Snippet for https://github.com/nodejs/node/issues/15055

test-assert-throws.js

'use strict'
const assert = require('assert');

class ExtendableError extends Error {
  constructor(message = '') {
    super(message);

    // extending Error is weird and does not propagate `message`
    Object.defineProperty(this, 'message', {
      configurable: true,
      enumerable : false,
      value : message,
      writable : true,
    });

    Object.defineProperty(this, 'name', {
      configurable: true,
      enumerable : false,
      value : this.constructor.name,
      writable : true,
    });

    if (Error.hasOwnProperty('captureStackTrace')) {
      Error.captureStackTrace(this, this.constructor);
      return;
    }

    Object.defineProperty(this, 'stack', {
      configurable: true,
      enumerable : false,
      value : (new Error(message)).stack,
      writable : true,
    });
  }
}

class CustomError extends ExtendableError {
  constructor(message, httpStatusCode, data) {
    super(message);
    this.httpStatusCode = httpStatusCode;
    this.data = data;
  }

  toString() {
    const message = super.toString();
    return (
      this.data
      ? `${message}. Error data: ${JSON.stringify(this.data, null, 2)}`
      : message
    );
  }
}

class NotFoundObject extends CustomError {
  constructor(objectId, objectType) {
    super(`${objectType || 'Object'} with id ${objectId} does not exist`, 400);
  }
}

const functionThatThrows = () => {
  throw new NotFoundObject('foo');
};

assert.throws(functionThatThrows, NotFoundObject);