128 lines
3.6 KiB
Python
128 lines
3.6 KiB
Python
# Tests StringIO and cStringIO
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import sys
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import unittest
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import io
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from test import test_support
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class TestGenericStringIO:
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# use a class variable CLASS to define which class is being tested
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CLASS = None
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# Line of data to test as string
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_line = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!'
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# Constructor to use for the test data (._line is passed to this
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# constructor)
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constructor = str
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def setUp(self):
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self._line = self.constructor(self._line)
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self._lines = self.constructor((self._line + '\n') * 5)
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self._fp = self.CLASS(self._lines)
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def test_reads(self):
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eq = self.assertEqual
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self.assertRaises(TypeError, self._fp.seek)
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eq(self._fp.read(10), self._line[:10])
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eq(self._fp.readline(), self._line[10:] + '\n')
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eq(len(self._fp.readlines(60)), 2)
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def test_writes(self):
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f = self.CLASS()
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self.assertRaises(TypeError, f.seek)
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f.write(self._line[:6])
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f.seek(3)
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f.write(self._line[20:26])
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f.write(self._line[52])
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self.assertEqual(f.getvalue(), 'abcuvwxyz!')
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def test_writelines(self):
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f = self.CLASS()
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f.writelines([self._line[0], self._line[1], self._line[2]])
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f.seek(0)
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self.assertEqual(f.getvalue(), 'abc')
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def test_writelines_error(self):
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def errorGen():
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yield 'a'
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raise KeyboardInterrupt()
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f = self.CLASS()
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self.assertRaises(KeyboardInterrupt, f.writelines, errorGen())
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def test_truncate(self):
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eq = self.assertEqual
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f = self.CLASS()
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f.write(self._lines)
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f.seek(10)
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f.truncate()
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eq(f.getvalue(), 'abcdefghij')
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f.truncate(5)
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eq(f.getvalue(), 'abcde')
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f.write('xyz')
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eq(f.getvalue(), 'abcdexyz')
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self.assertRaises(ValueError, f.truncate, -1)
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f.close()
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self.assertRaises(ValueError, f.write, 'frobnitz')
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def test_closed_flag(self):
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f = self.CLASS()
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self.assertEqual(f.closed, False)
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f.close()
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self.assertEqual(f.closed, True)
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f = self.CLASS(self.constructor("abc"))
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self.assertEqual(f.closed, False)
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f.close()
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self.assertEqual(f.closed, True)
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def test_isatty(self):
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f = self.CLASS()
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self.assertRaises(TypeError, f.isatty, None)
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self.assertEqual(f.isatty(), False)
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f.close()
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self.assertRaises(ValueError, f.isatty)
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def test_iterator(self):
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eq = self.assertEqual
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unless = self.failUnless
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eq(iter(self._fp), self._fp)
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# Does this object support the iteration protocol?
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unless(hasattr(self._fp, '__iter__'))
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unless(hasattr(self._fp, '__next__'))
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i = 0
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for line in self._fp:
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eq(line, self._line + '\n')
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i += 1
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eq(i, 5)
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self._fp.close()
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self.assertRaises(StopIteration, next, self._fp)
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class TestioStringIO(TestGenericStringIO, unittest.TestCase):
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CLASS = io.StringIO
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def test_unicode(self):
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if not test_support.have_unicode: return
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# The StringIO module also supports concatenating Unicode
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# snippets to larger Unicode strings. This is tested by this
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# method. Note that cStringIO does not support this extension.
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f = self.CLASS()
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f.write(self._line[:6])
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f.seek(3)
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f.write(str(self._line[20:26]))
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f.write(str(self._line[52]))
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s = f.getvalue()
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self.assertEqual(s, str('abcuvwxyz!'))
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self.assertEqual(type(s), str)
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def test_main():
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test_support.run_unittest(TestioStringIO)
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if __name__ == '__main__':
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test_main()
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