From API Description to Tests & Mocks

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Introduction

Introducing how to create HTTP stubs for your application and/or unit or UI tests. We're using the Mockingjay library in Swift to create these mocks.

• Level: beginner
• Workshop at FrenchKit 2017 conference.

Prerequisites

• Your Mac
• Xcode 8 or 9
• A bit of Swift…
• Paw (get the 30 days trial)

Today’s Agenda

• Intro & Presentation
• A simple XKCD client app with Alamofire
• Build mocks with Mockingjay
• A simple Instagram client app
• Create unit + UI tests with mocks

A – XKCD client app

1. Build a client app for the XKCD website (using their API)
2. Mock the API to make the tests pass independently from the API

B – Instagram API with the help of Paw

1. Introducing the Instagram API
2. Import the Instagram API in Paw File > Import > Find API Template
3. Download ready-to-go Paw file
4. Generate Alamofire code snippets with Paw
5. Build & run
6. Create a new Instagram client app – load your own Instagram feed

C – Integrate with Tests

Use the Instagram app for that, set up tests for each feature, and people can implement the stubs.

1. Build a unit test case for Instagram.loadImages(tag:, count:)
2. Use Paw to generate mocks from an existing response. Install Mockingjay Code Generator
3. Write mocks to test the API

D – JSON Schema Validation

1. Example of what JSON Schema is and used for
2. Add validation to your app to assert the server results