test: replace concatenation with template literals

PR-URL: #14293 Reviewed-By: Rich Trott <[email protected]> Reviewed-By: Michaël Zasso <[email protected]> Reviewed-By: Gibson Fahnestock <[email protected]> Reviewed-By: Benjamin Gruenbaum <[email protected]> Reviewed-By: Gireesh Punathil <[email protected]>

Author: 笑斌

test/inspector/inspector-helper.js

@@ -393,7 +393,7 @@ Harness.prototype.addStderrFilter = function(regexp, callback){
 
 Harness.prototype.assertStillAlive=function(){
 assert.strictEqual(this.running_,true,
-'Child died: '+JSON.stringify(this.result_));
+`Child died: ${JSON.stringify(this.result_)}`);
 };
 
 Harness.prototype.run_=function(){

test/parallel/test-https-server-keep-alive-timeout.js

@@ -12,8 +12,8 @@ const fs = require('fs');
 consttests=[];
 
 constserverOptions={
-key: fs.readFileSync(common.fixturesDir+'/keys/agent1-key.pem'),
-cert: fs.readFileSync(common.fixturesDir+'/keys/agent1-cert.pem')
+key: fs.readFileSync(`${common.fixturesDir}/keys/agent1-key.pem`),
+cert: fs.readFileSync(`${common.fixturesDir}/keys/agent1-cert.pem`)
 };
 
 functiontest(fn){

test/sequential/test-debugger-debug-brk.js

@@ -4,7 +4,7 @@ common.skipIfInspectorDisabled();
 constassert=require('assert');
 constspawn=require('child_process').spawn;
 
-constscript=common.fixturesDir+'/empty.js';
+constscript=`${common.fixturesDir}/empty.js`;
 
 functiontest(arg){
 constchild=spawn(process.execPath,['--inspect',arg,script]);