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http-mockserver

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http-mockserver

Testing made easy with mocked http servers

  • 2.7.14
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  • npm
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Install

$ npm install --save http-mockserver

Usage

const { mockServer } = require('http-mockserver');

// Static mock
mockServer.addMock({
	port: 8080,
	method: 'GET',
	uri: '/my/url',
	response: {
		body: 'Hello world'
	}
});

// Dynamic mock
let counter = 0;
mockServer.addMock({
	port: 8080,
	method: 'GET',
	uri: '/my/other/url',
	handler: function (req, res) {
		counter++;
		res.send(`Counter: ${counter}`);
	}
});

Mock object

To mock an endpoint, the mock object should follow one of these structures:

Static mock
  • port: port of request, eg. 4000
  • uri: uri of request, eg. /users/peter
  • method: method of request, eg. GET
  • response: Response object
    • body, eg. {data: "hello"}
    • statusCode, eg. 404 (default: 200)
    • headers, eg. {"Content-Type": "application/json"}
Dynamic mock
  • port: port of request, eg. 4000
  • uri: uri of request, eg. /users/peter
  • method: method of request, eg. GET
  • handler: function(req, res) {...}

API

The following methods are available on both mockServer and mockClient

addMock(mock)

Mock and endpoint of a port and route, with a specific response (static mock) or a handler function (dynamic mock).

Arguments:

  • mock: Mock object. See mock object for details
clearAll()

Remove all mocks and clear the request log

create(port)

Returns a mockserver instance with the same API interface, but the methods do not require a port to be specified.

Arguments:

  • port: Port number.

Example:

const { mockServer } = require('http-mockserver');
const backendService = mockServer.create(8888);

backendService.addMock({
	uri: '/some/url/to/mock',
	method: 'GET',
	response: {
		body: 'Hello world!'
	}
});

$ curl localhost:8888/some/url/to/mock 
"Hello world!"
getRequests([port])

Returns request log. If port is specified, request will be filtered by this

Arguments:

  • port: Port number.
waitForRequest(port, predicate, [count = 1, delay = 500])

Returns a list of request logs that the predicate returns truthy for. The predicate is invoked with three arguments: (requestLog, index, requestLogs).

Arguments:

  • port: Port number.
  • predicate: The function invoked per iteration.
  • count: Exact number of request logs to match before returning
  • delay: Time between requests

MockServer API

The following methods are available only available on mockServer

mockServer.start(port)

Start mockserver on the specified port.

Arguments:

  • port: Port of MockServer (default: 3000)
mockServer.stop()

Stop mockserver

MockClient API

The following methods are available only available on mockClient. You only need to use the client if you are communicating with a mockServer that was started from commandline or by a separate Node process with mockServer.start().

mockClient.setServerHost(serverHost)

Set hostname and port of mockserver. This is necessary if you start MockServer on another port than the default (port 3000).

Arguments:

  • serverHost: Host of mockserver (Default: localhost:3000)

MockServer CLI Options

If you need to interact with the mockserver from other languages that Node.js, you can start it as a stand-alone process, and add mocks by interacting with the REST api. To start mockServer from the command-line run http-mockserver. You can also use the CLI tool to start a mockserver with some preconfigured mocks, and load them on startup with http-mockserver --mocks ./mock-folder

$ http-mockserver --help

  Usage: http-mockserver [options]

  Options
    --port     MockServer port, default: 3000
    --mocks    Path to mock config files

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Package last updated on 31 Oct 2024

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