def test_usage(self):
book = sourcemap.Bookkeeper()
book.foo = 123
self.assertEqual(book.foo, 0)
self.assertEqual(book.foo, 0)
self.assertEqual(book._foo, 123)
book.foo = 124
self.assertEqual(book.foo, 1)
self.assertEqual(book.foo, 1)
self.assertEqual(book._foo, 124)
book.foo = 1
self.assertEqual(book.foo, -123)
self.assertEqual(book.foo, -123)
self.assertEqual(book._foo, 1)
book.foo = 1
self.assertEqual(book.foo, 0)
self.assertEqual(book.foo, 0)
self.assertEqual(book._foo, 1)
book.foo = 1
self.assertEqual(book.foo, 0)
self.assertEqual(book.foo, 0)
self.assertEqual(book._foo, 1)
book.foo = 2
book.foo = 2
self.assertEqual(book.foo, 0)
self.assertEqual(book._foo, 2)
def test_del_reset(self):
book = sourcemap.Bookkeeper()
book.foo = 123
book.foo = 124
self.assertEqual(book.foo, 1)
del book.foo
self.assertEqual(book.foo, 0)
def test_empty(self):
book = sourcemap.Bookkeeper()
with self.assertRaises(AttributeError) as e:
book.foo
self.assertEqual(
e.exception.args[0], "'Bookkeeper' object has no attribute 'foo'")
with self.assertRaises(AttributeError) as e:
del book.foo
def test_private_reset(self):
book = sourcemap.Bookkeeper()
book.foo = 123
book.foo = 124
self.assertEqual(book.foo, 1)
book._foo = 1
self.assertEqual(book.foo, 0)
self.assertEqual(book._foo, 1)
book._foo = 124
self.assertEqual(book.foo, 0)
self.assertEqual(book._foo, 124)
def test_typecheck(self):
book = sourcemap.Bookkeeper()
with self.assertRaises(TypeError) as e:
book.foo = 'notanint'
self.assertEqual(
e.exception.args[0], "assignment must be of type 'int'")
