https://github.com/carreraprogrammer/solutions-clojure

https://github.com/carreraprogrammer/solutions-clojure

clojure deftest spec

Last synced: about 1 month ago
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• Host: GitHub
• URL: https://github.com/carreraprogrammer/solutions-clojure
• Owner: carreraprogrammer
• Created: 2023-02-03T21:28:39.000Z (almost 2 years ago)
• Default Branch: dev
• Last Pushed: 2023-02-11T16:11:44.000Z (almost 2 years ago)
• Last Synced: 2024-05-17T15:36:49.612Z (8 months ago)
• Topics: clojure, deftest, spec
• Language: C++
• Homepage:
• Size: 41 KB
• Stars: 3
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Engineering Challenge

## Getting started

This clojure challenge is made up of 3 questions that reflect the learning you accumulated for the past week. Complete the following instructions:

1. Create a Gitlab repo of your own and fork this repo. When complete, send us the link to your challenge results.

2. Duration: About 4 hours

3. Install Cursive Plugin to Intellij and setup a clojure deps project. https://cursive-ide.com/userguide/deps.html  

1. Enjoy!

## Problems

### Problem 1 Thread-last Operator ->>

Given the invoice defined in **invoice.edn** in this repo, use the thread-last ->> operator to find all invoice items that satisfy the given conditions. Please write a function that receives an invoice as an argument and returns all items that satisfy the conditions described below.

#### Requirements

- Load invoice to play around with the function like this:

```

(def invoice (clojure.edn/read-string (slurp "invoice.edn")))

```

#### Definitions

- An invoice item is a clojure map { … } which has an :invoice-item/id field. EG.

```

{:invoice-item/id     "ii2"  

  :invoice-item/sku "SKU 2"}

```

- An invoice has two fields :invoice/id (its identifier) and :invoice/items a vector of invoice items

#### Invoice Item Conditions

- At least have one item that has :iva 19%

- At least one item has retention :ret\_fuente 1%

- Every item must satisfy EXACTLY one of the above two conditions. This means that an item cannot have BOTH :iva 19% and retention :ret\_fuente 1%.

## Problem 2: Core Generating Functions

  Given the invoice defined in **invoice.json** found in this repo, generate an invoice that passes the spec **::invoice** defined in **invoice-spec.clj**. Write a function that as an argument receives a file name (a JSON file name in this case) and returns a clojure map such that

```

(s/valid? ::invoice invoice) => true 

```

where invoice represents an invoice constructed from the JSON.

## Problem 3: Test Driven Development

Given the function **subtotal** defined in **invoice-item.clj** in this repo, write at least five tests using clojure core **deftest** that demonstrates its correctness. This subtotal function calculates the subtotal of an invoice-item taking a discount-rate into account. Make sure the tests cover as many edge cases as you can!