Testing Express

This example shows how to implement integration tests using Express, Supertest and Prisma Client. It uses a Prisma Postgres database.

Getting started

1. Download example and navigate into the project directory

Download this example:

npx try-prisma@latest --template orm/testing-express --install npm --name testing-express

Then, navigate into the project directory:

cd testing-express

Alternative: Clone the entire repo

Clone this repository:

git clone git@github.com:prisma/prisma-examples.git --depth=1

Install npm dependencies:

cd prisma-examples/orm/testing-express
npm install

2. Create and seed the database

Create a new Prisma Postgres database by executing:

npx prisma init --db

If you don't have a Prisma Data Platform account yet, or if you are not logged in, the command will prompt you to log in using one of the available authentication providers. A browser window will open so you can log in or create an account. Return to the CLI after you have completed this step.

Once logged in (or if you were already logged in), the CLI will prompt you to:

Select a region (e.g. us-east-1)
Enter a project name

After successful creation, you will see output similar to the following:

CLI output

Let's set up your Prisma Postgres database!
? Select your region: ap-northeast-1 - Asia Pacific (Tokyo)
? Enter a project name: testing-migration
✔ Success! Your Prisma Postgres database is ready ✅

We found an existing schema.prisma file in your current project directory.

--- Database URL ---

Connect Prisma ORM to your Prisma Postgres database with this URL:

prisma+postgres://accelerate.prisma-data.net/?api_key=...

--- Next steps ---

Go to https://pris.ly/ppg-init for detailed instructions.

1. Install and use the Prisma Accelerate extension
Prisma Postgres requires the Prisma Accelerate extension for querying. If you haven't already installed it, install it in your project:
npm install @prisma/extension-accelerate

...and add it to your Prisma Client instance:
import { withAccelerate } from "@prisma/extension-accelerate"

const prisma = new PrismaClient().$extends(withAccelerate())

2. Apply migrations
Run the following command to create and apply a migration:
npx prisma migrate dev

3. Manage your data
View and edit your data locally by running this command:
npx prisma studio

...or online in Console:
https://console.prisma.io/{workspaceId}/{projectId}/studio

4. Send queries from your app
If you already have an existing app with Prisma ORM, you can now run it and it will send queries against your newly created Prisma Postgres instance.

5. Learn more
For more info, visit the Prisma Postgres docs: https://pris.ly/ppg-docs

Locate and copy the database URL provided in the CLI output. Then, create a .env file in the project root:

touch .env

Now, paste the URL into it as a value for the DATABASE_URL environment variable. For example:

# .env
DATABASE_URL=prisma+postgres://accelerate.prisma-data.net/?api_key=ey...

Run the following command to create tables in your database. This creates the User and Post tables that are defined in prisma/schema.prisma:

npx prisma migrate dev --name init

Execute the seed file in prisma/seed.ts to populate your database with some sample data, by running:

npx prisma db seed

3. Start the REST API server

Rename the .env.example to .env and execute this command to start the server:

npm run dev

The server is now running on http://localhost:3000. You can send the API requests implemented in index.js, e.g. http://localhost:3000/feed.

4. Testing the endpoints

The tests are located in the tests folder. In these you will find tests handled for cases if a same user is added twice and also to check if the users added are obtained correctly.

The tests can be run using:

npm test

Using the REST API

You can access the REST API of the server using the following endpoints:

`GET`

/user: Fetch all users

`POST`

/user: Create a new user
- Body:
  - email: String (required): The email address of the user
  - name: String (optional): The name of the user

Switch to another database (e.g. SQLite, MySQL, SQL Server, MongoDB)

If you want to try this example with another database than Postgres, you can adjust the the database connection in prisma/schema.prisma by reconfiguring the datasource block.

Learn more about the different connection configurations in the docs.

Expand for an overview of example configurations with different databases

Remove the Prisma Client extension

Before you proceed to use your own database, you should remove the Prisma client extension required for Prisma Postgres:

npm uninstall @prisma/extension-accelerate

Remove the client extension from your PrismaClient instance:

- const prisma = new PrismaClient().$extends(withAccelerate())
+ const prisma = new PrismaClient()

Your own PostgreSQL database

To use your own PostgreSQL database remove the @prisma/extension-accelerate package and remove the Prisma client extension.

SQLite

Modify the provider value in the datasource block in the prisma.schema file:

datasource db {
  provider = "sqlite"
  url      = env("DATABASE_URL")
}

Create an .env file and add the SQLite database connection string in it. For example:

DATABASE_URL="file:./dev.db""

MySQL

Modify the provider value in the datasource block in the prisma.schema file:

datasource db {
  provider = "mysql"
  url      = env("DATABASE_URL")
}

Create an .env file and add a MySQL database connection string in it. For example:

## This is a placeholder url
DATABASE_URL="mysql://janedoe:mypassword@localhost:3306/notesapi"

Microsoft SQL Server

Modify the provider value in the datasource block in the prisma.schema file:

datasource db {
  provider = "sqlserver"
  url      = env("DATABASE_URL")
}

Create an .env file and add a Microsoft SQL Server database connection string in it. For example:

## This is a placeholder url
DATABASE_URL="sqlserver://localhost:1433;initial catalog=sample;user=sa;password=mypassword;"

MongoDB

Modify the provider value in the datasource block in the prisma.schema file:

datasource db {
  provider = "mongodb"
  url      = env("DATABASE_URL")
}

Create an .env file and add a local MongoDB database connection string in it. For example:

## This is a placeholder url
DATABASE_URL="mongodb://USERNAME:PASSWORD@HOST/DATABASE?authSource=admin&retryWrites=true&w=majority"

Next steps

Check out the Prisma docs
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