Sky (Middle-back) end Unattended Test

Scenario

A ground-breaking broadcaster has decided to reward its most loyal customers. A software engineering team, developing the customer account website, is working on the story below.

User Story

Display customer's available rewards

As a customer, if I am eligible for rewards, then I want to see which rewards are available based on my channel subscriptions.

The Account Management team has partnered with the Customer Status team that provides a service that checks the customer eligibility based on loyalty and billing status.

Instructions

You are required to provide an implementation of a RewardsService in javascript as a single function, e.g.:

function rewardsService({ customerAccountNumber, portfolio, eligibilityService }) {
    // ...amazing code

    return {
        data: [],
    }
}

Please structure your app as follows

app
- redeemService.js
- constants.js (for simplicity you may also put any stubs or object mappings in here)
- redeemService-test.js
- package.json
- .node-version

The service accepts as input; a customer account number, a portfolio containing channels subscriptions and the eligibilityService as a function to be called. If the customer is eligible for rewards the RewardsService should return a list of all the rewards available according to the subscriptions on the portfolio.

The code should be evaluated via tests (e.g npm run tests). Please do not build a runnable server (i.e a Koa or Express app)

Additional Information

The following table describes the codes for the channel subscriptions and the associated rewards.

Channel	Reward
SPORTS	CHAMPIONS_LEAGUE_FINAL_TICKET
KIDS	N/A
MUSIC	KARAOKE_PRO_MICROPHONE
NEWS	N/A
MOVIES	PIRATES_OF_THE_CARIBBEAN_COLLECTION

The Customer Status team is currently developing the EligibilityService which accepts the account number as an input. You are required to provide a mock or stub of the EligibilityService interface such that in your tests you can stub the different responses given back from this service.

EligibilityService output	RewardsService result
CUSTOMER_ELIGIBLE	Return relevant rewards according to the customer's portfolio
CUSTOMER_INELIGIBLE	Return no rewards
Technical failure exception	Return no rewards
Invalid account number exception	Return no rewards and notify the client that the account number is invalid

What we look at