How to load testing an application that calling external service APIs using Jmeter?

Question

I currently want to perform a load testing an application using Jmeter but some functions need to call an external service APIs.

So I want to know how do I test those APIs without the app calling the actual external API service.

For example, I want to test an application that calling Google Maps Platform Directions API to get a direction from point A to B.

Answer 1

There is a concept of Mock Object , you can configure your application to point to your own external API implementation instead of Directions API which will return static or random or pre-defined response.

One of possible options is using ie Wiremock for this, you can interact with Wiremock REST API using JMeter's HTTP Request samplers to create/amend mock responses on the fly.