create-react-app Has A Default Test Setup File
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In Configure Jest To Run A Test Setup File, I pointed to a way of configuring Jest in either the package.json or jest.config.js file with the setupTestFrameworkScriptFile value.
In a create-react-app project, this is not an option because setupTestFrameworkScriptFile is not one of the permitted config values for Jest.
There is a built-in value which happens to match what was recommended in the above post -- <rootDir>src/setupTests.js.
This means that there is no configuration required. Instead, just create a setupTests.js file in the src directory of your CRA project and add any framework setup you need there. That file is already configured to run when you invoke yarn test.