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

diff --cc Lib/test/test_source_encoding.py
index dfd5431dee86ea5b1278b3ec8958e74f61790136,1290bc70de66c9b6342fdfb8e7e989b6c3ccac21..0e539d5767bdd9d08a3644a9afbb8b4126518738
--- 1/Lib/test/test_source_encoding.py
--- 2/Lib/test/test_source_encoding.py
+++ b/Lib/test/test_source_encoding.py
@@@ -1,65 -1,80 +1,134 @@@
- import test.support, unittest
+ # -*- coding: koi8-r -*-
+ 
+ import unittest
 -from test import support
 +from test.support import TESTFN, unlink, unload
- import importlib, os, sys
++import importlib
++import os
++import sys
+ 
 -class PEP263Test(unittest.TestCase):
++class SourceEncodingTest(unittest.TestCase):
+ 
+     def test_pep263(self):
+         self.assertEqual(
+             "ðÉÔÏÎ".encode("utf-8"),
+             b'\xd0\x9f\xd0\xb8\xd1\x82\xd0\xbe\xd0\xbd'
+         )
+         self.assertEqual(
+             "\ð".encode("utf-8"),
+             b'\\\xd0\x9f'
+         )
+ 
+     def test_compilestring(self):
+         # see #1882
+         c = compile(b"\n# coding: utf-8\nu = '\xc3\xb3'\n", "dummy", "exec")
+         d = {}
+         exec(c, d)
+         self.assertEqual(d['u'], '\xf3')
+ 
+     def test_issue2301(self):
+         try:
+             compile(b"# coding: cp932\nprint '\x94\x4e'", "dummy", "exec")
+         except SyntaxError as v:
+             self.assertEqual(v.text, "print '\u5e74'\n")
+         else:
+             self.fail()
+ 
+     def test_issue4626(self):
+         c = compile("# coding=latin-1\n\u00c6 = '\u00c6'", "dummy", "exec")
+         d = {}
+         exec(c, d)
+         self.assertEqual(d['\xc6'], '\xc6')
+ 
+     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']))
+         self.assertEqual(ascii(d['a']), ascii(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, b'\xff\x20')
+ 
+         # two bytes in common with the UTF-8 BOM
+         self.assertRaises(SyntaxError, eval, b'\xef\xbb\x20')
+ 
+     def test_error_message(self):
+         compile(b'# -*- coding: iso-8859-15 -*-\n', 'dummy', 'exec')
+         compile(b'\xef\xbb\xbf\n', 'dummy', 'exec')
+         compile(b'\xef\xbb\xbf# -*- coding: utf-8 -*-\n', 'dummy', 'exec')
+         with self.assertRaisesRegexp(SyntaxError, 'fake'):
+             compile(b'# -*- coding: fake -*-\n', 'dummy', 'exec')
+         with self.assertRaisesRegexp(SyntaxError, 'iso-8859-15'):
+             compile(b'\xef\xbb\xbf# -*- coding: iso-8859-15 -*-\n',
+                     'dummy', 'exec')
+         with self.assertRaisesRegexp(SyntaxError, 'BOM'):
+             compile(b'\xef\xbb\xbf# -*- coding: iso-8859-15 -*-\n',
+                     'dummy', 'exec')
+         with self.assertRaisesRegexp(SyntaxError, 'fake'):
+             compile(b'\xef\xbb\xbf# -*- coding: fake -*-\n', 'dummy', 'exec')
+         with self.assertRaisesRegexp(SyntaxError, 'BOM'):
+             compile(b'\xef\xbb\xbf# -*- coding: fake -*-\n', 'dummy', 'exec')
  
- class CodingTest(unittest.TestCase):
 +    def test_bad_coding(self):
 +        module_name = 'bad_coding'
 +        self.verify_bad_module(module_name)
  
 -def test_main():
 -    support.run_unittest(PEP263Test)
 +    def test_bad_coding2(self):
 +        module_name = 'bad_coding2'
 +        self.verify_bad_module(module_name)
  
 -if __name__=="__main__":
 -    test_main()
 +    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, "rb") as fp:
 +            bytes = fp.read()
 +        self.assertRaises(SyntaxError, compile, bytes, filename, 'exec')
 +
 +    def test_exec_valid_coding(self):
 +        d = {}
 +        exec('# coding: cp949\na = 5\n', d)
 +        self.assertEqual(d['a'], 5)
 +
 +    def test_file_parse(self):
 +        # issue1134: all encodings outside latin-1 and utf-8 fail on
 +        # multiline strings and long lines (>512 columns)
 +        unload(TESTFN)
 +        sys.path.insert(0, os.curdir)
 +        filename = TESTFN + ".py"
 +        f = open(filename, "w")
 +        try:
 +            f.write("# -*- coding: cp1252 -*-\n")
 +            f.write("'''A short string\n")
 +            f.write("'''\n")
 +            f.write("'A very long string %s'\n" % ("X" * 1000))
 +            f.close()
 +
 +            importlib.invalidate_caches()
 +            __import__(TESTFN)
 +        finally:
 +            f.close()
 +            unlink(filename)
 +            unlink(filename + "c")
 +            unload(TESTFN)
 +            del sys.path[0]
 +
 +    def test_error_from_string(self):
 +        # See http://bugs.python.org/issue6289
 +        input = "# 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.support.run_unittest(CodingTest)
- 
 +if __name__ == "__main__":
-     test_main()
++    unittest.main()