Fix error when http module is mock in tests

[ardiadrianadri]

Hello:

Let me explain to you the problem that I am trying to solve with this PR. The problem I found is that, when I create a mock with the Jest library of Http for my unit tests, the tests fails. The reason is because the module application.js from the express library, which has a dependency on "methods", obtaining an empty array of methods ... and that ends with an exception. The problem comes because, when I make the mock of the http library with Jest, the value of * http.METHODS * is [] which it is evaluated as true and makes the function * getBasicNodeMethods * never run.

My changes are, basically, to check that he http.METHODS array exist and its length is different of 0 so, it that way, the library http can be mock for unit testing.

Regards

[dougwilson]

Thanks. Please add a test to prevent this change from regressing.

[ardiadrianadri]

Test added

[dougwilson]

Thank you for adding a test, but I apologize, as I don't think I really articulated what my thoughts were on that point when I left the original comment from my phone.

Just like we suppose the Browserify stuff and the tests actually use Browserify, I think that it's find to support this Jest thing you're talking about, but the test should use Jest to assert that we remain compatible with the Jest issue, especially so we know when a future version of Jest changes how this works.

In addition, I forgot to mention the first time, this behavior / Jest thing needs to be documented in the README along with the other support 👍