| """Unit tests for memory-based file-like objects. |
| StringIO -- for unicode strings |
| BytesIO -- for bytes |
| """ |
| |
| import unittest |
| from test import test_support |
| |
| import io |
| |
| try: |
| import _bytesio |
| has_c_implementation = True |
| except ImportError: |
| has_c_implementation = False |
| |
| |
| class MemoryTestMixin: |
| |
| def write_ops(self, f, t): |
| self.assertEqual(f.write(t("blah.")), 5) |
| self.assertEqual(f.seek(0), 0) |
| self.assertEqual(f.write(t("Hello.")), 6) |
| self.assertEqual(f.tell(), 6) |
| self.assertEqual(f.seek(5), 5) |
| self.assertEqual(f.tell(), 5) |
| self.assertEqual(f.write(t(" world\n\n\n")), 9) |
| self.assertEqual(f.seek(0), 0) |
| self.assertEqual(f.write(t("h")), 1) |
| self.assertEqual(f.truncate(12), 12) |
| self.assertEqual(f.tell(), 12) |
| |
| def test_write(self): |
| buf = self.buftype("hello world\n") |
| memio = self.ioclass(buf) |
| |
| self.write_ops(memio, self.buftype) |
| self.assertEqual(memio.getvalue(), buf) |
| memio = self.ioclass() |
| self.write_ops(memio, self.buftype) |
| self.assertEqual(memio.getvalue(), buf) |
| self.assertRaises(TypeError, memio.write, None) |
| memio.close() |
| self.assertRaises(ValueError, memio.write, self.buftype("")) |
| |
| def test_writelines(self): |
| buf = self.buftype("1234567890") |
| memio = self.ioclass() |
| |
| self.assertEqual(memio.writelines([buf] * 100), None) |
| self.assertEqual(memio.getvalue(), buf * 100) |
| memio.writelines([]) |
| self.assertEqual(memio.getvalue(), buf * 100) |
| memio = self.ioclass() |
| self.assertRaises(TypeError, memio.writelines, [buf] + [1]) |
| self.assertEqual(memio.getvalue(), buf) |
| self.assertRaises(TypeError, memio.writelines, None) |
| memio.close() |
| self.assertRaises(ValueError, memio.writelines, []) |
| |
| def test_writelines_error(self): |
| memio = self.ioclass() |
| def error_gen(): |
| yield self.buftype('spam') |
| raise KeyboardInterrupt |
| |
| self.assertRaises(KeyboardInterrupt, memio.writelines, error_gen()) |
| |
| def test_truncate(self): |
| buf = self.buftype("1234567890") |
| memio = self.ioclass(buf) |
| |
| self.assertRaises(ValueError, memio.truncate, -1) |
| memio.seek(6) |
| self.assertEqual(memio.truncate(), 6) |
| self.assertEqual(memio.getvalue(), buf[:6]) |
| self.assertEqual(memio.truncate(4), 4) |
| self.assertEqual(memio.getvalue(), buf[:4]) |
| self.assertEqual(memio.tell(), 4) |
| memio.write(buf) |
| self.assertEqual(memio.getvalue(), buf[:4] + buf) |
| pos = memio.tell() |
| self.assertEqual(memio.truncate(None), pos) |
| self.assertEqual(memio.tell(), pos) |
| self.assertRaises(TypeError, memio.truncate, '0') |
| memio.close() |
| self.assertRaises(ValueError, memio.truncate, 0) |
| |
| def test_init(self): |
| buf = self.buftype("1234567890") |
| memio = self.ioclass(buf) |
| self.assertEqual(memio.getvalue(), buf) |
| memio = self.ioclass(None) |
| self.assertEqual(memio.getvalue(), self.EOF) |
| memio.__init__(buf * 2) |
| self.assertEqual(memio.getvalue(), buf * 2) |
| memio.__init__(buf) |
| self.assertEqual(memio.getvalue(), buf) |
| |
| def test_read(self): |
| buf = self.buftype("1234567890") |
| memio = self.ioclass(buf) |
| |
