mongoose-update-if-current | Optimistic concurrency plugin for mongoose | DB Client library

I suspect you are taking Stephen Grider's microservices course.

Did you rename src/__mocks__/stripe.ts to src/__mocks__/stripe.ts.old?

This looks like TS is working against the mock stripe module, not the real stripe module. Make sure to remove (or rename) src/__mocks__/stripe.ts.

If the mock stripe filename is the same as the module, then jest will use the mock stripe. Note, this applies even if you remove jest.mock('../../stripe');

From jest documentation:

When a manual mock exists for a given module, Jest's module system will use that module when explicitly calling jest.mock('moduleName'). However, when automock is set to true, the manual mock implementation will be used instead of the automatically created mock, even if jest.mock('moduleName') is not called. To opt out of this behavior you will need to explicitly call jest.unmock('moduleName') in tests that should use the actual module implementation.