make http test suite run http2 compat

[ronag]

I think in theory it should be possible to run the http2 compat code using the http tests. The main thing missing is a http2 compat replacement for http.request. If we have that I believe we could make all the http test run using http2 compat by monkey patching http?

Is this something that would be worth looking into?

Right now we seem to have 2 test suites for testing almost the same things.

[jasnell]

I think it's worth exploring but it's going to be quite difficult to do, I think. Many of the http tests rely on internals that are very different in http2, even with the compat layer, and there are many tests that simply do not translate.

[DaAitch]

@ronag I agree it would be a cool thing to write one test and test 2 modules. I did a small adaptation of a simple test, and I agree: without a http.request compat it will be hard to do it. I ended up with a very lean impl of http.request just to get the test green.
You can check #dee7447.

[ronag]

Close in favor of #29829