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diff --git a/Lib/sqlite3/test/test_regression.py b/Lib/sqlite3/test/test_regression.py
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+# pysqlite2/test/regression.py: pysqlite regression tests
+#
+# Copyright (C) 2006-2010 Gerhard Häring <gh@ghaering.de>
+#
+# This file is part of pysqlite.
+#
+# This software is provided 'as-is', without any express or implied
+# warranty.  In no event will the authors be held liable for any damages
+# arising from the use of this software.
+#
+# Permission is granted to anyone to use this software for any purpose,
+# including commercial applications, and to alter it and redistribute it
+# freely, subject to the following restrictions:
+#
+# 1. The origin of this software must not be misrepresented; you must not
+#    claim that you wrote the original software. If you use this software
+#    in a product, an acknowledgment in the product documentation would be
+#    appreciated but is not required.
+# 2. Altered source versions must be plainly marked as such, and must not be
+#    misrepresented as being the original software.
+# 3. This notice may not be removed or altered from any source distribution.
+
+import datetime
+import sys
+import unittest
+import sqlite3 as sqlite
+import weakref
+import functools
+from test import support
+
+class RegressionTests(unittest.TestCase):
+    def setUp(self):
+        self.con = sqlite.connect(":memory:")
+
+    def tearDown(self):
+        self.con.close()
+
+    def test_pragma_user_version(self):
+        # This used to crash pysqlite because this pragma command returns NULL for the column name
+        cur = self.con.cursor()
+        cur.execute("pragma user_version")
+
+    def test_pragma_schema_version(self):
+        # This still crashed pysqlite <= 2.2.1
+        con = sqlite.connect(":memory:", detect_types=sqlite.PARSE_COLNAMES)
+        try:
+            cur = self.con.cursor()
+            cur.execute("pragma schema_version")
+        finally:
+            cur.close()
+            con.close()
+
+    def test_statement_reset(self):
+        # pysqlite 2.1.0 to 2.2.0 have the problem that not all statements are
+        # reset before a rollback, but only those that are still in the
+        # statement cache. The others are not accessible from the connection object.
+        con = sqlite.connect(":memory:", cached_statements=5)
+        cursors = [con.cursor() for x in range(5)]
+        cursors[0].execute("create table test(x)")
+        for i in range(10):
+            cursors[0].executemany("insert into test(x) values (?)", [(x,) for x in range(10)])
+
+        for i in range(5):
+            cursors[i].execute(" " * i + "select x from test")
+
+        con.rollback()
+
+    def test_column_name_with_spaces(self):
+        cur = self.con.cursor()
+        cur.execute('select 1 as "foo bar [datetime]"')
+        self.assertEqual(cur.description[0][0], "foo bar [datetime]")
+
+        cur.execute('select 1 as "foo baz"')
+        self.assertEqual(cur.description[0][0], "foo baz")
+
+    def test_statement_finalization_on_close_db(self):
+        # pysqlite versions <= 2.3.3 only finalized statements in the statement
+        # cache when closing the database. statements that were still
+        # referenced in cursors weren't closed and could provoke "
+        # "OperationalError: Unable to close due to unfinalised statements".
+        con = sqlite.connect(":memory:")
+        cursors = []
+        # default statement cache size is 100
+        for i in range(105):
+            cur = con.cursor()
+            cursors.append(cur)
+            cur.execute("select 1 x union select " + str(i))
+        con.close()
+
+    def test_on_conflict_rollback(self):
+        con = sqlite.connect(":memory:")
+        con.execute("create table foo(x, unique(x) on conflict rollback)")
+        con.execute("insert into foo(x) values (1)")
+        try:
+            con.execute("insert into foo(x) values (1)")
+        except sqlite.DatabaseError:
+            pass
+        con.execute("insert into foo(x) values (2)")
+        try:
+            con.commit()
+        except sqlite.OperationalError:
+            self.fail("pysqlite knew nothing about the implicit ROLLBACK")
+
+    def test_workaround_for_buggy_sqlite_transfer_bindings(self):
+        """
+        pysqlite would crash with older SQLite versions unless
+        a workaround is implemented.
