Multi test example

contracts/cw20-escrow/Cargo.toml

@@ -29,3 +29,5 @@ thiserror = { version = "1.0.20" }
 
 [dev-dependencies]
 cosmwasm-schema = { version = "0.12.0-alpha2" }
+cw-multi-test = { path = "../../packages/multi-test", version = "0.3.2" }
+cw20-base = { path = "../cw20-base", version = "0.3.2", features = ["library"] }

contracts/cw20-escrow/src/integration_test.rs

@@ -0,0 +1,141 @@
+#![cfg(test)]
+
+use cosmwasm_std::testing::{mock_env, MockApi, MockStorage};
+use cosmwasm_std::{coins, to_binary, HumanAddr, Uint128};
+use cw20::{Cw20CoinHuman, Cw20Contract, Cw20HandleMsg};
+use cw_multi_test::{Contract, ContractWrapper, Router, SimpleBank};
+
+use crate::msg::{CreateMsg, DetailsResponse, HandleMsg, InitMsg, QueryMsg, ReceiveMsg};
+
+fn mock_router() -> Router {
+    let env = mock_env();
+    let api = Box::new(MockApi::default());
+    let bank = SimpleBank {};
+
+    Router::new(api, env.block, bank, || Box::new(MockStorage::new()))
+}
+
+pub fn contract_escrow() -> Box<dyn Contract> {
+    let contract = ContractWrapper::new(
+        crate::contract::handle,
+        crate::contract::init,
+        crate::contract::query,
+    );
+    Box::new(contract)
+}
+
+pub fn contract_cw20() -> Box<dyn Contract> {
+    let contract = ContractWrapper::new(
+        cw20_base::contract::handle,
+        cw20_base::contract::init,
+        cw20_base::contract::query,
+    );
+    Box::new(contract)
+}
+
+#[test]
+// receive cw20 tokens and release upon approval
+fn escrow_happy_path_cw20_tokens() {
+    let mut router = mock_router();
+
+    // set personal balance
+    let owner = HumanAddr::from("owner");
+    let init_funds = coins(2000, "btc");
+    router
+        .set_bank_balance(owner.clone(), init_funds.clone())
+        .unwrap();
+
+    // set up cw20 contract with some tokens
+    let cw20_id = router.store_code(contract_cw20());
+    let msg = cw20_base::msg::InitMsg {
+        name: "Cash Money".to_string(),
+        symbol: "CASH".to_string(),
+        decimals: 2,
+        initial_balances: vec![Cw20CoinHuman {
+            address: owner.clone(),
+            amount: Uint128(5000),
+        }],
+        mint: None,
+    };
+    let cash_addr = router
+        .instantiate_contract(cw20_id, &owner, &msg, &[], "CASH")
+        .unwrap();
+
+    // set up reflect contract
+    let escrow_id = router.store_code(contract_escrow());
+    let escrow_addr = router
+        .instantiate_contract(escrow_id, &owner, &InitMsg {}, &[], "Escrow")
+        .unwrap();
+
+    // they are different
+    assert_ne!(cash_addr, escrow_addr);
+
+    // set up cw20 helpers
+    let cash = Cw20Contract(cash_addr.clone());
+
+    // ensure our balances
+    let owner_balance = cash.balance(&router, owner.clone()).unwrap();
+    assert_eq!(owner_balance, Uint128(5000));
+    let escrow_balance = cash.balance(&router, escrow_addr.clone()).unwrap();
+    assert_eq!(escrow_balance, Uint128(0));
+
+    // send some tokens to create an escrow
+    let arb = HumanAddr::from("arbiter");
+    let ben = HumanAddr::from("beneficiary");
+    let id = "demo".to_string();
+    let create_msg = ReceiveMsg::Create(CreateMsg {
+        id: id.clone(),
+        arbiter: arb.clone(),
+        recipient: ben.clone(),
+        end_height: None,
+        end_time: None,
+        cw20_whitelist: None,
+    });
+    let create_bin = to_binary(&create_msg).unwrap();
+    let send_msg = Cw20HandleMsg::Send {
+        contract: escrow_addr.clone(),
+        amount: Uint128(1200),
+        msg: Some(create_bin),
+    };
+    let res = router
+        .execute_contract(&cash_addr, &owner, &send_msg, &[])
+        .unwrap();
+    println!("{:?}", res.attributes);
+    assert_eq!(6, res.attributes.len());
+
+    // ensure balances updated
+    let owner_balance = cash.balance(&router, owner.clone()).unwrap();
+    assert_eq!(owner_balance, Uint128(3800));
+    let escrow_balance = cash.balance(&router, escrow_addr.clone()).unwrap();
+    assert_eq!(escrow_balance, Uint128(1200));
+
+    // ensure escrow properly created
+    let details: DetailsResponse = router
+        .wrap()
+        .query_wasm_smart(&escrow_addr, &QueryMsg::Details { id: id.clone() })
+        .unwrap();
+    assert_eq!(id, details.id);
+    assert_eq!(arb, details.arbiter);
+    assert_eq!(ben, details.recipient);
+    assert_eq!(
+        vec![Cw20CoinHuman {
+            address: cash_addr.clone(),
+            amount: Uint128(1200)
+        }],
+        details.cw20_balance
+    );
+
+    // release escrow
+    let approve_msg = HandleMsg::Approve { id: id.clone() };
+    let _ = router
+        .execute_contract(&escrow_addr, &arb, &approve_msg, &[])
+        .unwrap();
+
+    // ensure balances updated - release to ben
+    let owner_balance = cash.balance(&router, owner.clone()).unwrap();
+    assert_eq!(owner_balance, Uint128(3800));
+    let escrow_balance = cash.balance(&router, escrow_addr.clone()).unwrap();
+    assert_eq!(escrow_balance, Uint128(0));
+    let ben_balance = cash.balance(&router, ben.clone()).unwrap();
+    assert_eq!(ben_balance, Uint128(1200));
+}

