test: refactor spawnSync() cwd test

This commit refactors test-child-process-spawnsync.js to use the reusable common.spawnSyncPwd(). PR-URL: #6939 Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Ben Noordhuis <[email protected]>

Author: cjihrig

test/parallel/test-child-process-spawnsync.js

@@ -18,21 +18,13 @@ assert.strictEqual(ret_err.syscall, 'spawnSync command_does_not_exist');
 assert.strictEqual(ret_err.path,'command_does_not_exist');
 assert.deepEqual(ret_err.spawnargs,['bar']);
 
-// Verify that the cwd option works - GH #7824
-(function(){
-varresponse;
-varcwd;
-
-if(common.isWindows){
-cwd='c:\\';
-response=spawnSync('cmd.exe',['/c','cd'],{cwd: cwd});
-}else{
-cwd='/';
-response=spawnSync('pwd',[],{cwd: cwd});
-}
+{
+// Test the cwd option
+constcwd=common.isWindows ? 'c:\\' : '/';
+constresponse=common.spawnSyncPwd({cwd});
 
 assert.strictEqual(response.stdout.toString().trim(),cwd);
-})();
+}
 
 {
 // Test the encoding option