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Pact Node

An idiomatic Node wrapper for the Pact CLI Tools.

NOTE: If you are new to Pact and are wanting to get started with contract testing, you almost certainly don't want to use this package. Head over to Pact JS instead.

Pact Node

Installation

npm install @pact-foundation/pact-node --save

Do Not Track

In order to get better statistics as to who is using Pact, we have an anonymous tracking event that triggers when Pact installs for the first time. To respect your privacy, anyone can turn it off by simply adding a 'do not track' flag within their package.json file:

{
	"name": "some-project",
	...
	"config": {
		"pact_do_not_track": true
	},
	...
}

Pact Download Location

For those that are behind a corporate firewall or are seeing issues where our package downloads binaries during installation, you can download the binaries directly from our github releases, and specify the location where you want Pact to get the binaries from using the 'config' section in your package.json file:

{
	"name": "some-project",
	...
	"config": {
		"pact_binary_location": "/home/some-user/Downloads"
	},
	...
}

It will accept both a local path or an http(s) url. It must point to the directory containing the binary needed as the binary name is appended to the end of the location. For the example given above, Pact will look for the binary at /home/some-user/Downloads/pact-1.44.0-win32.zip for a Windows system. However, by using this method, you must use the correct Pact version binary associated with this version of Pact-Node. For extra security measurements, checksum validation has been added to prevent tampering with the binaries.

If your environment uses self-signed certificates from an internal Certificate Authority (CA), you can configure this using the standard options in an npmrc file as per below:

~/.npmrc:

cafile=/etc/ssl/certs/ca-certificates.crt
strict-ssl=true

Skip Pact binary downloading

You can also force Pact to skip the installation of the binary during npm install by setting PACT_SKIP_BINARY_INSTALL=true. This feature is useful if you want to speed up builds that don't need Pact and don't want to modify your projects dependencies.

Note that pact-node will not be functional without the binary.

PACT_SKIP_BINARY_INSTALL=true npm install

Which Library/Package should I use?

TL;DR - you almost always want Pact JS.

Purpose	Library	Comments
Synchronous / HTTP APIs	Pact JS
Asynchronous APIs	Pact JS
Node.js	Pact JS
Browser testing	Pact Web	You probably still want Pact JS. See Using Pact in non-Node environments *
Isomorphic testing	Pact Web	You probably still want Pact JS. See Using Pact in non-Node environments *
Publishing to Pact Broker	Pact Node	Included in Pact JS distribution

* The "I need to run it in the browser" question comes up occasionally. The question is this - for your JS code to be able to make a call to another API, is this dependent on browser-specific code? In most cases, people use tools like React/Angular which have libraries that work on the server and client side, in which case, these tests don't need to run in a browser and could instead be executed in a Node.js environment.

Usage

Simply require the library and call the create function to start the mock service

var pact = require("@pact-foundation/pact-node");
var server = pact.createServer({ port: 9999 });
server.start().then(function() {
	// Do your testing/development here
});

Or if you're using Typescript instead of plain old Javascript

import pact from "@pact-foundation/pact-node";
const server = pact.createServer({ port: 9999 });
server.start().then(() => {
	// Do your testing/development here
});

Or you can also use the CLI

$# pact mock --port 9999

To see the list commands possible with the CLI, simply ask for help $# pact --help

Documentation

Set Log Level

var pact = require("@pact-foundation/pact-node");
pact.logLevel("debug");

Mock Servers

Mock servers are used by Pact to record interactions and create pact contracts.