| self.assertEqual(memio.read(0), self.EOF) |
| self.assertEqual(memio.read(1), buf[:1]) |
| self.assertEqual(memio.read(4), buf[1:5]) |
| self.assertEqual(memio.read(900), buf[5:]) |
| self.assertEqual(memio.read(), self.EOF) |
| memio.seek(0) |
| self.assertEqual(memio.read(), buf) |
| self.assertEqual(memio.read(), self.EOF) |
| self.assertEqual(memio.tell(), 10) |
| memio.seek(0) |
| self.assertEqual(memio.read(-1), buf) |
| memio.seek(0) |
| self.assertEqual(memio.read(None), buf) |
| self.assertRaises(TypeError, memio.read, '') |
| memio.close() |
| self.assertRaises(ValueError, memio.read) |
| |
| def test_readline(self): |
| buf = self.buftype("1234567890\n") |
| memio = self.ioclass(buf * 2) |
| |
| self.assertEqual(memio.readline(0), self.EOF) |
| self.assertEqual(memio.readline(), buf) |
| self.assertEqual(memio.readline(), buf) |
| self.assertEqual(memio.readline(), self.EOF) |
| memio.seek(0) |
| self.assertEqual(memio.readline(5), buf[:5]) |
| self.assertEqual(memio.readline(5), buf[5:10]) |
| self.assertEqual(memio.readline(5), buf[10:15]) |
| memio.seek(0) |
| self.assertEqual(memio.readline(-1), buf) |
| memio.seek(0) |
| self.assertEqual(memio.readline(0), self.EOF) |
| |
| buf = self.buftype("1234567890\n") |
| memio = self.ioclass((buf * 3)[:-1]) |
| self.assertEqual(memio.readline(), buf) |
| self.assertEqual(memio.readline(), buf) |
| self.assertEqual(memio.readline(), buf[:-1]) |
| self.assertEqual(memio.readline(), self.EOF) |
| memio.seek(0) |
| self.assertEqual(memio.readline(None), buf) |
| self.assertRaises(TypeError, memio.readline, '') |
| memio.close() |
| self.assertRaises(ValueError, memio.readline) |
| |
| def test_readlines(self): |
| buf = self.buftype("1234567890\n") |
| memio = self.ioclass(buf * 10) |
| |
| self.assertEqual(memio.readlines(), [buf] * 10) |
| memio.seek(5) |
| self.assertEqual(memio.readlines(), [buf[5:]] + [buf] * 9) |
| memio.seek(0) |
| self.assertEqual(memio.readlines(15), [buf] * 2) |
| memio.seek(0) |
| self.assertEqual(memio.readlines(-1), [buf] * 10) |
| memio.seek(0) |
| self.assertEqual(memio.readlines(0), [buf] * 10) |
| memio.seek(0) |
| self.assertEqual(memio.readlines(None), [buf] * 10) |
| self.assertRaises(TypeError, memio.readlines, '') |
| memio.close() |
| self.assertRaises(ValueError, memio.readlines) |
| |
| def test_iterator(self): |
| buf = self.buftype("1234567890\n") |
| memio = self.ioclass(buf * 10) |
| |
| self.assertEqual(iter(memio), memio) |
| self.failUnless(hasattr(memio, '__iter__')) |
| self.failUnless(hasattr(memio, '__next__')) |
| i = 0 |
| for line in memio: |
| self.assertEqual(line, buf) |
| i += 1 |
| self.assertEqual(i, 10) |
| memio.seek(0) |
| i = 0 |
| for line in memio: |
| self.assertEqual(line, buf) |
| i += 1 |
| self.assertEqual(i, 10) |
| memio = self.ioclass(buf * 2) |
| memio.close() |
| self.assertRaises(ValueError, memio.__next__) |
| |
| def test_getvalue(self): |
| buf = self.buftype("1234567890") |
| memio = self.ioclass(buf) |
| |
| self.assertEqual(memio.getvalue(), buf) |
| memio.read() |
| self.assertEqual(memio.getvalue(), buf) |
| memio = self.ioclass(buf * 1000) |
| self.assertEqual(memio.getvalue()[-3:], self.buftype("890")) |
| memio = self.ioclass(buf) |
