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- # Tests StringIO and cStringIO
-
- import unittest
- import StringIO
- import cStringIO
- import types
- 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
- 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()
- 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_truncate(self):
- eq = self.assertEqual
- f = self.MODULE.StringIO()
- f.write(self._lines)
- f.seek(10)
- f.truncate()
- eq(f.getvalue(), 'abcdefghij')
- f.seek(0)
- f.truncate(5)
- eq(f.getvalue(), 'abcde')
- f.close()
- self.assertRaises(ValueError, f.write, 'frobnitz')
-
- def test_iterator(self):
- eq = self.assertEqual
- unless = self.failUnless
- it = iter(self._fp)
- # Does this object support the iteration protocol?
- unless(hasattr(it, '__iter__'))
- unless(hasattr(it, 'next'))
- i = 0
- for line in self._fp:
- eq(line, self._line + '\n')
- i += 1
- eq(i, 5)
-
- class TestStringIO(TestGenericStringIO):
- MODULE = StringIO
-
- if test_support.have_unicode:
- def test_unicode(self):
-
- # 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)
- test_support.run_unittest(TestcStringIO)
- test_support.run_unittest(TestBufferStringIO)
- test_support.run_unittest(TestBuffercStringIO)
-
- if __name__ == '__main__':
- test_main()
-