Reading and writing to a file in a UI automation using JavaScript: Tips and tricks

While running, I need to identify several properties and create a json object that I want to write to a ".json" file and save on disk.

var target = UIATarget.localTarget();
var properties = new Object();
var jsonObjectToRecord = {"properties":properties}
jsonObjectToRecord.properties.name = "My App"
UIALogger.logMessage("Pretty Print TEST Log"+jsonObjectToRecord.properties.name);
var str = JSON.stringify(jsonObjectToRecord)
UIALogger.logMessage(str);
// -- CODE TO WRITE THIS JSON TO A FILE AND SAVE ON THE DISK --

I attempted :

// Sample code to see if it is possible to write data
// onto some file from my automation script
function WriteToFile()
 {

    set fso = CreateObject("Scripting.FileSystemObject");  
    set s = fso.CreateTextFile("/Volumes/DEV/test.txt", True);
    s.writeline("HI");
    s.writeline("Bye");
    s.writeline("-----------------------------");
    s.Close();
 }

AND

function WriteFile()
{
    // Create an instance of StreamWriter to write text to a file.
    sw = new StreamWriter("TestFile.txt");
    // Add some text to the file.
    sw.Write("This is the ");
    sw.WriteLine("header for the file.");
    sw.WriteLine("-------------------");
    // Arbitrary objects can also be written to the file.
    sw.Write("The date is: ");
    sw.WriteLine(DateTime.Now);
    sw.Close();
}

However, I am still struggling to read and write data to files from ui automation instruments.

Possible solution ?? Consider redirecting to stdout by executing a terminal command from my ui automation script. Can we execute a terminal command from the script?

Have not yet tried: 1. Assuming we can include the library with those methods and give it a try.

Answer №1

Your assumptions are accurate, however the XCode UI Automation script is not built on full JavaScript.

It's not possible to simply write browser-based JavaScript within the XCode UI Automation script.

set fso = CreateObject("Scripting.FileSystemObject");

This is VBScript, not JavaScript, and it only functions in Microsoft platforms and testing tools like QTP.

Scripting.FileSystemObject

An ActiveX object that is specific to Microsoft Windows.

The Apple JavaScript library offers limited functionality, primarily basic Math and Array functions. You can find the available classes here: https://developer.apple.com/library/ios/documentation/DeveloperTools/Reference/UIAutomationRef/

If you need more advanced scripting capabilities, consider using Selenium IOS Driver at

Answer №2

While working on a project, I dabbled with the idea of implementing a bash script to write to a file. Although I never completed this task, I can provide guidance on how to create and execute the script.

To begin, you'll need to develop a simple bash script that writes to a file:

#!/bin/bash
echo $1 >> ${filename.json}

Next, you can call this script within your Xcode Instruments UIAutomation tool using the following code:

var target = UIATarget.localTarget();
var host = target.host();

var result = host.performTaskWithPathArgumentsTimeout("your/script/path", ["Object description in JSON format"], 5);

Once your automation process is complete, you can access the file on your computer to review the results.

Additionally, keep in mind that while this approach allows for writing to a file line by line, the actual JSON formatting will require some customization. Take your time to consider the formatting specifics before implementation.

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