index.ts

import assert from 'assert';

class BankCustomer {
    private name: string;
    private secretCode: string;
    public isCodeOk: boolean = false;

    constructor(name: string, code: string) {
        this.name = name;
        this.secretCode = code;
    }
    getName() {
       return this.name;
    }

    verifyPinInput(codeEntre: string)  {
        if(this.secretCode === codeEntre) {
            this.isCodeOk = true;
        }
        return this.isCodeOk;

    }
}
const customer = new BankCustomer('John Doe', '3579');
assert.equal(typeof customer.getName, 'function');
assert.equal(typeof customer.verifyPinInput, 'function');
assert.equal(customer.getName(), 'John Doe');
assert.ok(customer.verifyPinInput('3579'));
console.log(customer);

export default assert;