📜 Contract Testing example in .NET 5 and C# 8

Contract testing example with two API consumers and one API provider using PactNET. Use this repo as a guide to kick off a conversation about how to write and honor contracts between an API and consumers of that API.

Run ship-it.sh to create and verify contracts between parties. Take a look for more info on parties below in the Scenario section.

✳️ Scenario

There is an Address Book API that serves all things related to a person's basic information. This API is popular and now has demand from many vendors that would want to connect to it and use it seamlessly. Our goal is to make sure that all the consumers of the API are using it without issue, and we, as maintainers of the API can modify it, upgrade it, maintain it flawlessly. If we can create a contract between all (or some) of the vendors using this API, we can get feedback immediately if the changes we make to the API break some consumers (or even all of them).

🏆 Goal: Satisfy the demands of all the API consumers, or get feedback immediately if the contract between a consumer and an API is broken.

Navigating the code of this example

• Provider (i.e. API): AddressBook.API
• Provider Verification (i.e. API contract verification tests): AddressBook.API.Tests
• Consumer 1 (i.e. user of the API): AddressBook.API.Consumer1.Pact
• Consumer 2 (i.e. another user of the API): AddressBook.API.Consumer2.Pact

🤔 Gotchas

• Launching a Test server but no endpoints are loaded When launching a test server in your test cases with PactNet, we use Kestrel as a standalone Http server that hosts your provider, but we register a TestStartup class instead of Startup in AddressBook.API. The Kestrel test server does not automatically register the controllers in the main project so it is very important to make sure that controllers are explicitly registered in Startup.cs. Refer to ConfigureServices method in Startup.cs and point your attention to AddApplicationPart(..) method that makes sure the controllers are registered.

📝 TODO or what's not covered (yet)

• Contract Testing an OAuth-protected API
• Publishing Pact contract files to a Pact Broker
• Non-.NET Core Consumers