def testRunSelfReferencingVariable(self):
root = Node("=")
root.left = Node("y")
root.right = Node("+")
root.right.left = Node("y")
root.right.right = Node("3")
program = Program(root)
result = program.run({"y": 2})
self.assertEqual(result["y"], 5)
def testRun(self):
root = Node("=")
root.left = Node("y")
root.right = Node("+")
root.right.left = Node("x")
root.right.right = Node("4")
program = Program(root)
result = program.run({"x": 3})
self.assertEqual(result["x"], 3)
self.assertEqual(result["y"], 7)
