API mocking with OpenAPI

API mocking with OpenAPI

API mocking with OpenAPI. An API mock is a piece of code that allows a developer, with the help of a mock server, to have working API endpoints without writing the code behind it.

An API mock is a piece of code that allows a developer, with the help of a mock server, to have working API endpoints without writing the code behind it.

Designed by vectorjuice / Freepik

API mocking has many useful applications:

  • speeds up backend and frontend development since the two teams can agree on a contract and work in parallel to one another
  • enables testing software that uses services or tools hosted in real deployments, such as billed services
  • improves test quality by introducing some “chaos”, such as increased response time or response errors like general system unavailability

Formalizing the API contract in an OpenAPI document is a well-known practice that allows the setup of a unique source of truth: with the help of some tools it also creates API mocks very easily.

What we are going to do

We are going to build a possible workflow on how to test services accessing external APIs, and in doing so we will:

  • declare three mocked endpoints, using the MockServer tool
  • write a BDD test simulating the call to a mocked endpoint, using the Go programming language and the GoConvey library
  • deploy a GitLab testing pipeline that runs the test using the mocked API in a dockerized environment

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