74 lines
3.2 KiB
Markdown
74 lines
3.2 KiB
Markdown
# React Inversion Of Control with Unit Tests using Jest and Enzyme
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## Summary
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This web part is provided as an example of implementing an IoC (Inversion of Control) pattern, primarily to enable unit testing, in the context of a SharePoint Framework web part.
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Following this pattern greatly improves the modularity, maintainability, and testability of the code.
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The example includes 100% test coverage, using Jest and Enzyme, of .ts and .tsx files, excluding *WebPart.ts files. A dependency resolver class specific to a web part class is used to map web part properties to component properties and create any dependent services/providers.
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This pattern is implemented to separate testable logic from the untestable *WebPart.ts file and hence ensure that all relevant web part logic is tested. To this end, a Service class is paired with a ServiceExecutor class which should extract the actual service requests from other service logic ensuring that the Service class remains fully testable. *Executor classes are excluded from test coverage as they cannot be unit tested by design - as they are points integration.
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Included in the coverage is a cache and logger class, along with a service class that fetches data asynchronously using @pnp/sp 2.x
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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.
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## Used SharePoint Framework Version
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## Applies to
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* [SharePoint Framework](https://docs.microsoft.com/sharepoint/dev/spfx/sharepoint-framework-overview)
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* [Office 365 tenant](https://docs.microsoft.com/sharepoint/dev/spfx/set-up-your-development-environment)
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## Solution
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Solution|Author(s)
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--------|---------
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react-ioc-tests | Paul Ryan
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## Version history
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Version|Date|Comments
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-------|----|--------
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1.0|March 20, 2019|Initial release
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## Disclaimer
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**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.**
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---
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## Minimal Path to Awesome
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- Clone this repository
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- in the command line run:
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- `npm install`
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- `npm bundle`
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- *`npm test`*
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- `gulp serve`
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## Features
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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 for maximising testability.
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This Web Part illustrates the following concepts on top of the SharePoint Framework:
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- Inversion of Control pattern
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- Unit testing with Jest and Enzyme
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- Azure DevOps CI Build Pipeline yaml definition file, includes running tests and checking code coverage
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## References
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https://github.com/pnp/sp-dev-fx-webparts/tree/main/samples/react-jest-testing
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https://blog.velingeorgiev.com/unit-test-your-sharepoint-framework-solution-with-jest
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https://www.eliostruyf.com/sharepoint-framework-unit-tests-with-jest/
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https://github.com/estruyf/spfx-testing-jest
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<img src="https://telemetry.sharepointpnp.com/sp-dev-fx-webparts/samples/react-ioc-tests" />
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