| memio.close() |
| self.assertRaises(ValueError, memio.getvalue) |
| |
| def test_seek(self): |
| buf = self.buftype("1234567890") |
| memio = self.ioclass(buf) |
| |
| memio.read(5) |
| self.assertRaises(ValueError, memio.seek, -1) |
| self.assertRaises(ValueError, memio.seek, 1, -1) |
| self.assertRaises(ValueError, memio.seek, 1, 3) |
| self.assertEqual(memio.seek(0), 0) |
| self.assertEqual(memio.seek(0, 0), 0) |
| self.assertEqual(memio.read(), buf) |
| self.assertEqual(memio.seek(3), 3) |
| self.assertEqual(memio.seek(0, 1), 3) |
| self.assertEqual(memio.read(), buf[3:]) |
| self.assertEqual(memio.seek(len(buf)), len(buf)) |
| self.assertEqual(memio.read(), self.EOF) |
| memio.seek(len(buf) + 1) |
| self.assertEqual(memio.read(), self.EOF) |
| self.assertEqual(memio.seek(0, 2), len(buf)) |
| self.assertEqual(memio.read(), self.EOF) |
| memio.close() |
| self.assertRaises(ValueError, memio.seek, 0) |
| |
| def test_overseek(self): |
| buf = self.buftype("1234567890") |
| memio = self.ioclass(buf) |
| |
| self.assertEqual(memio.seek(len(buf) + 1), 11) |
| self.assertEqual(memio.read(), self.EOF) |
| self.assertEqual(memio.tell(), 11) |
| self.assertEqual(memio.getvalue(), buf) |
| memio.write(self.EOF) |
| self.assertEqual(memio.getvalue(), buf) |
| memio.write(buf) |
| self.assertEqual(memio.getvalue(), buf + self.buftype('\0') + buf) |
| |
| def test_tell(self): |
| buf = self.buftype("1234567890") |
| memio = self.ioclass(buf) |
| |
| self.assertEqual(memio.tell(), 0) |
| memio.seek(5) |
| self.assertEqual(memio.tell(), 5) |
| memio.seek(10000) |
| self.assertEqual(memio.tell(), 10000) |
| memio.close() |
| self.assertRaises(ValueError, memio.tell) |
| |
| def test_flush(self): |
| buf = self.buftype("1234567890") |
| memio = self.ioclass(buf) |
| |
| self.assertEqual(memio.flush(), None) |
| |
| def test_flags(self): |
| memio = self.ioclass() |
| |
| self.assertEqual(memio.writable(), True) |
| self.assertEqual(memio.readable(), True) |
| self.assertEqual(memio.seekable(), True) |
| self.assertEqual(memio.isatty(), False) |
| self.assertEqual(memio.closed, False) |
| memio.close() |
| self.assertEqual(memio.writable(), True) |
| self.assertEqual(memio.readable(), True) |
| self.assertEqual(memio.seekable(), True) |
| self.assertRaises(ValueError, memio.isatty) |
| self.assertEqual(memio.closed, True) |
| |
| def test_subclassing(self): |
| buf = self.buftype("1234567890") |
| def test1(): |
| class MemIO(self.ioclass): |
| pass |
| m = MemIO(buf) |
| return m.getvalue() |
| def test2(): |
| class MemIO(self.ioclass): |
| def __init__(me, a, b): |
| self.ioclass.__init__(me, a) |
| m = MemIO(buf, None) |
| return m.getvalue() |
| self.assertEqual(test1(), buf) |
| self.assertEqual(test2(), buf) |
| |
| |
| class PyBytesIOTest(MemoryTestMixin, unittest.TestCase): |
| @staticmethod |
| def buftype(s): |
| return s.encode("ascii") |
| ioclass = io._BytesIO |
| EOF = b"" |
| |
| def test_read1(self): |
| buf = self.buftype("1234567890") |
| memio = self.ioclass(buf) |
| |
| self.assertRaises(TypeError, memio.read1) |
| self.assertEqual(memio.read(), buf) |
| |
| def test_readinto(self): |
| buf = self.buftype("1234567890") |
| memio = self.ioclass(buf) |
| |
