Issue #18048: Merge test_pep263.py and test_coding.py into test_source_encoding.py.

diff --cc Lib/test/test_source_encoding.py
index 7f5ddb1934b4a611076e2c2d8def47b61ebd8ec3,a3abc3c2ec48c24df0705aeeee0ada24fafa3197..5ea8b8f8572fb7cdb1cd866f9b0642a717c29d3e
--- 1/Lib/test/test_source_encoding.py
--- 2/Lib/test/test_source_encoding.py
+++ b/Lib/test/test_source_encoding.py
@@@ -1,37 -1,71 +1,97 @@@
+ # -*- coding: koi8-r -*-
  
 -import unittest
 -from test import test_support
 +import test.test_support, unittest
 +import os
  
- class CodingTest(unittest.TestCase):
 -class PEP263Test(unittest.TestCase):
++class SourceEncodingTest(unittest.TestCase):
+ 
+     def test_pep263(self):
+         self.assertEqual(
+             u"ðÉÔÏÎ".encode("utf-8"),
+             '\xd0\x9f\xd0\xb8\xd1\x82\xd0\xbe\xd0\xbd'
+         )
+         self.assertEqual(
+             u"\ð".encode("utf-8"),
+             '\\\xd0\x9f'
+         )
+ 
+     def test_compilestring(self):
+         # see #1882
+         c = compile("\n# coding: utf-8\nu = u'\xc3\xb3'\n", "dummy", "exec")
+         d = {}
+         exec c in d
+         self.assertEqual(d['u'], u'\xf3')
+ 
 -
+     def test_issue3297(self):
+         c = compile("a, b = '\U0001010F', '\\U0001010F'", "dummy", "exec")
+         d = {}
+         exec(c, d)
+         self.assertEqual(d['a'], d['b'])
+         self.assertEqual(len(d['a']), len(d['b']))
+ 
+     def test_issue7820(self):
+         # Ensure that check_bom() restores all bytes in the right order if
+         # check_bom() fails in pydebug mode: a buffer starts with the first
+         # byte of a valid BOM, but next bytes are different
+ 
+         # one byte in common with the UTF-16-LE BOM
+         self.assertRaises(SyntaxError, eval, '\xff\x20')
+ 
+         # two bytes in common with the UTF-8 BOM
+         self.assertRaises(SyntaxError, eval, '\xef\xbb\x20')
+ 
+     def test_error_message(self):
+         compile('# -*- coding: iso-8859-15 -*-\n', 'dummy', 'exec')
+         compile('\xef\xbb\xbf\n', 'dummy', 'exec')
+         compile('\xef\xbb\xbf# -*- coding: utf-8 -*-\n', 'dummy', 'exec')
+         with self.assertRaisesRegexp(SyntaxError, 'fake'):
+             compile('# -*- coding: fake -*-\n', 'dummy', 'exec')
+         with self.assertRaisesRegexp(SyntaxError, 'iso-8859-15'):
+             compile('\xef\xbb\xbf# -*- coding: iso-8859-15 -*-\n',
+                     'dummy', 'exec')
+         with self.assertRaisesRegexp(SyntaxError, 'BOM'):
+             compile('\xef\xbb\xbf# -*- coding: iso-8859-15 -*-\n',
+                     'dummy', 'exec')
+         with self.assertRaisesRegexp(SyntaxError, 'fake'):
+             compile('\xef\xbb\xbf# -*- coding: fake -*-\n', 'dummy', 'exec')
+         with self.assertRaisesRegexp(SyntaxError, 'BOM'):
+             compile('\xef\xbb\xbf# -*- coding: fake -*-\n', 'dummy', 'exec')
+ 
+     def test_non_unicode_codec(self):
+         with self.assertRaisesRegexp(SyntaxError,
+                                      'codec did not return a unicode'):
+             from test import bad_coding3
+ 
+ 
 +    def test_bad_coding(self):
 +        module_name = 'bad_coding'
 +        self.verify_bad_module(module_name)
 +
 +    def test_bad_coding2(self):
 +        module_name = 'bad_coding2'
 +        self.verify_bad_module(module_name)
 +
 +    def verify_bad_module(self, module_name):
 +        self.assertRaises(SyntaxError, __import__, 'test.' + module_name)
 +
 +        path = os.path.dirname(__file__)
 +        filename = os.path.join(path, module_name + '.py')
 +        with open(filename) as fp:
 +            text = fp.read()
 +        self.assertRaises(SyntaxError, compile, text, filename, 'exec')
 +
 +    def test_error_from_string(self):
 +        # See http://bugs.python.org/issue6289
 +        input = u"# coding: ascii\n\N{SNOWMAN}".encode('utf-8')
 +        with self.assertRaises(SyntaxError) as c:
 +            compile(input, "<string>", "exec")
 +        expected = "'ascii' codec can't decode byte 0xe2 in position 16: " \
 +                   "ordinal not in range(128)"
 +        self.assertTrue(c.exception.args[0].startswith(expected))
 +
 +
  def test_main():
-     test.test_support.run_unittest(CodingTest)
 -    test_support.run_unittest(PEP263Test)
++    test.test_support.run_unittest(SourceEncodingTest)
  
 -if __name__=="__main__":
 +if __name__ == "__main__":
      test_main()