test: add http_incoming's matchKnownFields test

https://github.com/nodejs/node/blob/master/lib/_http_incoming.js#L136
Coverage: https://coverage.nodejs.org/coverage-57f6a106fbc69a47/root/_http_incoming.js.html
PR-URL: #10811
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Reviewed-By: Italo A. Casas <me@italoacasas.com>

Author: hiroppy

test/parallel/test-http-incoming-matchKnownFields.js

@@ -0,0 +1,90 @@
+'use strict';
+require('../common');
+constassert=require('assert');
+constIncomingMessage=require('http').IncomingMessage;
+
+functioncheckDest(field,result,value){
+constdest={};
+
+if(value)dest[field]='test';
+constincomingMessage=newIncomingMessage(field);
+// dest is changed by IncomingMessage._addHeaderLine
+incomingMessage._addHeaderLine(field,value,dest);
+assert.deepStrictEqual(dest,result);
+}
+
+checkDest('',{'': undefined});
+checkDest('Content-Type',{'content-type': undefined});
+checkDest('content-type',{'content-type': 'test'},'value');
+checkDest('User-Agent',{'user-agent': undefined});
+checkDest('user-agent',{'user-agent': 'test'},'value');
+checkDest('Referer',{referer: undefined});
+checkDest('referer',{referer: 'test'},'value');
+checkDest('Host',{host: undefined});
+checkDest('host',{host: 'test'},'value');
+checkDest('Authorization',{authorization: undefined},undefined);
+checkDest('authorization',{authorization: 'test'},'value');
+checkDest('Proxy-Authorization',{'proxy-authorization': undefined});
+checkDest('proxy-authorization',{'proxy-authorization': 'test'},'value');
+checkDest('If-Modified-Since',{'if-modified-since': undefined});
+checkDest('if-modified-since',{'if-modified-since': 'test'},'value');
+checkDest('If-Unmodified-Since',{'if-unmodified-since': undefined});
+checkDest('if-unmodified-since',{'if-unmodified-since': 'test'},'value');
+checkDest('Form',{form: undefined});
+checkDest('form',{form: 'test, value'},'value');
+checkDest('Location',{location: undefined});
+checkDest('location',{location: 'test'},'value');
+checkDest('Max-Forwards',{'max-forwards': undefined});
+checkDest('max-forwards',{'max-forwards': 'test'},'value');
+checkDest('Retry-After',{'retry-after': undefined});
+checkDest('retry-after',{'retry-after': 'test'},'value');
+checkDest('Etag',{etag: undefined});
+checkDest('etag',{etag: 'test'},'value');
+checkDest('Last-Modified',{'last-modified': undefined});
+checkDest('last-modified',{'last-modified': 'test'},'value');
+checkDest('Server',{server: undefined});
+checkDest('server',{server: 'test'},'value');
+checkDest('Age',{age: undefined});
+checkDest('age',{age: 'test'},'value');
+checkDest('Expires',{expires: undefined});
+checkDest('expires',{expires: 'test'},'value');
+checkDest('Set-Cookie',{'set-cookie': [undefined]});
+checkDest('set-cookie',{'set-cookie': [undefined]});
+checkDest('Transfer-Encoding',{'transfer-encoding': undefined});
+checkDest('transfer-encoding',{'transfer-encoding': 'test, value'},'value');
+checkDest('Date',{date: undefined});
+checkDest('date',{date: 'test, value'},'value');
+checkDest('Connection',{connection: undefined});
+checkDest('connection',{connection: 'test, value'},'value');
+checkDest('Cache-Control',{'cache-control': undefined});
+checkDest('cache-control',{'cache-control': 'test, value'},'value');
+checkDest('Transfer-Encoding',{'transfer-encoding': undefined});
+checkDest('transfer-encoding',{'transfer-encoding': 'test, value'},'value');
+checkDest('Vary',{vary: undefined});
+checkDest('vary',{vary: 'test, value'},'value');
+checkDest('Content-Encoding',{'content-encoding': undefined},undefined);
+checkDest('content-encoding',{'content-encoding': 'test, value'},'value');
+checkDest('Cookies',{cookies: undefined});
+checkDest('cookies',{cookies: 'test, value'},'value');
+checkDest('Origin',{origin: undefined});
+checkDest('origin',{origin: 'test, value'},'value');
+checkDest('Upgrade',{upgrade: undefined});
+checkDest('upgrade',{upgrade: 'test, value'},'value');
+checkDest('Expect',{expect: undefined});
+checkDest('expect',{expect: 'test, value'},'value');
+checkDest('If-Match',{'if-match': undefined});
+checkDest('if-match',{'if-match': 'test, value'},'value');
+checkDest('If-None-Match',{'if-none-match': undefined});
+checkDest('if-none-match',{'if-none-match': 'test, value'},'value');
+checkDest('Accept',{accept: undefined});
+checkDest('accept',{accept: 'test, value'},'value');
+checkDest('Accept-Encoding',{'accept-encoding': undefined});
+checkDest('accept-encoding',{'accept-encoding': 'test, value'},'value');
+checkDest('Accept-Language',{'accept-language': undefined});
+checkDest('accept-language',{'accept-language': 'test, value'},'value');
+checkDest('X-Forwarded-For',{'x-forwarded-for': undefined});
+checkDest('x-forwarded-for',{'x-forwarded-for': 'test, value'},'value');
+checkDest('X-Forwarded-Host',{'x-forwarded-host': undefined});
+checkDest('x-forwarded-host',{'x-forwarded-host': 'test, value'},'value');
+checkDest('X-Forwarded-Proto',{'x-forwarded-proto': undefined});
+checkDest('x-forwarded-proto',{'x-forwarded-proto': 'test, value'},'value');