def test_init_node(self):
"""
Tests initialization of Node
"""
n1 = Node('data')
self.assertIsInstance(n1, Node)
self.assertEqual(n1.data, 'data')
self.assertIsNone(n1.left)
self.assertIsNone(n1.right)
# make sure 'value' is writeable
n1.data = "new_val"
self.assertEqual(n1.data, 'new_val')