Create Mock Server

var pact = require('@pact-foundation/pact-node');
var server = pact.createServer({
	...
});

Options:

Parameter	Required?	Type	Description
`port`	false	number	Port number that the server runs on, defaults to random available port
`host`	false	string	Host on which to bind the server on, defaults to 'localhost'. Supports '0.0.0.0' to bind on all IPv4 addresses on the local machine.
`log`	false	string	File to log output on relative to current working directory, defaults to none
`logLevel`	false	LogLevel (string)	Log level to pass to the pact core. One of "DEBUG", "ERROR", "WARN", "INFO"
`ssl`	false	boolean	Create a self-signed SSL cert to run the server over HTTPS , defaults to `false`
`sslcert`	false	string	Path to a custom self-signed SSL cert file, 'ssl' option must be set to true to use this option, defaults to none
`sslkey`	false	string	Path a custom key and self-signed SSL cert key file, 'ssl' option must be set to true to use this, defaults to none
`cors`	false	boolean	Allow CORS OPTION requests to be accepted, defaults to 'false'
`dir`	false	string	Directory to write the pact contracts relative to the current working directory, defaults to none
`spec`	false	number	The pact specification version to use when writing pact contracts, defaults to '1'
`consumer`	false	string	The name of the consumer to be written to the pact contracts, defaults to none
`provider`	false	string	The name of the provider to be written to the pact contracts, defaults to none
`pactFileWriteMode`	false	`overwrite` OR `update` OR `merge`	Control how the pact file is created. Defaults to "overwrite"
`format`	false	`json` OR `xml`	Format to write the results as, either in JSON or XML, defaults to JSON
`out`	false	string	Write output to a file instead of returning it in the promise, defaults to none

List Mock Servers

If you ever need to see which servers are currently created.

var pact = require("@pact-foundation/pact-node");
var servers = pact.listServers();
console.log(JSON.stringify(servers));

Remove All Mock Servers

Remove all servers once you're done with them in one fell swoop.

var pact = require("@pact-foundation/pact-node");
pact.removeAllServers();

Start a Mock Server

Start the current server.

var pact = require("@pact-foundation/pact-node");
pact.createServer()
	.start()
	.then(function() {
		// Do something after it started
	});

Stop a Mock server

Stop the current server.

var pact = require("@pact-foundation/pact-node");
pact.createServer()
	.stop()
	.then(function() {
		// Do something after it stopped
	});

Delete a Mock server

Stop the current server and deletes it from the list.

var pact = require("@pact-foundation/pact-node");
pact.createServer()
	.delete()
	.then(function() {
		// Do something after it was killed
	});

Check if a Mock server is running

var pact = require("@pact-foundation/pact-node");
pact.createServer().running;

Mock Server Events

There's 3 different events available, 'start', 'stop' and 'delete'. They can be listened to the same way as an EventEmitter.

var pact = require("@pact-foundation/pact-node");
var server = pact.createServer();
server.on("start", function() {
	console.log("started");
});
server.on("stop", function() {
	console.log("stopped");
});
server.on("delete", function() {
	console.log("deleted");
});

Provider Verification

Parameter	Required?	Type	Description
`providerBaseUrl`	true	string	Running API provider host endpoint.
`pactBrokerUrl`	false	string	Base URL of the Pact Broker from which to retrieve the pacts. Required if `pactUrls` not given.
`provider`	false	string	Name of the provider if fetching from a Broker
`consumerVersionSelectors`	false	ConsumerVersionSelector\|array	Use Selectors to is a way we specify which pacticipants and versions we want to use when configuring verifications.
`consumerVersionTags`	false	string\|array	Retrieve the latest pacts with given tag(s)
`providerVersionTags`	false	string\|array	Tag(s) to apply to the provider application
`includeWipPactsSince`	false	string	Includes pact marked as WIP since this date. String in the format %Y-%m-%d or %Y-%m-%dT%H:%M:%S.000%:z
`pactUrls`	false	array	Array of local pact file paths or HTTP-based URLs. Required if not using a Pact Broker.
`providerStatesSetupUrl`	false	string	URL to send PUT requests to setup a given provider state
`pactBrokerUsername`	false	string	Username for Pact Broker basic authentication
`pactBrokerPassword`	false	string	Password for Pact Broker basic authentication
`pactBrokerToken`	false	string	Bearer token for Pact Broker authentication
`publishVerificationResult`	false	boolean	Publish verification result to Broker (NOTE: you should only enable this during CI builds)
`customProviderHeaders`	false	array	Header(s) to add to provider state set up and pact verification
`providerVersion`	false	string	Provider version, required to publish verification result to Broker. Optional otherwise.
`enablePending`	false	boolean	Enable the pending pacts feature.
`timeout`	false	number	The duration in ms we should wait to confirm verification process was successful. Defaults to 30000.
`format`	false	string	What format the verification results are printed in. Options are `json`, `xml`, `progress` and `RspecJunitFormatter` (which is a synonym for `xml`)
`verbose`	false	boolean	Enables verbose output for underlying pact binary.
`logDir`	false	string	Directory to output the pact.log file to
`logLevel`	false	LogLevel (string)	Log level. One of "DEBUG", "ERROR", "WARN", "INFO"