+        """
+        self.con.execute("create table foo(bar)")
+        self.con.execute("drop table foo")
+        self.con.execute("create table foo(bar)")
+
+    def test_empty_statement(self):
+        """
+        pysqlite used to segfault with SQLite versions 3.5.x. These return NULL
+        for "no-operation" statements
+        """
+        self.con.execute("")
+
+    def test_type_map_usage(self):
+        """
+        pysqlite until 2.4.1 did not rebuild the row_cast_map when recompiling
+        a statement. This test exhibits the problem.
+        """
+        SELECT = "select * from foo"
+        con = sqlite.connect(":memory:",detect_types=sqlite.PARSE_DECLTYPES)
+        con.execute("create table foo(bar timestamp)")
+        con.execute("insert into foo(bar) values (?)", (datetime.datetime.now(),))
+        con.execute(SELECT).close()
+        con.execute("drop table foo")
+        con.execute("create table foo(bar integer)")
+        con.execute("insert into foo(bar) values (5)")
+        con.execute(SELECT).close()
+
+    def test_bind_mutating_list(self):
+        # Issue41662: Crash when mutate a list of parameters during iteration.
+        class X:
+            def __conform__(self, protocol):
+                parameters.clear()
+                return "..."
+        parameters = [X(), 0]
+        con = sqlite.connect(":memory:",detect_types=sqlite.PARSE_DECLTYPES)
+        con.execute("create table foo(bar X, baz integer)")
+        # Should not crash
+        with self.assertRaises(IndexError):
+            con.execute("insert into foo(bar, baz) values (?, ?)", parameters)
+
+    def test_error_msg_decode_error(self):
+        # When porting the module to Python 3.0, the error message about
+        # decoding errors disappeared. This verifies they're back again.
+        with self.assertRaises(sqlite.OperationalError) as cm:
+            self.con.execute("select 'xxx' || ? || 'yyy' colname",
+                             (bytes(bytearray([250])),)).fetchone()
+        msg = "Could not decode to UTF-8 column 'colname' with text 'xxx"
+        self.assertIn(msg, str(cm.exception))
+
+    def test_register_adapter(self):
+        """
+        See issue 3312.
+        """
+        self.assertRaises(TypeError, sqlite.register_adapter, {}, None)
+
+    def test_set_isolation_level(self):
+        # See issue 27881.
+        class CustomStr(str):
+            def upper(self):
+                return None
+            def __del__(self):
+                con.isolation_level = ""
+
+        con = sqlite.connect(":memory:")
+        con.isolation_level = None
+        for level in "", "DEFERRED", "IMMEDIATE", "EXCLUSIVE":
+            with self.subTest(level=level):
+                con.isolation_level = level
+                con.isolation_level = level.lower()
+                con.isolation_level = level.capitalize()
+                con.isolation_level = CustomStr(level)
+
+        # setting isolation_level failure should not alter previous state
+        con.isolation_level = None
+        con.isolation_level = "DEFERRED"
+        pairs = [
+            (1, TypeError), (b'', TypeError), ("abc", ValueError),
+            ("IMMEDIATE\0EXCLUSIVE", ValueError), ("\xe9", ValueError),
+        ]
+        for value, exc in pairs:
+            with self.subTest(level=value):
+                with self.assertRaises(exc):
+                    con.isolation_level = value
+                self.assertEqual(con.isolation_level, "DEFERRED")
+
+    def test_cursor_constructor_call_check(self):
+        """
+        Verifies that cursor methods check whether base class __init__ was
+        called.
+        """
+        class Cursor(sqlite.Cursor):
+            def __init__(self, con):
+                pass
+
+        con = sqlite.connect(":memory:")
+        cur = Cursor(con)
+        with self.assertRaises(sqlite.ProgrammingError):
+            cur.execute("select 4+5").fetchall()
+        with self.assertRaisesRegex(sqlite.ProgrammingError,
+                                    r'^Base Cursor\.__init__ not called\.$'):
+            cur.close()
+
+    def test_str_subclass(self):
+        """
+        The Python 3.0 port of the module didn't cope with values of subclasses of str.
