[Solved] License activation fails in Karma jasmine unit tests with Angular 21

[Dhanabal]

I am able to run the Angular application locally without any errors. However, when executing Jasmine/Karma unit tests locally, I intermittently encounter the following error:

SyntaxError: Unexpected end of JSON input
    at JSON.parse (<anonymous>)
    at node_modules/@progress/kendo-licensing/dist/index.mjs:1:1826
    at node_modules/@progress/kendo-licensing/dist/index.mjs:1:1834
    at Array.map (<anonymous>)
    at a (node_modules/@progress/kendo-licensing/dist/index.mjs:1:1740)
    at N (node_modules/@progress/kendo-licensing/dist/index.mjs:1:20086)
    at validatePackage (node_modules/@progress/kendo-licensing/dist/index.mjs:1:20917)
    at new _ComboBoxComponent (
        node_modules/@progress/kendo-angular-dropdowns/fesm2022/progress-kendo-angular-dropdowns.mjs:5603:9
    )
    at NodeInjectorFactory.factory (
        node_modules/@progress/kendo-angular-dropdowns/fesm2022/progress-kendo-angular-dropdowns.mjs:6520:16
    )
    at getNodeInjectable (
        http://localhost:9876/darwin_arm64-fastbuild-ST-fdfa778d11ba/bin/packages/core/src/render3/di.ts:785:38
    )

At the same time, the following warnings appear in the test output:

WARN: 'No Telerik and Kendo UI License found.
To download a license key file, visit https://prgress.co/3PwQMKZ'

Also, the error is not consistent. I am receiving same licensing error from kendo grid package.

Chrome Headless 146.0.0.0 (Windows 10) KendoGridComponent can load instance FAILED
	SyntaxError: Unexpected end of JSON input
	    at JSON.parse (<anonymous>)
	    at node_modules/@progress/kendo-licensing/dist/index.mjs:1:1826
	    at map (node_modules/@progress/kendo-licensing/dist/index.mjs:1:1835)
	    at Array.map (<anonymous>)
	    at a (node_modules/@progress/kendo-licensing/dist/index.mjs:1:1740)
	    at N (node_modules/@progress/kendo-licensing/dist/index.mjs:1:8844)
	    at getLicenseMessage (node_modules/@progress/kendo-angular-common/fesm2022/progress-kendo-angular-common.mjs:1485:36)
	    at new GridComponent (node_modules/@progress/kendo-angular-grid/fesm2022/progress-kendo-angular-grid.mjs:33359:48)
	    at NodeInjectorFactory.factory (node_modules/@progress/kendo-angular-grid/fesm2022/progress-kendo-angular-grid.mjs:34710:16)
	    at getNodeInjectable (node_modules/@angular/core/fesm2022/_debug_node-chunk.mjs:1044:38)

Environment Details

• Angular version: 21.2
• Kendo UI components: Version 23.3.0 (full list below)
• @progress/kendo-licensing: ^1.11.0

"@progress/kendo-angular-buttons": "^23.3.0",
"@progress/kendo-angular-dateinputs": "^23.3.0",
"@progress/kendo-angular-dialog": "^23.3.0",
"@progress/kendo-angular-dropdowns": "^23.3.0",
"@progress/kendo-angular-excel-export": "^23.3.0",
"@progress/kendo-angular-grid": "^23.3.0",
"@progress/kendo-angular-icons": "^23.3.0",
"@progress/kendo-angular-indicators": "^23.3.0",
"@progress/kendo-angular-inputs": "^23.3.0",
"@progress/kendo-angular-intl": "^23.3.0",
"@progress/kendo-angular-l10n": "^23.3.0",
"@progress/kendo-angular-label": "^23.3.0",
"@progress/kendo-angular-layout": "^23.3.0",
"@progress/kendo-angular-menu": "^23.3.0",
"@progress/kendo-angular-navigation": "^23.3.0",
"@progress/kendo-angular-pager": "^23.3.0",
"@progress/kendo-angular-pdf-export": "^23.3.0",
"@progress/kendo-angular-popup": "^23.3.0",
"@progress/kendo-angular-progressbar": "^23.3.0",
"@progress/kendo-angular-toolbar": "^23.3.0",
"@progress/kendo-angular-treeview": "^23.3.0",
"@progress/kendo-angular-upload": "^23.3.0",
"@progress/kendo-angular-utils": "^23.3.0",
"@progress/kendo-data-query": "^1.7.4",
"@progress/kendo-drawing": "^1.25.0",
"@progress/kendo-svg-icons": "^4.8.0",
"@progress/kendo-angular-common": "^23.3.0",
"@progress/kendo-angular-conversational-ui": "^23.3.0",

What I’ve Tried

I followed the solutions suggested in the Telerik forum thread below, but the issue still occurs intermittently during unit test execution:

• License activation fails in jasmine unit tests in Kendo UI for Angular | Telerik Forums

Question

Why does the Kendo licensing validation fail only during Jasmine unit tests, while the application runs normally, and how can this be reliably resolved or mocked for unit testing?