Pact Broker Publishing

var pact = require('@pact-foundation/pact-node');
var opts = {
	...
};

pact.publishPacts(opts).then(function () {
	// do something
});

Options:

Parameter	Required?	Type	Description
`pactFilesOrDirs`	true	array	Array of local Pact files or directories containing them. Required.
`pactBroker`	true	string	URL of the Pact Broker to publish pacts to. Required.
`consumerVersion`	true	string	A string containing a semver-style version e.g. 1.0.0. Required.
`pactBrokerUsername`	false	string	Username for Pact Broker basic authentication. Optional
`pactBrokerPassword`	false	string	Password for Pact Broker basic authentication. Optional
`pactBrokerToken`	false	string	Bearer token for Pact Broker authentication. Optional
`tags`	false	array	An array of Strings to tag the Pacts being published. Optional
`buildUrl`	false	string	The build URL that created the pact. Optional
`branch`	false	string	The branch of the version for which you want to check the verification results. Optional
`verbose`	false	boolean	Enables verbose output for underlying pact binary.

Pact Broker Deployment Check

var pact = require('@pact-foundation/pact-node');
var opts = {
	...
};

pact.canDeploy(opts)
	.then(function (result) {
		// You can deploy this
    // If output is not specified or is json, result describes the result of the check.
    // If outout is 'table', it is the human readable string returned by the check
	})
	.catch(function(error) {
		// You can't deploy this
    // if output is not specified, or is json, error will be an object describing
    // the result of the check (if the check failed),
    // if output is 'table', then the error will be a string describing the output from the binary,

    // In both cases, `error` will be an Error object if something went wrong during the check.
	});

Options:

Parameter	Required?	Type	Description
`pacticipants`	true	[]objects	An array of version selectors in the form `{ name: String, latest?: string
			specify a tag, use the tagname with latest. Specify one of these per pacticipant
			that you want to deploy
`pactBroker`	true	string	URL of the Pact Broker to query about deployment. Required.
`pactBrokerUsername`	false	string	Username for Pact Broker basic authentication. Optional
`pactBrokerPassword`	false	string	Password for Pact Broker basic authentication. Optional
`pactBrokerToken`	false	string	Bearer token for Pact Broker authentication. Optional
`output`	false	json,table	Specify output to show, json or table. Optional, Defaults to json.
`verbose`	false	boolean	Enables verbose output for underlying pact binary.
`retryWhileUnknown`	false	number	The number of times to retry while there is an unknown verification result. Optional
`retryInterval`	false	number	The time between retries in seconds, use with retryWhileUnknown. Optional
`to`	false	string	The tag that you want to deploy to (eg, 'prod')

Stub Servers

Stub servers create runnable APIs from existing pact files.

The interface is comparable to the Mock Server API.

Create Stub Server

var pact = require('@pact-foundation/pact-node');
var server = pact.createStub({
	...
});

Options:

Parameter	Required?	Type	Description
pactUrls	true	array	List of local Pact files to create the stub service from
port	false	number	Port number that the server runs on, defaults to random available port
host	false	string	Host on which to bind the server on, defaults to 'localhost'. Supports '0.0.0.0' to bind on all IPv4 addresses on the local machine.
log	false	string	File to log output on relative to current working directory, defaults to none
logLevel	false	LogLevel (string)	Log level to pass to the pact core. One of "DEBUG", "ERROR", "WARN", "INFO"
ssl	false	boolean	Create a self-signed SSL cert to run the server over HTTPS , defaults to 'false'
sslcert	false	string	Path to a custom self-signed SSL cert file, 'ssl' option must be set to true to use this option. Defaults false
sslkey	false	string	Path a custom key and self-signed SSL cert key file, 'ssl' option must be set to true to use this option false. Defaults to none
cors	false	boolean	Allow CORS OPTION requests to be accepted, defaults to 'false'
timeout	false	number	How long to wait for the stub server to start up (in milliseconds). Defaults to 30000 (30 seconds)

