old_contents: 
  var t = 0;
  const exec = require('child_process').exec;
  exec('node nodejs_app/app.js', function(error, stdout, stderr){
    if (error) {
      console.error('exec error: ${error}');
  	t =1;
      return 1;
    }
   else{
  	 
    console.log('stdout: ${stdout}');
    console.log('stderr: ${stderr}');
    return 0;
   }
  });
  
  exec('node nodejs_app/app.js', function(error, stdout, stderr){
    if (error) {
      console.error('exec error: ${error} ');
  	  console.log("$!");
  	t =1;
  		 exec('killall node echo $!');
  	  return 0;
  		      
      
    }
   else{
  	 
    console.log('stdout: ${stdout}');
    console.log('stderr: ${stderr}');
  
    return 1;
   }
  });
  
new_contents: 
  var t = 0;
  const exec = require('child_process').exec;
  exec('node nodejs_app/app.js', function(error, stdout, stderr){
    if (error) {
      console.error('exec error: ${error}');
  	t =1;
      return 1;
    }
   else{
  	 
    console.log('stdout: ${stdout}');
    console.log('stderr: ${stderr}');
    return 0;
   }
  });
  
  exec('node nodejs_app/app.js', function(error, stdout, stderr){
    if (error) {
      console.error('exec error: ${error} ');
  	  console.log("$?");
  	t =1;
  		 exec('killall node echo $?');
  	  return 0;
  		      
      
    }
   else{
  	 
    console.log('stdout: ${stdout}');
    console.log('stderr: ${stderr}');
  
    return 1;
   }
  });
  
subject: Update testsA.js