Test case: using custom decoder

[balanza]

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Description

This PR introduces no changes but a failing test. It serves to demonstrate the existence of a bug spotted in https://github.com/pagopa/io-app/pull/2717. It adds 2 test:

1. using a custom decoder by passing it as an explicit <statusCode, responseDecoder> map
2. using a custom decoder by passing with an implicit interface, assuming it's going to be mapped to the default success status code.

Results

While the first test passes, the second fails. I understand this happens because the generated requestTypes modules ships a function isDecoder which is wrong in determining if the value passed is a decoder or a map of decoders; by failing this, it erroneously treat a single decoder as a map of decoders, hence the bug. Here the implementation.

Proposed solution

provide a working isDecoder implamentation

Mitigation

Just use an explicit decoder map. Please note that, given a aCustomDecoder decoder and a request with status as a default success status code, the following two instructions build the very same response decoder:

const responseDecoderA = myRequestDecoder(aCustomDecoder);
const responseDecoderB = myRequestDecoder({ [status]: aCustomDecoder });

How Has This Been Tested?

E2E test suites

[balanza]

/azp run

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