Node Mock Server

A testing library that lets you spin up a real Express-based server during tests, to stub out and check the requests made to the systems your application interacts with.

Usage

An example of a minimal server setup:

import mockserver from "@kaluza/mock-server";

// Create a server on port 8000
const server = mockserver(8000);

// Define some stubbed endpoints
const endpoint = server.get("/path", { status: "OK" });

// Start the server
await server.start();

// Run some code that makes a request to /path
await fetch("http://localhost:8000/path");

// Check the request
console.log(endpoint.calls.length === 1);

// Stop the server
await server.stop();

Reference

mockserver()

mockserver(port, [options])

Creates a new MockServer object with options. Only one path is registered: /mockserver.

Options object:

• enableLogging - logs out events such as endpoint registration, requests made. Defaults to false
• useHttps - creates a https server.
• sslCertDir - the directory the https server looks in for the self-signed certificate files server.key and server.cert.
• middleware - an array of Express middleware that will be applied to all routes in the server.

MockServer

server.get(path, response, [responseStatus])

Registers a GET endpoint for the given path, returning an EndpointRecord.

• path is an Express-compatible path
• response can be either an object, which will be returned as JSON, or an Express-compatible request handler. This lets you vary the response based on what's in the request. This can also be a number, which will be used as a response status code if the request should not have any content.
• responseStatus can optionally be provided to specify a response status code, this defaults to 200 if not set.

If two endpoints are created on the same path, the most recently created one will take precedence.

server.post(path, response, [responseStatus])

Registers a POST endpoint for the given path, returning an EndpointRecord.

• path is an Express-compatible path
• response can be either an object, which will be returned as JSON, or an Express-compatible request handler. This lets you vary the response based on what's in the request. This can also be a number, which will be used as a response status code if the request should not have any content.
• responseStatus can optionally be provided to specify a response status code, this defaults to 200 if not set.

If two endpoints are created on the same path, the most recently created one will take precedence.

server.patch(path, response, [responseStatus])

Registers a PATCH endpoint for the given path, returning an EndpointRecord.

• path is an Express-compatible path
• response can be either an object, which will be returned as JSON, or an Express-compatible request handler. This lets you vary the response based on what's in the request. This can also be a number, which will be used as a response status code if the request should not have any content.
• responseStatus can optionally be provided to specify a response status code, this defaults to 200 if not set.

If two endpoints are created on the same path, the most recently created one will take precedence.

server.reset()

Resets the server, creating a new express instance with no endpoints registered except the default /mockserver. Can be used to clean up if re-using a server between test suites.

server.stop([options])

Stops the server, preventing it from receiving any new connections.

Options object:

• force - whether to force stop the server, closing any connections that are still open. Defaults to false.

EndpointRecord

Returned when an endpoint is registered. It lets you make assertions against calls to the server.

record.calls

An array of CallRecords. These are objects with the following properties:

• params - the path params in the request
• query - the query params in the request
• headers - the request headers
• body - the request body, for calls that have one