Скачать или смотреть Resolving my-date-picker Not Recognized in Angular Karma After Upgrade from v7 to v8

Address the `my-date-picker` element error in Angular Karma tests after upgrading from version 7 to 8 and learn how to fix it effectively.
---
This video is based on the question https://stackoverflow.com/q/67833902/ asked by the user 'peterc' ( https://stackoverflow.com/u/2497278/ ) and on the answer https://stackoverflow.com/a/67833950/ provided by the user 'Antoniossss' ( https://stackoverflow.com/u/1527544/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Angular Karma error after upgrading Angular from v7 to v8

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Troubleshooting Angular Karma: Fixing the my-date-picker Error After Angular Upgrade

When upgrading an Angular project to a new version, it’s not uncommon to encounter issues that didn't exist in the previous version. One of the perplexing problems developers face involves template parse errors, particularly when encountering custom components like my-date-picker. If you've recently updated your Angular project from version 7 to version 8 using the ng update command, you may be experiencing this specific issue – don't worry! In this guide, we’ll dive into the problem and guide you through the steps to resolve it.

The Problem: Template Parse Errors

After upgrading to Angular v8, you may see errors like the following when you run your unit tests:

[[See Video to Reveal this Text or Code Snippet]]

Why This Error Occurs

This error generally occurs due to two main reasons:

Component Declaration: Angular needs to be aware of the components used within your templates. If the my-date-picker component is not properly declared within the module or test module, it won't recognize it.

Module Imports: If my-date-picker is declared in a different module, that module must be imported into the module where you are using it.

Solution: Fixing the my-date-picker Error

Let’s go through the steps to resolve this error. You have two main options to ensure that Angular recognizes your my-date-picker component.

Option 1: Update Declarations

You can explicitly declare your my-date-picker component within the test module. Here’s how to do it:

[[See Video to Reveal this Text or Code Snippet]]

Option 2: Import Module

If my-date-picker belongs to a module, you can simply import that module in your test setup, ensuring that its declarations are recognized by Angular. Here’s the code to demonstrate this:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

After following either of these solutions, your tests should run without encountering the my-date-picker recognition errors. Upgrading Angular versions often comes with challenges, but understanding how declarations and module imports work can help you troubleshoot efficiently.

If you’re still having trouble, make sure to double-check your module structure and ensure all necessary components and modules are properly declared and imported.

Next Steps

After resolving the issue, consider running your tests to confirm everything is functioning as expected.

Keep abreast of any new updates or changes in Angular that could affect your application and testing setup.

By taking these steps, you can enjoy the benefits of Angular v8 while keeping your project running smoothly. Happy coding!