path: fix win32 parse()

Fix path.win32.parse("/foo/bar") retuns `{root: '' ...}`(v5.7.0),
but not `{root: '/' ...}`(v5.6.0).
PR-URL: #5484
Reviewed-By: Brian White <mscdex@mscdex.net>
Reviewed-By: Roman Reiss <me@silverwind.io>

Author: zbinlin

lib/path.js

@@ -1007,8 +1007,8 @@ const win32 = {
 isAbsolute=true;
 
 code=path.charCodeAt(1);
+rootEnd=1;
 if(code===47/*/*/||code===92/*\*/){
-rootEnd=1;
 // Matched double path separator at beginning
 varj=2;
 varlast=j;

test/parallel/test-path-parse-format.js

@@ -20,6 +20,10 @@ const winPaths = [
 '\\\\?\\UNC\\server\\share'
 ];
 
+constwinSpecialCaseParseTests=[
+['/foo/bar',{root: '/'}]
+];
+
 constwinSpecialCaseFormatTests=[
 [{dir: 'some\\dir'},'some\\dir\\'],
 [{base: 'index.html'},'index.html'],
@@ -86,6 +90,7 @@ const errors = [
 
 checkParseFormat(path.win32,winPaths);
 checkParseFormat(path.posix,unixPaths);
+checkSpecialCaseParseFormat(path.win32,winSpecialCaseParseTests);
 checkErrors(path.win32);
 checkErrors(path.posix);
 checkFormat(path.win32,winSpecialCaseFormatTests);
@@ -184,6 +189,17 @@ function checkParseFormat(path, paths) {
 });
 }
 
+functioncheckSpecialCaseParseFormat(path,testCases){
+testCases.forEach(function(testCase){
+constelement=testCase[0];
+constexpect=testCase[1];
+constoutput=path.parse(element);
+Object.keys(expect).forEach(function(key){
+assert.strictEqual(output[key],expect[key]);
+});
+});
+}
+
 functioncheckFormat(path,testCases){
 testCases.forEach(function(testCase){
 assert.strictEqual(path.format(testCase[0]),testCase[1]);