Angular jasmine testing - postcss issue

[DSplawski-CC]

What version of Tailwind CSS are you using?

For example: v4.0.7

What build tool (or framework if it abstracts the build tool) are you using?

@angular-devkit/build-angular v19.1.8

What version of Node.js are you using?

For example: v22.9.0

What browser are you using?

Chrome

What operating system are you using?

Windows

Reproduction URL

https://github.com/DSplawski-CC/AngularTailwindCss

Just created Angular project in webstorm and followed instruction to install and configure tailwindcss for Angular
https://tailwindcss.com/docs/installation/framework-guides/angular

Describe your issue

It works fine when building or serving project, but it does not work when trying to run test via ng test

An unhandled exception occurred: It looks like you're trying to use tailwindcssdirectly as a PostCSS plugin. The PostCSS plugin has moved to a separate package, so to continue using Tailwind CSS with PostCSS you'll need to install@tailwindcss/postcssand update your PostCSS configuration.
at Re (F:\AngularTailwindCss\node_modules\tailwindcss\dist\lib.js:33:1716) at getStylesConfig (F:\AngularTailwindCss\node_modules\@angular-devkit\build-angular\src\tools\webpack\configs\styles.js:106:66) at async Promise.all (index 1) at async generateWebpackConfig (F:\AngularTailwindCss\node_modules\@angular-devkit\build-angular\src\utils\webpack-browser-config.js:74:22) at async generateBrowserWebpackConfigFromContext (F:\AngularTailwindCss\node_modules\@angular-devkit\build-angular\src\utils\webpack-browser-config.js:129:20) at async initializeBrowser (F:\AngularTailwindCss\node_modules\@angular-devkit\build-angular\src\builders\karma\browser_builder.js:109:24)