/Lib/test/test_StringIO.py
http://unladen-swallow.googlecode.com/ · Python · 146 lines · 109 code · 26 blank · 11 comment · 4 complexity · 3d83d03836dd0d1cd9121ecece162d31 MD5 · raw file
- # Tests StringIO and cStringIO
- import unittest
- import StringIO
- import cStringIO
- import types
- from test import test_support
- class TestGenericStringIO(unittest.TestCase):
- # use a class variable MODULE to define which module is being tested
- # Line of data to test as string
- _line = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!'
- # Constructor to use for the test data (._line is passed to this
- # constructor)
- constructor = str
- def setUp(self):
- self._line = self.constructor(self._line)
- self._lines = self.constructor((self._line + '\n') * 5)
- self._fp = self.MODULE.StringIO(self._lines)
- def test_reads(self):
- eq = self.assertEqual
- self.assertRaises(TypeError, self._fp.seek)
- eq(self._fp.read(10), self._line[:10])
- eq(self._fp.readline(), self._line[10:] + '\n')
- eq(len(self._fp.readlines(60)), 2)
- def test_writes(self):
- f = self.MODULE.StringIO()
- self.assertRaises(TypeError, f.seek)
- f.write(self._line[:6])
- f.seek(3)
- f.write(self._line[20:26])
- f.write(self._line[52])
- self.assertEqual(f.getvalue(), 'abcuvwxyz!')
- def test_writelines(self):
- f = self.MODULE.StringIO()
- f.writelines([self._line[0], self._line[1], self._line[2]])
- f.seek(0)
- self.assertEqual(f.getvalue(), 'abc')
- def test_writelines_error(self):
- def errorGen():
- yield 'a'
- raise KeyboardInterrupt()
- f = self.MODULE.StringIO()
- self.assertRaises(KeyboardInterrupt, f.writelines, errorGen())
- def test_truncate(self):
- eq = self.assertEqual
- f = self.MODULE.StringIO()
- f.write(self._lines)
- f.seek(10)
- f.truncate()
- eq(f.getvalue(), 'abcdefghij')
- f.truncate(5)
- eq(f.getvalue(), 'abcde')
- f.write('xyz')
- eq(f.getvalue(), 'abcdexyz')
- self.assertRaises(IOError, f.truncate, -1)
- f.close()
- self.assertRaises(ValueError, f.write, 'frobnitz')
- def test_closed_flag(self):
- f = self.MODULE.StringIO()
- self.assertEqual(f.closed, False)
- f.close()
- self.assertEqual(f.closed, True)
- f = self.MODULE.StringIO("abc")
- self.assertEqual(f.closed, False)
- f.close()
- self.assertEqual(f.closed, True)
- def test_isatty(self):
- f = self.MODULE.StringIO()
- self.assertRaises(TypeError, f.isatty, None)
- self.assertEqual(f.isatty(), False)
- f.close()
- self.assertRaises(ValueError, f.isatty)
- def test_iterator(self):
- eq = self.assertEqual
- unless = self.failUnless
- eq(iter(self._fp), self._fp)
- # Does this object support the iteration protocol?
- unless(hasattr(self._fp, '__iter__'))
- unless(hasattr(self._fp, 'next'))
- i = 0
- for line in self._fp:
- eq(line, self._line + '\n')
- i += 1
- eq(i, 5)
- self._fp.close()
- self.assertRaises(ValueError, self._fp.next)
- class TestStringIO(TestGenericStringIO):
- MODULE = StringIO
- def test_unicode(self):
- if not test_support.have_unicode: return
- # The StringIO module also supports concatenating Unicode
- # snippets to larger Unicode strings. This is tested by this
- # method. Note that cStringIO does not support this extension.
- f = self.MODULE.StringIO()
- f.write(self._line[:6])
- f.seek(3)
- f.write(unicode(self._line[20:26]))
- f.write(unicode(self._line[52]))
- s = f.getvalue()
- self.assertEqual(s, unicode('abcuvwxyz!'))
- self.assertEqual(type(s), types.UnicodeType)
- class TestcStringIO(TestGenericStringIO):
- MODULE = cStringIO
- import sys
- if sys.platform.startswith('java'):
- # Jython doesn't have a buffer object, so we just do a useless
- # fake of the buffer tests.
- buffer = str
- class TestBufferStringIO(TestStringIO):
- constructor = buffer
- class TestBuffercStringIO(TestcStringIO):
- constructor = buffer
- def test_main():
- test_support.run_unittest(
- TestStringIO,
- TestcStringIO,
- TestBufferStringIO,
- TestBuffercStringIO
- )
- if __name__ == '__main__':
- test_main()