https://github.com/hurricanemark/cashregister
Demonstrate JavaScript test suite using jest.js testing framework.
https://github.com/hurricanemark/cashregister
javascript jest node-fetch nodejs testing-tools
Last synced: 2 months ago
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Demonstrate JavaScript test suite using jest.js testing framework.
- Host: GitHub
- URL: https://github.com/hurricanemark/cashregister
- Owner: hurricanemark
- Created: 2023-10-24T22:02:04.000Z (over 2 years ago)
- Default Branch: master
- Last Pushed: 2023-10-25T15:21:55.000Z (over 2 years ago)
- Last Synced: 2025-03-22T04:13:00.205Z (about 1 year ago)
- Topics: javascript, jest, node-fetch, nodejs, testing-tools
- Language: JavaScript
- Homepage:
- Size: 161 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
# NodeJS with the `jest` Testing Module
***"Jest is a delightful JavaScript Testing Framework with a focus on simplicity."*** [https://jestjs.io]
Let's build the logic of a cash register and test it against the jestjs module!
## Cash Register
Given a price and a list of cash denominations, return the number of ways to make change.
**Input**: price, cash, cash in drawer
**Output**: { status: message, change: [[denomination, number of denominations]] }
### Pseudo code
1. Create a function called makeChange that takes in a price, cash, and a list of cash denominations.
2. Calculate initial values:
- The total amount of cash in the drawer.
- The required change amount; (price - cash).
+ From the required change amount, extract the whole and the decimal values.
3. Create a hashmap to store the denominations and their values from the cid (cash in drawer).
4. Check base cases:
- If the total amount of cash in the drawer is less than the required change amount, return {status: "INSUFFICIENT_FUNDS", change: []}
- If the total amount of cash in the drawer is equal to the required change amount, return {status: "CLOSED", change: cid}
5. Loop through the hashmap and check each denomination if it is greater than or equal to the required change amount.
6. If the denomination is greater than or equal to the required change amount, then add it to the change array.
Then subtract the denomination from the required change amount.
7. If the denomination contains less than the required change amount, then continue to the next denomination.
8. If the required change amount is 0, then we have reached the end.
### Coding
```
git init cashRegister
cd cashRegister
touch README.md
touch index.js
mkdir __tests__
touch __tests__/tests.js
npm install node-fetch
npm install jest
```
### Testing with jest
[jest test framework](https://jestjs.io/)
```
npm install
npm run test
```
**Output:**
```
> cashregister@1.0.0 test
> jest ./__tests__/tests.js --verbose
console.log
==== Spot Tests: =====
at log (index.js:171:13)
console.log
Test #1
at log (index.js:175:13)
console.log
{
status: 'CLOSED',
change: [
[ 'PENNY', 0.5 ],
[ 'NICKEL', 0 ],
[ 'DIME', 0 ],
[ 'QUARTER', 0 ],
[ 'ONE', 0 ],
[ 'FIVE', 0 ],
[ 'TEN', 0 ],
[ 'TWENTY', 0 ],
[ 'ONE HUNDRED', 0 ]
]
}
at log (index.js:176:13)
console.log
Test #2
at log (index.js:180:13)
console.log
{ status: 'INSUFFICIENT_FUNDS', change: [] }
at log (index.js:181:13)
console.log
Test #3
at log (index.js:186:13)
console.log
{ status: 'OPEN', change: [ [ 'QUARTER', 0.5 ] ] }
at log (index.js:187:13)
console.log
==== Grainula Tests: =====
at log (index.js:193:13)
console.log
Test# 1:
at log (index.js:207:13)
console.log
{
status: 'OPEN',
change: [
[ 'TWENTY', 60 ],
[ 'TEN', 20 ],
[ 'QUARTER', 0.25 ],
[ 'DIME', 0.2 ],
[ 'PENNY', 0.01 ]
]
}
at log (index.js:208:13)
console.log
Test# 2:
at log (index.js:210:13)
console.log
{ status: 'OPEN', change: [] }
at log (index.js:211:13)
console.log
Test# 3:
at log (index.js:213:13)
console.log
{ status: 'OPEN', change: [ [ 'QUARTER', 0.5 ] ] }
at log (index.js:214:13)
console.log
Test# 4:
at log (index.js:216:13)
console.log
{ status: 'OPEN', change: [] }
at log (index.js:217:13)
console.log
Test# 5:
at log (index.js:219:13)
console.log
{
status: 'OPEN',
change: [ [ 'FIVE', 10 ], [ 'QUARTER', 0.75 ], [ 'PENNY', 0.03 ] ]
}
at log (index.js:220:13)
console.log
Test# 6:
at log (index.js:222:13)
console.log
{ status: 'OPEN', change: [ [ 'PENNY', 0.01 ] ] }
at log (index.js:223:13)
PASS __tests__/tests.js
autoTests
√ Test# 1
Price: 119.542345
Paying with: 200 (2 ms)
√
Test# 2
Price: 3.26
Paying with: 0.5012
√
Test# 3
Price: 19.5
Paying with: 20
√
Test# 4
Price: 1029.34
Paying with: 1029 (1 ms)
√
Test# 5
Price: 59.22
Paying with: 70 (1 ms)
√
Test# 6
Price: 0.99
Paying with: 1 (1 ms)
Test Suites: 1 passed, 1 total
Tests: 6 passed, 6 total
Snapshots: 0 total
Time: 2.02 s
Ran all test suites matching /.\\__tests__\\tests.js/i.
```
### Conclusion
I am pleasantly surprised with the ease of integrating the jest package. We barely touched on all but a few of jest methods. [Read more about jest here](https://jestjs.io/docs/api). The verbose output is very nice.
*If you appreciate this article and found you learned something new, considered buying me a coffee, then head over to here*
*or to the [Coffee shop](https://www.buymeacoffee.com/hurricanemark)*