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/// Enum-based state machine stored in contract storage.
enum OrderStatus {
Created,
Confirmed,
Shipped,
Delivered,
Cancelled,
}
msg OrderMsg {
#[selector = 0x01]
Confirm -> u256,
#[selector = 0x02]
Ship -> u256,
#[selector = 0x03]
Deliver -> u256,
#[selector = 0x04]
Cancel -> u256,
#[selector = 0x05]
Which -> u256,
}
struct OrderStore {
status: OrderStatus,
}
pub contract Order {
mut store: OrderStore
init() uses (mut store) {
store.status = OrderStatus::Created
}
recv OrderMsg {
Confirm -> u256 uses (mut store) {
match store.status {
OrderStatus::Created => {
store.status = OrderStatus::Confirmed
return 0
}
_ => {
return 1
}
}
}
Ship -> u256 uses (mut store) {
match store.status {
OrderStatus::Confirmed => {
store.status = OrderStatus::Shipped
return 0
}
_ => {
return 1
}
}
}
Deliver -> u256 uses (mut store) {
match store.status {
OrderStatus::Shipped => {
store.status = OrderStatus::Delivered
return 0
}
_ => {
return 1
}
}
}
Cancel -> u256 uses (mut store) {
match store.status {
OrderStatus::Created => {
store.status = OrderStatus::Cancelled
return 0
}
OrderStatus::Confirmed => {
store.status = OrderStatus::Cancelled
return 0
}
_ => {
return 1
}
}
}
Which -> u256 uses (store) {
match store.status {
OrderStatus::Created => 0,
OrderStatus::Confirmed => 1,
OrderStatus::Shipped => 2,
OrderStatus::Delivered => 3,
OrderStatus::Cancelled => 4,
}
}
}
}
#[test]
fn test_order_initial_state() uses (evm: mut Evm) {
let order = evm.create2<Order>(value: 0, args: (), salt: 0)
assert!(order.inner != 0)
let s: u256 = evm.call(addr: order, gas: 100000, value: 0, message: OrderMsg::Which {})
assert!(s == 0)
let r: u256 = evm.call(addr: order, gas: 100000, value: 0, message: OrderMsg::Confirm {})
assert!(r == 0)
}
#[test]
fn test_order_lifecycle() uses (evm: mut Evm) {
let order = evm.create2<Order>(value: 0, args: (), salt: 0)
assert!(order.inner != 0)
let s: u256 = evm.call(addr: order, gas: 100000, value: 0, message: OrderMsg::Which {})
assert!(s == 0)
// Created -> Confirmed
let r: u256 = evm.call(addr: order, gas: 100000, value: 0, message: OrderMsg::Confirm {})
assert!(r == 0)
let s: u256 = evm.call(addr: order, gas: 100000, value: 0, message: OrderMsg::Which {})
assert!(s == 1)
// Confirmed -> Shipped
let r: u256 = evm.call(addr: order, gas: 100000, value: 0, message: OrderMsg::Ship {})
assert!(r == 0)
let s: u256 = evm.call(addr: order, gas: 100000, value: 0, message: OrderMsg::Which {})
assert!(s == 2)
// Shipped -> Delivered
let r: u256 = evm.call(addr: order, gas: 100000, value: 0, message: OrderMsg::Deliver {})
assert!(r == 0)
let s: u256 = evm.call(addr: order, gas: 100000, value: 0, message: OrderMsg::Which {})
assert!(s == 3)
// Can't go backwards
let r: u256 = evm.call(addr: order, gas: 100000, value: 0, message: OrderMsg::Confirm {})
assert!(r == 1)
}
#[test]
fn test_order_cancellation() uses (evm: mut Evm) {
let order = evm.create2<Order>(value: 0, args: (), salt: 1)
assert!(order.inner != 0)
let r: u256 = evm.call(addr: order, gas: 100000, value: 0, message: OrderMsg::Cancel {})
assert!(r == 0)
let s: u256 = evm.call(addr: order, gas: 100000, value: 0, message: OrderMsg::Which {})
assert!(s == 4)
}