portatlas / nextjs-graphql

This is a simple application that calls a graphql endpoint for a country data And has a simple form to encrypt the returned data with a Caesar Cipher

Getting Started

Clone down the project and install the dependencies:

npm install

Run the development server:

npm run dev
# or
yarn dev

Open http://localhost:3000 with your browser to see the result.

Unit Testings

Tips & Recommended Practice

1. Your unit tests are the documentation for your code
2. Structure of A Unit Test
   • Given, When, Then
   • Arrange, Act, Assert
   • They should be independent and testing should be targeted to smallest unit of your code
3. If something is hard to test then that could be a code smell
   • Can the code be refactored to adhere to the Single Responsibility Principle?
   • Are the abstractions correct?
4. One assertion per unit test
5. Set Up a Clean Environment For Each Test (beforeEach, afterEach, beforeAll, afterAll)
6. Use Mocks to test effectively

Unit Testing Classses and Functions

Testings pure functions can be a great way to get started unit testing and get familiar with the testing framework you are using. For this example, we will test a function that implements the Caesar Cipher

React Unit Testing with GraphQL Dependencies

react-testing-library makes it easier to test how the user will interact with our app. As we dive deeper we will take a look at how we can mock external graphql calls and test how our app is being used based on those dependencies