| 1 | # Tests StringIO and cStringIO |
| 2 | |
| 3 | import unittest |
| 4 | import StringIO |
| 5 | import cStringIO |
| 6 | import types |
| 7 | from test import test_support |
| 8 | |
| 9 | |
| 10 | class TestGenericStringIO(unittest.TestCase): |
| 11 | # use a class variable MODULE to define which module is being tested |
| 12 | |
| 13 | # Line of data to test as string |
| 14 | _line = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!' |
| 15 | |
| 16 | # Constructor to use for the test data (._line is passed to this |
| 17 | # constructor) |
| 18 | constructor = str |
| 19 | |
| 20 | def setUp(self): |
| 21 | self._line = self.constructor(self._line) |
| 22 | self._lines = self.constructor((self._line + '\n') * 5) |
| 23 | self._fp = self.MODULE.StringIO(self._lines) |
| 24 | |
| 25 | def test_reads(self): |
| 26 | eq = self.assertEqual |
| 27 | self.assertRaises(TypeError, self._fp.seek) |
| 28 | eq(self._fp.read(10), self._line[:10]) |
| 29 | eq(self._fp.readline(), self._line[10:] + '\n') |
| 30 | eq(len(self._fp.readlines(60)), 2) |
| 31 | |
| 32 | def test_writes(self): |
| 33 | f = self.MODULE.StringIO() |
| 34 | self.assertRaises(TypeError, f.seek) |
| 35 | f.write(self._line[:6]) |
| 36 | f.seek(3) |
| 37 | f.write(self._line[20:26]) |
| 38 | f.write(self._line[52]) |
| 39 | self.assertEqual(f.getvalue(), 'abcuvwxyz!') |
| 40 | |
| 41 | def test_writelines(self): |
| 42 | f = self.MODULE.StringIO() |
| 43 | f.writelines([self._line[0], self._line[1], self._line[2]]) |
| 44 | f.seek(0) |
| 45 | self.assertEqual(f.getvalue(), 'abc') |
| 46 | |
| 47 | def test_writelines_error(self): |
| 48 | def errorGen(): |
| 49 | yield 'a' |
| 50 | raise KeyboardInterrupt() |
| 51 | f = self.MODULE.StringIO() |
| 52 | self.assertRaises(KeyboardInterrupt, f.writelines, errorGen()) |
| 53 | |
| 54 | def test_truncate(self): |
| 55 | eq = self.assertEqual |
| 56 | f = self.MODULE.StringIO() |
| 57 | f.write(self._lines) |
| 58 | f.seek(10) |
| 59 | f.truncate() |
| 60 | eq(f.getvalue(), 'abcdefghij') |
| 61 | f.truncate(5) |
| 62 | eq(f.getvalue(), 'abcde') |
| 63 | f.write('xyz') |
| 64 | eq(f.getvalue(), 'abcdexyz') |
| 65 | f.close() |
| 66 | self.assertRaises(ValueError, f.write, 'frobnitz') |
| 67 | |
| 68 | def test_closed_flag(self): |
| 69 | f = self.MODULE.StringIO() |
| 70 | self.assertEqual(f.closed, False) |
| 71 | f.close() |
| 72 | self.assertEqual(f.closed, True) |
| 73 | f = self.MODULE.StringIO("abc") |
| 74 | self.assertEqual(f.closed, False) |
| 75 | f.close() |
| 76 | self.assertEqual(f.closed, True) |
| 77 | |
| 78 | def test_iterator(self): |
| 79 | eq = self.assertEqual |
| 80 | unless = self.failUnless |
| 81 | eq(iter(self._fp), self._fp) |
| 82 | # Does this object support the iteration protocol? |
| 83 | unless(hasattr(self._fp, '__iter__')) |
| 84 | unless(hasattr(self._fp, 'next')) |
| 85 | i = 0 |
| 86 | for line in self._fp: |
| 87 | eq(line, self._line + '\n') |
| 88 | i += 1 |
| 89 | eq(i, 5) |
| 90 | |
| 91 | class TestStringIO(TestGenericStringIO): |
| 92 | MODULE = StringIO |
| 93 | |
| 94 | def test_unicode(self): |
| 95 | |
| 96 | if not test_support.have_unicode: return |
| 97 | |
| 98 | # The StringIO module also supports concatenating Unicode |
| 99 | # snippets to larger Unicode strings. This is tested by this |
| 100 | # method. Note that cStringIO does not support this extension. |
| 101 | |
| 102 | f = self.MODULE.StringIO() |
| 103 | f.write(self._line[:6]) |
| 104 | f.seek(3) |
| 105 | f.write(unicode(self._line[20:26])) |
| 106 | f.write(unicode(self._line[52])) |
| 107 | s = f.getvalue() |
| 108 | self.assertEqual(s, unicode('abcuvwxyz!')) |
| 109 | self.assertEqual(type(s), types.UnicodeType) |
| 110 | |
| 111 | class TestcStringIO(TestGenericStringIO): |
| 112 | MODULE = cStringIO |
| 113 | |
| 114 | import sys |
| 115 | if sys.platform.startswith('java'): |
| 116 | # Jython doesn't have a buffer object, so we just do a useless |
| 117 | # fake of the buffer tests. |
| 118 | buffer = str |
| 119 | |
| 120 | class TestBufferStringIO(TestStringIO): |
| 121 | constructor = buffer |
| 122 | |
| 123 | class TestBuffercStringIO(TestcStringIO): |
| 124 | constructor = buffer |
| 125 | |
| 126 | |
| 127 | def test_main(): |
| 128 | test_support.run_unittest( |
| 129 | TestStringIO, |
| 130 | TestcStringIO, |
| 131 | TestBufferStringIO, |
| 132 | TestBuffercStringIO |
| 133 | ) |
| 134 | |
| 135 | if __name__ == '__main__': |
| 136 | test_main() |