To facilitate account impersonation, the Rust SDK provides the FakeSigner. We can use it to simulate ownership of assets held by an account with a given address. This also implies that we can impersonate contract calls from that address. A wallet with a FakeSigner will only succeed in unlocking assets if the network is set up with utxo_validation = false.
let node_config = NodeConfig {
utxo_validation: false,
..Default::default()
};let provider = setup_test_provider(coins, vec![], Some(node_config), None).await?;// create impersonator for an address
let fake_signer = FakeSigner::new(some_address);
let impersonator = Wallet::new(fake_signer, provider.clone());
let contract_instance = MyContract::new(contract_id, impersonator.clone());
let response = contract_instance
.methods()
.initialize_counter(42)
.call()
.await?;
assert_eq!(42, response.value);