https://github.com/ibrohimrasulov/unit-testing-practices

https://github.com/ibrohimrasulov/unit-testing-practices

Last synced: 13 days ago
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• Host: GitHub
• URL: https://github.com/ibrohimrasulov/unit-testing-practices
• Owner: IbrohimRasulov
• Created: 2021-11-05T11:55:26.000Z (about 3 years ago)
• Default Branch: main
• Last Pushed: 2022-01-19T18:55:49.000Z (almost 3 years ago)
• Last Synced: 2023-03-06T17:04:07.967Z (almost 2 years ago)
• Language: JavaScript
• Size: 117 KB
• Stars: 7
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Unit-Testing-Practices

## Exercise

In this exercise, you will write a few practical tests for JavaScript functions using the [Jest](https://jestjs.io/) library.

## Author

👤 **Ibrohim Rasulov**

- GitHub: [@IbrohimRasulov](https://github.com/IbrohimRasulov)

- Twitter: [@IbrohimRasu1ov](https://twitter.com/IbrohimRasu1ov)

- LinkedIn: [LinkedIn](https://www.linkedin.com/in/ibrohim-rasulov-a88352209/)

### Instructions 

#### Task 1

- Write a function *stringLength(string)* that takes any string as an argument and returns its characters count.

- Now write a test for this function.

- Next, expand your function to make it check if the string is at least 1 character long and not longer than 10 characters. Throw errors if those conditions are not met.

- Add tests for the new functionality.

#### Task 2

- Write a function *reverseString(string)* function. It should take a string as an argument and return it reversed.

- Write at least one test for this function.

#### Task 3

In this task, you will need to write several tests for each tested function. You could write all of your tests directly at the top level, but it's better to group related tests so their output is more readable. *Jest* has the `describe()` method just for that. Read about it [here](https://jestjs.io/docs/api#describename-fn) and apply it in your tests for this task:

- Write a simple *calculator* class or object, which will have 4 methods: *add*, *subtract*, *divide*, and *multiply*.

- Write at least 3 tests for each of the calculator methods.

- Group tests for each method using `describe()` method.

#### Task 4 

In this task we're going to do things differently:

- Start by writing a test for a *capitalize(string)* function. Your test should make sure that this function takes a string as an argument and returns that string with the first character capitalized.

- Run your test - it should fail because you don’t have the *capitalize(string)* function implemented yet.

- Now make your tests green by implementing the *capitalize(string)* function. Think about what the minimum amount of code is necessary to pass this test and write it.

## Show your support

Give a ⭐️ if you like this project!

## Acknowledgments

- Hat tip to anyone whose code was used

- Inspiration

- etc