test, url: URLSearchParams splits across lines

[watilde]

The member methods of URLSearchParams should split across multiple lines with util.inspect depending on an option breakLength.

This test increases the coverage of internal/url.js:

• https://coverage.nodejs.org/coverage-3429991d8b43474c/root/internal/url.js.html

The following line will be called:

• node/lib/internal/url.js

  Lines 1057 to 1059 in 82ddf96

  	if(breakLn){
  	outputStr=`\n ${outputStrs.join(',\n ')}`;
  	}else{

Checklist

• make -j4 test (UNIX) passes
• tests are included
• commit message follows commit guidelines

Affected core subsystem(s)

test,url

[jasnell]

LGTM with green CI

[jasnell]

CI: https://ci.nodejs.org/job/node-test-pull-request/6451/

[targos]

CI: https://ci.nodejs.org/job/node-test-pull-request/6469/

[targos]

Landed in 8629b33