Testing Chain of Responsibility Design pattern

chain-of-responsibility.js

class ProcessValidations {
    /**
     * Create concrete element
     * @param {Array} validators
     */
    constructor(transaction) {
        this.validators = []
        this.transaction = transaction
    }

    setValidators(...validators) {
        this.validators = validators
        return this;
    }

    process() {
        let handlers = [...this.validators]
        const code = 'code'

        handlers = handlers.map((handler, index) => () => {
            handler(this.transaction, code, handlers[index + 1])
        })

        handlers[0]()
    }
}

const validation1 = (p1, p2, next) => {
    console.log('validation1')
    console.log(p1)
    console.log(p2)
    next(p1, p2)
}

const validation2 = (p1, p2, next) => {
    console.log('validation2')
    console.log(p1)
    console.log(p2)
    next()
}

const validation3 = (p1, p2, next) => {
    console.log('validation3')
}



const ProcessValidations =
    new ProcessValidations('transactionValue')
    .setValidators(validation1, validation2, validation3)
    .process()