As per the official documentation, assert.rejects was added since Node v10.0.0.

Also, the node console confirms that:

enter image description here

even though, truffle test throws this error:

 TypeError: assert.rejects is not a function

Because I wrote this snippet in my unit-tests:

  await assert.rejects(async () => {
    await this.contract.createToken(...info, 1, {from: accounts[0]});

Fixed by importing assert explicitly at the top of the test file:

const assert = require('assert');

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