From: https://docs.pact.io/

Pact is a code-first tool for testing HTTP and message integrations using contract tests. Contract tests assert that inter-application messages conform to a shared understanding that is documented in a contract. Without contract testing, the only way to ensure that applications will work correctly together is by using expensive and brittle integration tests.

cd pact-provider
npm i
cd ../pact-ts-consumer
npm i

Running:

npm test

generates the pact file inside the pacts folder.

Run the provider:

node index.js

Run the test verification:

npm test

Install CLI:

curl -fsSL https://raw.githubusercontent.com/pact-foundation/pact-ruby-standalone/master/install.sh | PACT_CLI_VERSION=v2.0.3 bash

Publish pacts

pact-broker publish -b "http://localhost:9292" pacts --consumer-app-version=0.0.1