diff options
Diffstat (limited to 'Lib/test/test_codecs.py')
| -rw-r--r-- | Lib/test/test_codecs.py | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/Lib/test/test_codecs.py b/Lib/test/test_codecs.py index f8563f61ae..306a3b2ee6 100644 --- a/Lib/test/test_codecs.py +++ b/Lib/test/test_codecs.py @@ -1496,6 +1496,26 @@ class WithStmtTest(unittest.TestCase): self.assertEquals(srw.read(), u"\xfc") +class BomTest(unittest.TestCase): + def test_seek0(self): + data = "1234567890" + tests = ("utf-16", + "utf-16-le", + "utf-16-be", + "utf-32", + "utf-32-le", + "utf-32-be") + for encoding in tests: + with codecs.open('foo', 'wt+', encoding=encoding) as f: + # Check if the BOM is written only once + f.write(data) + f.write(data) + f.seek(0) + self.assertEquals(f.read(), data * 2) + f.seek(0) + self.assertEquals(f.read(), data * 2) + + def test_main(): test_support.run_unittest( UTF32Test, @@ -1524,6 +1544,7 @@ def test_main(): BasicStrTest, CharmapTest, WithStmtTest, + BomTest, ) |