Message Pacts

Create Message Pacts

var pact = require('@pact-foundation/pact-node');
var message = pact.createMessage({
	...
});

Options:

Parameter	Required?	Type	Description
`dir`	true	string	Directory to write the pact contracts relative to the current working directory, defaults to none
`consumer`	true	string	The name of the consumer to be written to the pact contracts, defaults to none
`provider`	true	string	The name of the provider to be written to the pact contracts, defaults to none
`pactFileWriteMode`	false	`"overwrite"	"update"

Example

const messageFactory = messageFactory({
	consumer: "consumer",
	provider: "provider",
	dir: dirname(`${__filename}/pacts`),
	content: `{
		"description": "a test mesage",
		"content": {
			"name": "Mary"
		}
	}`
});

messageFactory.createMessage();

CLI Tools

This package also comes with the Pact Standalone Tools available as linked binaries in the standard NPM installation directory (e..g. ./node_modules/.bin).

This means you may call them direct from scripts in your package json, for example:

"scripts": {
  "pactPublish": "pact-broker publish ./pacts --consumer-app-version=$\(git describe\) --broker-base-url=$BROKER_BASE_URL --broker-username=$BROKER_USERNAME --broker-password=BROKER_PASSWORD"`
}
These are available in circumstances where `pact-node` has not yet implemented a feature or access via JavaScript APIs is not desirable. To run the binaries is as simple as the following:

*Example can-i-deploy check*:
```sh
./node_modules/.bin/pact-broker can-i-deploy --pacticipant "Banana Service" --broker-base-url https://test.pact.dius.com.au --latest --broker-username dXfltyFMgNOFZAxr8io9wJ37iUpY42M --broker-password O5AIZWxelWbLvqMd8PkAVycBJh2Psyg1

Computer says no ¯\_(ツ)_/¯

CONSUMER       | C.VERSION | PROVIDER       | P.VERSION | SUCCESS?
---------------|-----------|----------------|-----------|---------
Banana Service | 1.0.0     | Fofana Service | 1.0.0     | false

The verification between the latest version of Banana Service (1.0.0) and version 1.0.0 of Fofana Service failed

The following are the binaries currently made available:

pact-mock-service
pact-broker
pact-stub-service
pact-message
pact-provider-verifier
pact

Windows Issues

Enable Long Paths

Windows has a default path length limit of 260 causing issues with projects that are nested deep inside several directory and with how npm handles node_modules directory structures. To fix this issue, please enable Windows Long Paths in the registry by running regedit.exe, find the key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\FileSystem\LongPathsEnabled and change the value from 0 to 1, then reboot your computer. Pact should now work as it should, if not, please raise an issue on github.

Contributing

To develop this project, simply install the dependencies with npm install --ignore-scripts, and run npm run watch to for continual development, linting and testing when a source file changes.

Testing

Running npm test will execute the tests that has the *.spec.js pattern.

Questions?

Please search for potential answers or post question on our official Pact StackOverflow.

@pact-foundation/pact-node

Pact Node

Installation

Do Not Track

Pact Download Location

Skip Pact binary downloading

Which Library/Package should I use?

Usage

Documentation

Set Log Level

Mock Servers

Create Mock Server

List Mock Servers

Remove All Mock Servers

Start a Mock Server

Stop a Mock server

Delete a Mock server

Check if a Mock server is running

Mock Server Events

Provider Verification

Pact Broker Publishing

Pact Broker Deployment Check

Stub Servers

Create Stub Server

Message Pacts

Create Message Pacts

Example

CLI Tools

Windows Issues

Enable Long Paths

Contributing

Testing

Questions?

Readme

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