| 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 |
| |
| class AutoFileTests(unittest.TestCase): |
| # file tests for which a test file is automatically set up |
| |
| def setUp(self): |
| self.f = open(TESTFN, 'wb') |
| |
| def tearDown(self): |
| if self.f: |
| self.f.close() |
| os.remove(TESTFN) |
| |
| 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') |
| |
| # __exit__ should close the file |
| self.f.__exit__(None, None, None) |
| self.assert_(self.f.closed) |
| |
| for methodname in methods: |
| method = getattr(self.f, methodname) |
| # should raise on closed file |
| self.assertRaises(ValueError, method) |
| self.assertRaises(ValueError, self.f.writelines, []) |
| |
| # file is closed, __exit__ shouldn't do anything |
| self.assertEquals(self.f.__exit__(None, None, None), None) |
| # it must also return None if an exception was given |
| try: |
| 1/0 |
| except: |
| self.assertEquals(self.f.__exit__(*sys.exc_info()), None) |
| |
| |
| class OtherFileTests(unittest.TestCase): |
| |
| def testModeStrings(self): |
| # check invalid mode strings |
| for mode in ("", "aU", "wU+"): |
| try: |
| f = open(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: |
| 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() |
| os.unlink(TESTFN) |
| |
| def testBadModeArgument(self): |
| # verify that we get a sensible error message for bad mode argument |
| bad_mode = "qwerty" |
| try: |
| 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 = open(TESTFN, 'wb') |
| f.write('12345678901') # 11 bytes |
| f.close() |
| |
| f = open(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(): |
| # 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() |