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 f.name # merely shouldn't blow up f.mode # ditto f.closed # ditto # 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 testReadinto_text(self): # verify readinto refuses text files a = array('c', 'x'*10) self.f.close() self.f = open(TESTFN, 'r') self.assertRaises(TypeError, self.f.readinto, a) 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(" # "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, "wb") 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, 'rb') 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, 'rb') 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, 'rb') 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()