You have stubbed the function with one that does not return anything. FirstComponent.sayMyName = jest.fn(); To test the function, typically you can just do:
1 2 3 4 5 6 7 8 | // if static etc import { sayMyName } from '../foo/bar'; describe('bar', () => { it('should do what I like', () => { expect(sayMyName('orange')).toMatchSnapshot(); }); }) |
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