As noted in the testing intro, you are free to test your Sway and TS-SDK code with any JS framework available. Below we have an example of how to load and test a contract using Jest, but the general principles and steps are the same for any testing harness.
Here is a simple Sway program that takes an input and then returns it:
contract;
abi DemoContract {
fn return_input(input: u64) -> u64;
}
impl DemoContract for Contract {
fn return_input(input: u64) -> u64 {
input
}
}Here is JavaScript code testing the above program using a conventional Jest setup:
import { generateTestWallet } from '@fuel-ts/wallet/test-utils';
import { ContractFactory, Provider, toHex, BaseAssetId } from 'fuels';
import storageSlots from '../contract/out/debug/demo-contract-storage_slots.json';
import { DemoContractAbi__factory } from './generated-types';
import bytecode from './generated-types/DemoContractAbi.hex';
describe('ExampleContract', () => {
it('should return the input', async () => {
const provider = new Provider('http://127.0.0.1:4000/graphql');
const wallet = await generateTestWallet(provider, [[1_000, BaseAssetId]]);
// Deploy
const factory = new ContractFactory(bytecode, DemoContractAbi__factory.abi, wallet);
const contract = await factory.deployContract();
// Call
const { value } = await contract.functions.return_input(1337).call();
// Assert
expect(value.toHex()).toEqual(toHex(1337));
// You can also make a call using the factory
const contractInstance = DemoContractAbi__factory.connect(contract.id, wallet);
const { value: v2 } = await contractInstance.functions.return_input(1337).call();
expect(v2.toHex()).toBe(toHex(1337));
});
it('deployContract method', async () => {
const provider = new Provider('http://127.0.0.1:4000/graphql');
const wallet = await generateTestWallet(provider, [[1_000, BaseAssetId]]);
// Deploy
const contract = await DemoContractAbi__factory.deployContract(bytecode, wallet, {
storageSlots,
});
// Call
const { value } = await contract.functions.return_input(1337).call();
// Assert
expect(value.toHex()).toEqual(toHex(1337));
});
});