed("readlines() after next() with supposedly empty "
- "iteration-buffer failed anyway")
- if lines != testlines:
- raise TestFailed("readlines() after next() with empty buffer "
- "failed. Got %r, expected %r" % (line, testline))
- # Reading after iteration hit EOF shouldn't hurt either
- f = open(TESTFN)
- try:
- for line in f:
- pass
+ def testBadModeArgument(self):
+ # verify that we get a sensible error message for bad mode argument
+ bad_mode = "qwerty"
try:
- f.readline()
- f.readinto(buf)
- f.read()
- f.readlines()
- except ValueError:
- raise TestFailed("read* failed after next() consumed file")
- finally:
- f.close()
-finally:
- os.unlink(TESTFN)
+ f = open(TESTFN, bad_mode)
+ except ValueError, msg:
+ if msg[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 testSetBufferSize(self):
+ # make sure that explicitly setting the buffer size doesn't cause
+ # misbehaviour especially with repeated close() calls
+ for s in (-1, 0, 1, 512):
+ try:
+ f = open(TESTFN, 'w', s)
+ f.write(str(s))
+ f.close()
+ f.close()
+ f = open(TESTFN, 'r', s)
+ d = int(f.read())
+ f.close()
+ f.close()
+ except IOError, msg:
+ self.fail('error setting buffer size %d: %s' % (s, str(msg)))
+ self.assertEquals(d, s)
+
+ def testTruncateOnWindows(self):
+ os.unlink(TESTFN)
+
+ def bug801631():
+ # SF bug <http://www.python.org/sf/801631>
+ # "file.truncate fault on windows"
+ f = file(TESTFN, 'wb')
+ f.write('12345678901') # 11 bytes
+ f.close()
+
+ f = file(TESTFN,'rb+')
+ data = f.read(5)
+ if data != '12345':
+ 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 testIteration(self):
+ # Test the complex interaction when mixing file-iteration and the various
+ # read* methods. Ostensibly, the mixture could just be tested to work
+ # when it should work according to the Python language, instead of fail
+ # when it should fail according to the current CPython implementation.
+ # People don't always program Python the way they should, though, and the
+ # implemenation might change in subtle ways, so we explicitly test for
+ # errors, too; the test will just have to be updated when the
+ # implementation changes.
+ dataoffset = 16384
+ filler = "ham\n"
+ assert not dataoffset % len(filler), \
+ "dataoffset must be multiple of len(filler)"
+ nchunks = dataoffset // len(filler)
+ testlines = [
+ "spam, spam and eggs\n",
+ "eggs, spam, ham and spam\n",
+ "saussages, spam, spam and eggs\n",
+ "spam, ham, spam and eggs\n",
+ "spam, spam, spam, spam, spam, ham, spam\n",
+ "wonderful spaaaaaam.\n"
+ ]
+ methods = [("readline", ()), ("read", ()), ("readlines", ()),
+ ("readinto", (array("c", " "*100),))]
+
+ try:
+ # Prepare the testfile
+ bag = open(TESTFN, "w")
+ bag.write(filler * nchunks)
+ bag.writelines(testlines)
+ bag.close()
+ # Test for appropriate errors mixing read* and iteration
+ for methodname, args in methods:
+ f = open(TESTFN)
+ if f.next() != filler:
+ self.fail, "Broken testfile"
+ meth = getattr(f, methodname)
+ try:
+ meth(*args)
+ except ValueError:
+ pass
+ else:
+ self.fail("%s%r after next() didn't raise ValueError" %
+ (methodname, args))
+ f.close()
+
+ # Test to see if harmless (by accident) mixing of read* and iteration
+ # still works. This depends on the size of the internal iteration
+ # buffer (currently 8192,) but we can test it in a flexible manner.
+ # Each line in the bag o' ham is 4 bytes ("h", "a", "m", "\n"), so
+ # 4096 lines of that should get us exactly on the buffer boundary for
+ # any power-of-2 buffersize between 4 and 16384 (inclusive).
+ f = open(TESTFN)
+ for i in range(nchunks):
+ f.next()
+ testline = testlines.pop(0)
+ try:
+ line = f.readline()
+ except ValueError:
+ self.fail("readline() after next() with supposedly empty "
+ "iteration-buffer failed anyway")
+ if line != testline:
+ self.fail("readline() after next() with empty buffer "
+ "failed. Got %r, expected %r" % (line, testline))
+ testline = testlines.pop(0)
+ buf = array("c", "\x00" * len(testline))
+ try:
+ f.readinto(buf)
+ except ValueError:
+ self.fail("readinto() after next() with supposedly empty "
+ "iteration-buffer failed anyway")
+ line = buf.tostring()
+ if line != testline:
+ self.fail("readinto() after next() with empty buffer "
+ "failed. Got %r, expected %r" % (line, testline))
+
+ testline = testlines.pop(0)
+ try:
+ line = f.read(len(testline))
+ except ValueError:
+ self.fail("read() after next() with supposedly empty "
+ "iteration-buffer failed anyway")
+ if line != testline:
+ self.fail("read() after next() with empty buffer "
+ "failed. Got %r, expected %r" % (line, testline))
+ try:
+ lines = f.readlines()
+ except ValueError:
+ self.fail("readlines() after next() with supposedly empty "
+ "iteration-buffer failed anyway")
+ if lines != testlines:
+ self.fail("readlines() after next() with empty buffer "
+ "failed. Got %r, expected %r" % (line, testline))
+ # Reading after iteration hit EOF shouldn't hurt either
+ f = open(TESTFN)
+ try:
+ for line in f:
+ pass
+ try:
+ f.readline()
+ f.readinto(buf)
+ f.read()
+ f.readlines()
+ except ValueError:
+ self.fail("read* failed after next() consumed file")
+ finally:
+ f.close()
+ finally:
+ os.unlink(TESTFN)
+
+
+def test_main():
+ run_unittest(AutoFileTests, OtherFileTests)
+
+if __name__ == '__main__':
+ test_main()
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