Reset Transactions After Completing the Test
To address the isolation issue, we can use a custom JSON RPC:
evm_snapshot to create a snapshot to the point before the actual test execution (beforeEach). This call gives us an ID of the snapshot (stored in snap). You can think of it as a pointer to a particular point on the chain.After the test is complete (in
afterEach), we invoke the evm_revert and pass it to the snapshot ID:1
import { fail } from "assert";
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import { expect } from "chai";
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import { Greeter } from "../typechain";
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import { forkAndDeployGreeter } from "./utils";
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import { EthersOnTenderlyFork } from "./utils/tenderly/fork";
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describe("Deploy before tests forget execution", function () {
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let greeter: Greeter;
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let fork: EthersOnTenderlyFork;
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let snap: null | string = null;
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before(("Deploy contract once"), async () => {
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const forkAndContract = await forkAndDeployGreeter()
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greeter = forkAndContract.greeter;
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fork = forkAndContract.fork;
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});
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beforeEach(async () => {
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snap = await fork.provider.send("evm_snapshot", []);
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})
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afterEach(async () => {
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await fork.provider.send("evm_revert", [snap]);
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})
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it("Should change the greeting message", async () => {
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await (
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await greeter
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.connect(fork.signers[2])
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.setGreeting("Bonjour le monde!")
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).wait();
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expect(await greeter.greet()).to.equal("Bonjour le monde!");
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})
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it("Should see message specified by the last executed test", async () => {
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expect(await greeter.greet()).to.equal("Hello, world!");
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});
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});
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