Use TESTFN iso. hard-coded test file paths in sqlite3 tests

[erlend-aasland]

Current code:

cpython/Lib/test/test_sqlite3/test_transactions.py

Lines 28 to 54 in 5bcf33d

	def get_db_path():
	return "sqlite_testdb"
	class TransactionTests(unittest.TestCase):
	def setUp(self):
	try:
	os.remove(get_db_path())
	except OSError:
	pass
	self.con1 = sqlite.connect(get_db_path(), timeout=0.1)
	self.cur1 = self.con1.cursor()
	self.con2 = sqlite.connect(get_db_path(), timeout=0.1)
	self.cur2 = self.con2.cursor()
	def tearDown(self):
	self.cur1.close()
	self.con1.close()
	self.cur2.close()
	self.con2.close()
	try:
	os.unlink(get_db_path())
	except OSError:
	pass

Suggesting to use the test.support helpers TESTFN and unlink.

[erlend-aasland]

We can also swap the timeout with one of the timeout constants in test.support.