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import Foo from './Foo';
import Bar from './Bar';
jest.mock('./Bar');
describe('Foo', () => {
it('should return correct foo', () => {
// As Bar is already mocked,
// we just need to cast it to jest.Mock (for TypeScript) and mock whatever you want
(Bar.prototype.runBar as jest.Mock).mockReturnValue('Mocked bar');
const foo = new Foo();
expect(foo.runFoo()).toBe('real foo : Mocked bar');
});
});
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