+        """
+        class MyStr(str): pass
+        self.con.execute("select ?", (MyStr("abc"),))
+
+    def test_connection_constructor_call_check(self):
+        """
+        Verifies that connection methods check whether base class __init__ was
+        called.
+        """
+        class Connection(sqlite.Connection):
+            def __init__(self, name):
+                pass
+
+        con = Connection(":memory:")
+        with self.assertRaises(sqlite.ProgrammingError):
+            cur = con.cursor()
+
+    def test_cursor_registration(self):
+        """
+        Verifies that subclassed cursor classes are correctly registered with
+        the connection object, too.  (fetch-across-rollback problem)
+        """
+        class Connection(sqlite.Connection):
+            def cursor(self):
+                return Cursor(self)
+
+        class Cursor(sqlite.Cursor):
+            def __init__(self, con):
+                sqlite.Cursor.__init__(self, con)
+
+        con = Connection(":memory:")
+        cur = con.cursor()
+        cur.execute("create table foo(x)")
+        cur.executemany("insert into foo(x) values (?)", [(3,), (4,), (5,)])
+        cur.execute("select x from foo")
+        con.rollback()
+        with self.assertRaises(sqlite.InterfaceError):
+            cur.fetchall()
+
+    def test_auto_commit(self):
+        """
+        Verifies that creating a connection in autocommit mode works.
+        2.5.3 introduced a regression so that these could no longer
+        be created.
+        """
+        con = sqlite.connect(":memory:", isolation_level=None)
+
+    def test_pragma_autocommit(self):
+        """
+        Verifies that running a PRAGMA statement that does an autocommit does
+        work. This did not work in 2.5.3/2.5.4.
+        """
+        cur = self.con.cursor()
+        cur.execute("create table foo(bar)")
+        cur.execute("insert into foo(bar) values (5)")
+
+        cur.execute("pragma page_size")
+        row = cur.fetchone()
+
+    def test_connection_call(self):
+        """
+        Call a connection with a non-string SQL request: check error handling
+        of the statement constructor.
+        """
+        self.assertRaises(TypeError, self.con, b"select 1")
+
+    def test_collation(self):
+        def collation_cb(a, b):
+            return 1
+        self.assertRaises(UnicodeEncodeError, self.con.create_collation,
+            # Lone surrogate cannot be encoded to the default encoding (utf8)
+            "\uDC80", collation_cb)
+
+    def test_recursive_cursor_use(self):
+        """
+        http://bugs.python.org/issue10811
+
+        Recursively using a cursor, such as when reusing it from a generator led to segfaults.
+        Now we catch recursive cursor usage and raise a ProgrammingError.
+        """
+        con = sqlite.connect(":memory:")
+
+        cur = con.cursor()
+        cur.execute("create table a (bar)")
+        cur.execute("create table b (baz)")
+
+        def foo():
+            cur.execute("insert into a (bar) values (?)", (1,))
+            yield 1
+
+        with self.assertRaises(sqlite.ProgrammingError):
+            cur.executemany("insert into b (baz) values (?)",
+                            ((i,) for i in foo()))
+
+    def test_convert_timestamp_microsecond_padding(self):
+        """
+        http://bugs.python.org/issue14720
+
+        The microsecond parsing of convert_timestamp() should pad with zeros,
+        since the microsecond string "456" actually represents "456000".
