Hi @Sharma, Deepak,
Have you installed Jest and Enzyme? You can install them by following cmdlet
npm install enzyme enzyme-adapter-react-16 react-test-renderer @types/enzyme --save-dev --save-exact npm install jest jest-junit ts-jest @types/jest --save-dev --save-exact
And also you will need to setup the jest with spfx, please check the following steps in the nice article
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