def testCanReadAndWriteBasics(self):
path = TempDir() + "/ring"
ringfile = Ringfile.create(path, 1024)
ringfile.write("Hello, World!")
ringfile.close()
ringfile = Ringfile(path, MODE_APPEND)
ringfile.write("Goodbye, World!")
ringfile.close()
ringfile = Ringfile(path, MODE_READ)
self.assertEqual("Hello, World!", ringfile.read())
self.assertEqual("Goodbye, World!", ringfile.read())
self.assertEqual(None, ringfile.read())
def testCannotOpenBogusPath(self):
path = TempDir() + "/does not exist/ring"
with self.assertRaises(IOError):
Ringfile.create(path, 1000)
with self.assertRaises(IOError):
Ringfile(path, MODE_READ)
with self.assertRaises(IOError):
Ringfile(path, MODE_APPEND)
path = TempDir() + "/ring"
with self.assertRaises(IOError):
Ringfile(path, MODE_READ)
with self.assertRaises(IOError):
Ringfile(path, MODE_APPEND)
def testCanIterate(self):
path = TempDir() + "/ring"
ringfile = Ringfile.create(path, 1024)
ringfile.write("Hello, World!")
ringfile.close()
ringfile = Ringfile(path, MODE_APPEND)
ringfile.write("Goodbye, World!")
ringfile.close()
records = list(Ringfile(path, MODE_READ))
self.assertEqual(["Hello, World!", "Goodbye, World!"], records)