contracts/cw20-escrow/src/lib.rs

@@ -1,5 +1,6 @@
 pub mod contract;
 mod error;
+mod integration_test;
 pub mod msg;
 pub mod state;
 

packages/multi-test/src/wasm.rs

@@ -35,30 +35,33 @@ type QueryFn<T, E> = fn(deps: Deps, env: Env, msg: T) -> Result<Binary, E>;
 
 /// Wraps the exported functions from a contract and provides the normalized format
 /// TODO: Allow to customize return values (CustomMsg beyond Empty)
-/// TODO: Allow different error types?
-pub struct ContractWrapper<T1, T2, T3, E>
+pub struct ContractWrapper<T1, T2, T3, E1, E2, E3>
 where
     T1: DeserializeOwned,
     T2: DeserializeOwned,
     T3: DeserializeOwned,
-    E: std::fmt::Display,
+    E1: std::fmt::Display,
+    E2: std::fmt::Display,
+    E3: std::fmt::Display,
 {
-    handle_fn: ContractFn<T1, HandleResponse, E>,
-    init_fn: ContractFn<T2, InitResponse, E>,
-    query_fn: QueryFn<T3, E>,
+    handle_fn: ContractFn<T1, HandleResponse, E1>,
+    init_fn: ContractFn<T2, InitResponse, E2>,
+    query_fn: QueryFn<T3, E3>,
 }
 
-impl<T1, T2, T3, E> ContractWrapper<T1, T2, T3, E>
+impl<T1, T2, T3, E1, E2, E3> ContractWrapper<T1, T2, T3, E1, E2, E3>
 where
     T1: DeserializeOwned,
     T2: DeserializeOwned,
     T3: DeserializeOwned,
-    E: std::fmt::Display,
+    E1: std::fmt::Display,
+    E2: std::fmt::Display,
+    E3: std::fmt::Display,
 {
     pub fn new(
-        handle_fn: ContractFn<T1, HandleResponse, E>,
-        init_fn: ContractFn<T2, InitResponse, E>,
-        query_fn: QueryFn<T3, E>,
+        handle_fn: ContractFn<T1, HandleResponse, E1>,
+        init_fn: ContractFn<T2, InitResponse, E2>,
+        query_fn: QueryFn<T3, E3>,
     ) -> Self {
         ContractWrapper {
             handle_fn,
@@ -68,12 +71,14 @@ where
     }
 }
 
-impl<T1, T2, T3, E> Contract for ContractWrapper<T1, T2, T3, E>
+impl<T1, T2, T3, E1, E2, E3> Contract for ContractWrapper<T1, T2, T3, E1, E2, E3>
 where
     T1: DeserializeOwned,
     T2: DeserializeOwned,
     T3: DeserializeOwned,
-    E: std::fmt::Display,
+    E1: std::fmt::Display,
+    E2: std::fmt::Display,
+    E3: std::fmt::Display,
 {
     fn handle(
         &self,
@@ -311,7 +316,8 @@ impl<'a> WasmCache<'a> {
     // TODO: better addr generation
     fn next_address(&self) -> HumanAddr {
         let count = self.router.contracts.len() + self.state.contracts.len();
-        HumanAddr::from(count.to_string())
+        // we make this longer so it is not rejected by tests
+        HumanAddr::from("Contract #".to_string() + &count.to_string())
     }
 
     pub fn handle(