docs: add cypress-gitpod guide (#40925)

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

@@ -6,38 +6,79 @@ To learn how to write Cypress tests, or 'specs', please see Cypress' official [d
 
 > Note: When writing tests for freeCodeCamp, remember to add `/* global cy */` to the top of the file to avoid ESLint issues.
 
-### Where to add a test
+## 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
+## How to run tests
 
-**1. Ensure that MongoDB and client applications are running**
+> [!NOTE]
+> If using GitPod, please see [Cypress-GitPod Setup](/how-to-add-cypress-tests#cypress-gitpod-setup)
 
-  - [Start MongoDB and seed the database](/how-to-setup-freecodecamp-locally#step-3-start-mongodb-and-seed-the-database)
+### 1. Ensure that MongoDB and client applications are running
 
-  - [Start the freeCodeCamp client application and API server](/how-to-setup-freecodecamp-locally#step-4-start-the-freecodecamp-client-application-and-api-server)
+- [Start MongoDB and seed the database](/how-to-setup-freecodecamp-locally#step-3-start-mongodb-and-seed-the-database)
 
-**2. Run the cypress tests**
+- [Start the freeCodeCamp client application and API server](/how-to-setup-freecodecamp-locally#step-4-start-the-freecodecamp-client-application-and-api-server)
 
-  To run tests against production builds, replace `dev` with `prd` below.
+### 2. Run the cypress tests
 
-  - To run all tests in the `./cypress` directory:
+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:
+- 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:
+- 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 you are on the _Feature Preview_ of GitPod _as of 01/02/2021_
+
+- Go to [GitPod Docs - Feature Preview](https://www.gitpod.io/docs/feature-preview/) to see how to enable _Feature Preview_
+
+### 2. 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
+```
+
+### 3. 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#_2-run-the-cypress-tests)