Comments (5)
@jmcdo29 yes, I agree, but people like myself will still arrive here looking for a decorator unit test. Hopefully they will find this issue and your comment.
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It sounds like this is not a decorator created with Nest's createParamDecorator
, for controllers, resolvers, and gateways, but a general typescript decorator, is that correct?
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Yes, it is a custom Decorator that consumes Redis for caching data, it creates a key based on the method name and passed arguments to the function. Its like memoization decorator for Service Methods
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I was looking for a sample of a unit test for a param decorator, and suggest you include one here for completeness.
AFAICT, the best way to test a param decorator is to test the factory (CustomParamFactory), that is passed to createParamDecorator, in isolation. To test the ParameterDecorator itself would require a lot of scaffolding.
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Honestly, I would worry about testing a custom decorator via integration and e2e tests that use actual HTTP requests. If you do want to have an easy way to test the factory inside the decorator you'd need to do something like
export const myParamFactory = (data: unknown, context: ExecutionContext) => {
return context.switchToHttp().getRequest()['custom-property'];
}
export const MyParam = createParamDecorator(myParamFactory);
And now you can just call myParamFactory
directly in a test while mocking the ExecutionContext
. I'll see about adding a sample for this, or feel free to create one with this knowledge and open a PR
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