To demonstrate how to develop DApps on Script using the Hardhat suite (https://hardhat.org/hardhat-runner/docs/getting-started#overview). This guide will walk you through the steps to deploy and test on Script using Hardhat and ethers.js (https://docs.ethers.org/v6/).

Setup the Hardhat project

Fund the test accounts with some SPAY

Execute the two commands below to fun the test accounts with some SPAY:

export SEQ=scriptcli query account --address=0x2E833968E5bB786Ae419c4d13189fB081Cc43bab | grep sequence | grep -o '[[:digit:]]\+'

scriptcli tx send --chain="scriptnet" --from=0x2E833968E5bB786Ae419c4d13189fB081Cc43bab --to=0x19E7E376E7C213B7E7e7e46cc70A5dD086DAff2A --spay=1000 --password=qwertyuiop --seq=$(($SEQ+1))

scriptcli tx send --chain="scriptnet" --from=0x2E833968E5bB786Ae419c4d13189fB081Cc43bab --to=0x1563915e194D8CfBA1943570603F7606A3115508 --spay=1000 --password=qwertyuiop --seq=$(($SEQ+2))

Deploy the contract to the script testnet

First, edit the hardhat.config.js file, replace "11...1" with the actual private key of the deployer wallet (should delete the key after use, do NOT commit the private key to GitHub):


script_testnet: {

url: https://testeth-rpc-api.script.tv/rpc,

accounts: ["1111111111111111111111111111111111111111111111111111111111111111"],

chainId: 742,

gasPrice: 4000000000000 }, ...

Next, go to the repository's root folder and run this to deploy your contract:

npx hardhat run scripts/deploy.js --network script_testnet

Special Notes on Testing with the Ethers.js+Waffle framework

Note 1: Currently the RPC Adaptor does NOT support non-standard methods such as evm_snapshot, evm_revert, and evm_mine. Thus, test cases using Fixtures (e.g. waffle.loadFixture()) are expected to fail when running against the Script blockchain.

Note 2: Currently the RPC Adaptor returns a generic "evm: execution reverted" messages in most case when the Script EVM execution fails. Some test cases may check the EVM errors with code like this:

await expect(this.bar.leave("200")).to.be.revertedWith("ERC20: burn amount exceeds balance")

To make these test pass, for now we need to replace the expected error message with "evm: execution reverted" as shown below:

await expect(this.bar.leave("200")).to.be.revertedWith("evm: execution reverted")

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