+        """
+
+        con = sqlite.connect(":memory:", detect_types=sqlite.PARSE_DECLTYPES)
+        cur = con.cursor()
+        cur.execute("CREATE TABLE t (x TIMESTAMP)")
+
+        # Microseconds should be 456000
+        cur.execute("INSERT INTO t (x) VALUES ('2012-04-04 15:06:00.456')")
+
+        # Microseconds should be truncated to 123456
+        cur.execute("INSERT INTO t (x) VALUES ('2012-04-04 15:06:00.123456789')")
+
+        cur.execute("SELECT * FROM t")
+        values = [x[0] for x in cur.fetchall()]
+
+        self.assertEqual(values, [
+            datetime.datetime(2012, 4, 4, 15, 6, 0, 456000),
+            datetime.datetime(2012, 4, 4, 15, 6, 0, 123456),
+        ])
+
+    def test_invalid_isolation_level_type(self):
+        # isolation level is a string, not an integer
+        self.assertRaises(TypeError,
+                          sqlite.connect, ":memory:", isolation_level=123)
+
+
+    def test_null_character(self):
+        # Issue #21147
+        con = sqlite.connect(":memory:")
+        self.assertRaises(ValueError, con, "\0select 1")
+        self.assertRaises(ValueError, con, "select 1\0")
+        cur = con.cursor()
+        self.assertRaises(ValueError, cur.execute, " \0select 2")
+        self.assertRaises(ValueError, cur.execute, "select 2\0")
+
+    def test_surrogates(self):
+        con = sqlite.connect(":memory:")
+        self.assertRaises(UnicodeEncodeError, con, "select '\ud8ff'")
+        self.assertRaises(UnicodeEncodeError, con, "select '\udcff'")
+        cur = con.cursor()
+        self.assertRaises(UnicodeEncodeError, cur.execute, "select '\ud8ff'")
+        self.assertRaises(UnicodeEncodeError, cur.execute, "select '\udcff'")
+
+    @unittest.skipUnless(sys.maxsize > 2**32, 'requires 64bit platform')
+    @support.bigmemtest(size=2**31, memuse=4, dry_run=False)
+    def test_large_sql(self, maxsize):
+        # Test two cases: size+1 > INT_MAX and size+1 <= INT_MAX.
+        for size in (2**31, 2**31-2):
+            con = sqlite.connect(":memory:")
+            sql = "select 1".ljust(size)
+            self.assertRaises(sqlite.DataError, con, sql)
+            cur = con.cursor()
+            self.assertRaises(sqlite.DataError, cur.execute, sql)
+            del sql
+
+    def test_commit_cursor_reset(self):
+        """
+        Connection.commit() did reset cursors, which made sqlite3
+        to return rows multiple times when fetched from cursors
+        after commit. See issues 10513 and 23129 for details.
+        """
+        con = sqlite.connect(":memory:")
+        con.executescript("""
+        create table t(c);
+        create table t2(c);
+        insert into t values(0);
+        insert into t values(1);
+        insert into t values(2);
+        """)
+
+        self.assertEqual(con.isolation_level, "")
+
+        counter = 0
+        for i, row in enumerate(con.execute("select c from t")):
+            with self.subTest(i=i, row=row):
+                con.execute("insert into t2(c) values (?)", (i,))
+                con.commit()
+                if counter == 0:
+                    self.assertEqual(row[0], 0)
+                elif counter == 1:
+                    self.assertEqual(row[0], 1)
+                elif counter == 2:
+                    self.assertEqual(row[0], 2)
+                counter += 1
+        self.assertEqual(counter, 3, "should have returned exactly three rows")
+
+    def test_bpo31770(self):
+        """
+        The interpreter shouldn't crash in case Cursor.__init__() is called
+        more than once.
+        """
+        def callback(*args):
+            pass
+        con = sqlite.connect(":memory:")
+        cur = sqlite.Cursor(con)
+        ref = weakref.ref(cur, callback)
+        cur.__init__(con)
+        del cur
+        # The interpreter shouldn't crash when ref is collected.
+        del ref
+        support.gc_collect()
+
+    def test_del_isolation_level_segfault(self):
+        with self.assertRaises(AttributeError):
+            del self.con.isolation_level
+
+    def test_bpo37347(self):
+        class Printer:
+            def log(self, *args):
+                return sqlite.SQLITE_OK
+
+        for method in [self.con.set_trace_callback,
+                       functools.partial(self.con.set_progress_handler, n=1),
+                       self.con.set_authorizer]:
+            printer_instance = Printer()
+            method(printer_instance.log)
+            method(printer_instance.log)
+            self.con.execute("select 1")  # trigger seg fault
+            method(None)
+
+    def test_return_empty_bytestring(self):
+        cur = self.con.execute("select X''")
+        val = cur.fetchone()[0]
+        self.assertEqual(val, b'')
+
+
+if __name__ == "__main__":
+    unittest.main()