@ensdomains/hardhat-chai-matchers-viem
v0.0.8
Published
## This plugin is based on the existing `@nomicfoundation/hardhat-chai-matchers`. If you are using ethers, you should use that instead.
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hardhat-chai-matchers-viem
This plugin is based on the existing @nomicfoundation/hardhat-chai-matchers
. If you are using ethers, you should use that instead.
Installation
bun add @ensdomains/hardhat-chai-matchers-viem
In your hardhat config:
import("@ensdomains/hardhat-chai-matchers-viem");
Getting started
Deploy contracts with deployContract
and pass them into expect
to use matchers from this plugin:
import { expect } from "chai";
import hre from "hardhat";
it("works", async () => {
const example = await hre.viem.deployContract("ExampleContract", []);
await expect(example)
.write("revertWithSomeCustomError")
.toBeRevertedWithCustomError("SomeCustomError");
});
To speed up tests, you should use hardhat fixtures:
import { loadFixture } from "@nomicfoundation/hardhat-network-helpers";
import { expect } from "chai";
import hre from "hardhat";
async function deployExample() {
const example = await hre.viem.deployContract("ExampleContract", []);
return example;
}
it("works", async () => {
const example = await loadFixture(deployExample);
await expect(example)
.write("revertWithSomeCustomError")
.toBeRevertedWithCustomError("SomeCustomError");
});
Available matchers
expect(contract).read(...)
expect(contract).write(...)
expect(contract).transaction(...)
.toBeReverted()
.toBeRevertedWithCustomError(...)
.withArgs(...)
.toBeRevertedWithoutReason()
.toBeRevertedWithPanic(...)
.toBeRevertedWithString(...)
.toEmitEvent(...)
.withArgs(...)
.toEmitEventFrom(...)
.withArgs(...)