| b = bytearray(b"hello") |
| self.assertEqual(memio.readinto(b), 5) |
| self.assertEqual(b, b"12345") |
| self.assertEqual(memio.readinto(b), 5) |
| self.assertEqual(b, b"67890") |
| self.assertEqual(memio.readinto(b), 0) |
| self.assertEqual(b, b"67890") |
| b = bytearray(b"hello world") |
| memio.seek(0) |
| self.assertEqual(memio.readinto(b), 10) |
| self.assertEqual(b, b"1234567890d") |
| b = bytearray(b"") |
| memio.seek(0) |
| self.assertEqual(memio.readinto(b), 0) |
| self.assertEqual(b, b"") |
| self.assertRaises(TypeError, memio.readinto, '') |
| import array |
| a = array.array('b', b"hello world") |
| memio = self.ioclass(buf) |
| memio.readinto(a) |
| self.assertEqual(a.tostring(), b"1234567890d") |
| memio.close() |
| self.assertRaises(ValueError, memio.readinto, b) |
| |
| def test_relative_seek(self): |
| buf = self.buftype("1234567890") |
| memio = self.ioclass(buf) |
| |
| self.assertEqual(memio.seek(-1, 1), 0) |
| self.assertEqual(memio.seek(3, 1), 3) |
| self.assertEqual(memio.seek(-4, 1), 0) |
| self.assertEqual(memio.seek(-1, 2), 9) |
| self.assertEqual(memio.seek(1, 1), 10) |
| self.assertEqual(memio.seek(1, 2), 11) |
| memio.seek(-3, 2) |
| self.assertEqual(memio.read(), buf[-3:]) |
| memio.seek(0) |
| memio.seek(1, 1) |
| self.assertEqual(memio.read(), buf[1:]) |
| |
| def test_unicode(self): |
| memio = self.ioclass() |
| |
| self.assertRaises(TypeError, self.ioclass, "1234567890") |
| self.assertRaises(TypeError, memio.write, "1234567890") |
| self.assertRaises(TypeError, memio.writelines, ["1234567890"]) |
| |
| def test_bytes_array(self): |
| buf = b"1234567890" |
| import array |
| a = array.array('b', list(buf)) |
| memio = self.ioclass(a) |
| self.assertEqual(memio.getvalue(), buf) |
| self.assertEqual(memio.write(a), 10) |
| self.assertEqual(memio.getvalue(), buf) |
| |
| |
| class PyStringIOTest(MemoryTestMixin, unittest.TestCase): |
| buftype = str |
| ioclass = io.StringIO |
| EOF = "" |
| |
| def test_relative_seek(self): |
| memio = self.ioclass() |
| |
| self.assertRaises(IOError, memio.seek, -1, 1) |
| self.assertRaises(IOError, memio.seek, 3, 1) |
| self.assertRaises(IOError, memio.seek, -3, 1) |
| self.assertRaises(IOError, memio.seek, -1, 2) |
| self.assertRaises(IOError, memio.seek, 1, 1) |
| self.assertRaises(IOError, memio.seek, 1, 2) |
| |
| # XXX: For the Python version of io.StringIO, this is highly |
| # dependent on the encoding used for the underlying buffer. |
| # def test_widechar(self): |
| # buf = self.buftype("\U0002030a\U00020347") |
| # memio = self.ioclass(buf) |
| # |
| # self.assertEqual(memio.getvalue(), buf) |
| # self.assertEqual(memio.write(buf), len(buf)) |
| # self.assertEqual(memio.tell(), len(buf)) |
| # self.assertEqual(memio.getvalue(), buf) |
| # self.assertEqual(memio.write(buf), len(buf)) |
| # self.assertEqual(memio.tell(), len(buf) * 2) |
| # self.assertEqual(memio.getvalue(), buf + buf) |
| |
| if has_c_implementation: |
| class CBytesIOTest(PyBytesIOTest): |
| ioclass = io.BytesIO |
| |
| def test_main(): |
| tests = [PyBytesIOTest, PyStringIOTest] |
| if has_c_implementation: |
| tests.extend([CBytesIOTest]) |
| test_support.run_unittest(*tests) |
| |
| if __name__ == '__main__': |
| test_main() |