Calling eth_signTypedData_v4 using @openzeppelin/test-environment

I am trying to write Unit Tests for testing Signing and Verification of data payloads using eth_signTypedData_v4 .

In my unit test i write Typescript code to sign the data, and then pass that signature to the SmartContract wherein I attempt to verify it. But I am unable to sign the data in the first place using the web3 provided by @openzeppelin/test-environment.

Here is my code inside my Unit test to try and sign it.

import { accounts, contract, web3 } from "@openzeppelin/test-environment";
  async function signVoucher(payload: any, signerAddress: string) {
    return new Promise((resolve, reject) => {
      (web3.currentProvider as any).send(
          method: "eth_signTypedData_v4",
          params: [signerAddress, payload],
        (err: any, res: any) => {
          if (err) {
          } else {
            console.log("Signature :", res);

This is the error I get:

error: {
        message: 'Method eth_signTypedData_v4 not supported.',
        code: -32000,
        data: {
          stack: 'Error: Method eth_signTypedData_v4 not supported.\n' +
          name: 'Error'

This is the version of my modules:

    "@openzeppelin/test-environment": "0.1.9",
    "@openzeppelin/test-helpers": "0.5.15",

How do I call eth_signTypedData_v4 from within my Unit Tests ?


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@openzeppelin/test-environment has been deprecated a long time ago. It is no longer maintained, and you should not be using it.