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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 227e375..1316572 100644 --- a/Lib/test/test_codecs.py +++ b/Lib/test/test_codecs.py @@ -1592,6 +1592,26 @@ class SurrogateEscapeTest(unittest.TestCase): b"\xe4\xeb\xef\xf6\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', 'w+', 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(): support.run_unittest( UTF32Test, @@ -1619,6 +1639,7 @@ def test_main(): WithStmtTest, TypesTest, SurrogateEscapeTest, + BomTest, ) |