# React Inversion Of Control Web Part with Unit Tests using Jest and Enzyme ## Summary This web part is provided as an example of implementing an IoC (Inversion of Control) pattern in the context of a SharePoint Framework web part. Following this pattern greatly improves the modularity, maintainability, and testability of the code. The example includes 100% test coverage, using Jest and Enzyme, of .ts and .tsx files, excluding *WebPart.ts files. A dependency injector class specific to a web part class is used to map web part properties to component properties and create dependencies. This pattern is designed to remove logic from the *WebPart.ts file, the only ts file that isn't unit tested, and hence ensure that all relevant web part logic is tested. Included in the coverage is a cache and logger class, along with a service class that fetches data asychronously using @PnP/sp and dynamic bundling. The example also includes a pipeline definition .yaml file for Azure DevOps CI build pipeline (/pipelines/) which includes the build, running tests, and posting the test coverage results. ![Sample SPFx Web Part implementing IoC pattern](./assets/preview.jpg) ## Used SharePoint Framework Version ![drop](https://img.shields.io/badge/version-1.8.0-green.svg) ## Applies to * [SharePoint Framework](https:/dev.office.com/sharepoint) * [Office 365 tenant](https://dev.office.com/sharepoint/docs/spfx/set-up-your-development-environment) ## Solution Solution|Author(s) --------|--------- react-ioc-tests | Paul Ryan ## Version history Version|Date|Comments -------|----|-------- 1.0|March 20, 2019|Initial release ## Disclaimer **THIS CODE IS PROVIDED *AS IS* WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING ANY IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, OR NON-INFRINGEMENT.** --- ## Minimal Path to Awesome - Clone this repository - in the command line run: - `npm install` - *`npm test`* - `gulp serve` ## Features This web part is provided as an example of implementing an IoC (Inversion of Control) pattern in the context of a SharePoint Framework web part. This Web Part illustrates the following concepts on top of the SharePoint Framework: - Inversion of Control pattern - Unit testing with Jest and Enzyme - Azure DevOps CI Build Pipeline yaml definition file, includes running tests and checking code coverage ## References https://github.com/SharePoint/sp-dev-fx-webparts/tree/master/samples/react-jest-testing https://blog.velingeorgiev.com/unit-test-your-sharepoint-framework-solution-with-jest https://www.eliostruyf.com/sharepoint-framework-unit-tests-with-jest/ https://github.com/estruyf/spfx-testing-jest