Basic Example

Let's use launchTestNode with the counter contract from the Fuel dApp tutorial.

Note: you will have to change the import paths of the contract factory and bytecode to match your folder structure.

import { CounterFactory } from '../typegend/contracts/CounterFactory';

using launchedContractNode = await launchTestNode({
  contractsConfigs: [{ factory: CounterFactory }],
});

const {
  contracts: [contract],
  provider,
  wallets,
} = launchedContractNode;

const { waitForResult } = await contract.functions.get_count().call();
const response = await waitForResult();

console.assert(response.value.toNumber() === 0, 'Counter is not initialized');
console.assert(provider instanceof Provider, 'Provider is not instance of Provider');
console.assert(wallets.length === 4, 'Wallets length is not 4');

See code in context

Summary

1. The launched variable was instantiated with the using keyword.
2. launchTestNode spun up a short-lived fuel-core node, deployed a contract to it and returned it for testing.
3. The deployed contract is fully typesafe because of launchTestNode's type-level integration with typegen outputs.
4. Besides the contract, you've got the provider and wallets at your disposal.