![]() Summary: This API returns a list of cat facts Preview snippet of the code in this file ( this is just part of the code, the entire code for copy-paste can be downloaded above): openapi: 3.0.0ĭescription: CatFacts API returns cat facts Open the file (with Notepad++ for example). You can manually change it to *.yaml if you want to use it on Confluence with the SwaggerUI macro. Now, why don’t we head to Swagger.io and paste the code below in the right hand panel:ĭownload the example code CatfactsExample.YAML right here - Note that with other JSON files I wanted to upload here, the file format is currently *.txt. And in my experience, anyone who has an example file to play with (which I will provide further on in this blog) can edit, extend (and copy-paste), to create a contract that suits their own endpoint(s).įor the examples we are using the free-to-use Catfacts API. Swagger provides a great overview and interface to work with. We create OpenAPI3.0 documentation with Swagger because our backend (and endpoints) are JSON based. My team and me quickly turn to Swagger.io, an online editor that has the contract code on the left hand side of the screen and a visual interpretation (and possible errors if the tool finds any) on the right hand side. Where do we start when writing up a contract? And if anything differs, we have the contract as a solid agreement and either of the parties will have to make changes to abide by the contract once again. We know what will be requested, we know what will be returned. Once the contract is agreed, this contract can be used as a basis for all parties involved. ![]() Once all is decided, this concept contract is discussed and assessed by both parties (or more, if more parties are involved). What responses can we expect? What attributes can we expect? In what format will they be? Will they be arrays or objects? Before either party starts developing, analysts and developers (or a selection of them) start drawing what the API should look like. ![]() Contract based testing starts with, duh, a contract. So, what can be done? A possible solution to these challenges would be contract based testing. ![]() Table of Contents Contracts Where do we start when writing up a contract? Creating a JSON Schema Adding Schema validation to Postman tests Create a new GET Request Create JSON Schema(s) in Pre-request Script Use the JSON Schema(s) to validate the contract in your tests Watch it pass! Make it fail! Watch it fail! Recap Contracts This blog explains how to use Swagger contracts and Postman schema validation. If it concerns a pressing issue or an important business feature, we want to release these to our customers as soon as possible. This way, testing can be done, expectations can be met and bugs can be fixed. In order to fight this, the providing party usually plans to finish their work before the consuming party starts developing. Looking at API’s, it can happen that the providing party returns a decimal, where the consuming party expects an integer, leading to differences in the available data or, in the worst case, (uncaught) errors. As a developer or tester, we often find inconsistencies between what one party develops, and what the other party expects. ![]()
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