freeCodeCamp/docs/how-to-add-cypress-tests.md

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# How to add Cypress tests
When making changes to JavaScript, CSS, or HTML which could change the functionality or layout of a page, it's important to add corresponding [Cypress](https://docs.cypress.io) integration tests.
To learn how to write Cypress tests, or 'specs', please see Cypress' official [documentation](https://docs.cypress.io/guides/getting-started/writing-your-first-test.html).
## Where to add a test
- Cypress tests are in the `./cypress` directory.
- Cypress tests for a curriculum module are in the corresponding curriculum directory, i.e. `cypress/integration/learn/responsive-web-design/basic-css/index.js`.
## How to run tests
> [!NOTE]
> If using GitPod, please see [Cypress-GitPod Setup](how-to-add-cypress-tests.md#cypress-gitpod-setup)
### 1. Ensure that MongoDB and client applications are running
- [Start MongoDB and seed the database](how-to-setup-freecodecamp-locally.md#step-3-start-mongodb-and-seed-the-database)
- [Start the freeCodeCamp client application and API server](how-to-setup-freecodecamp-locally.md#step-4-start-the-freecodecamp-client-application-and-api-server)
### 2. Run the cypress tests
To run tests against production builds, replace `dev` with `prd` below.
- To run all tests in the `./cypress` directory:
```console
npm run cypress:dev:run
```
- To run a single test:
```console
npm run cypress:dev:run -- --spec=cypress/pathToYourSpec/youSpecFileName.js
```
- To create a development build, start the development server, and run all existing cypress end-to-end tests:
```console
npm run e2e:dev:run
```
## Cypress-GitPod Setup
### 1. Ensure Development Environment is Running
If starting the GitPod environment did not automatically develop the environment:
- Start the database
```console
mongod
```
- Seed the database
```console
npm run seed
```
- Develop the server and client
```console
npm run develop
```
### 2. Install Cypress Build Tools
```console
npm run cypress:install-build-tools
```
- When prompted in the terminal, select your keyboard layout by language/area
Now, [Cypress can be run](how-to-add-cypress-tests.md#_2-run-the-cypress-tests)