I primarily use Selenium WebDriver with C# for my testing tasks.
Is there a method to detect and record all JavaScript errors that may occur during the execution of my tests in Google Chrome?
Similar to the "JSErrorCollector" tool available for Firefox as mentioned here -
We are excited to announce that we now have a Chrome plug-in available! You can find it here - https://github.com/dharrya/ChromeJSErrorCollector
This Chrome plug-in is closely related to JSErrorCollector and offers similar functionalities.
In a recent discussion, Simeon Sinichkin highlighted the immense utility of ChromeJSErrorCollector in this context. For those working with C#, below is a snippet of sample code that demonstrates how to capture JS Errors and log them either to a file or the console:
var options = new ChromeOptions();
options.AddExtension("ChromeJSErrorCollector.crx");
var driver = new ChromeDriver(options);
// execute tests...
var javascriptDriver = driver as IJavaScriptExecutor;
var errors = javascriptDriver.ExecuteScript("return window.JSErrorCollector_errors ? window.JSErrorCollector_errors.pump() : []");
var writer = new StreamWriter("jsErrors.log");
var collection = errors as ReadOnlyCollection<object>;
foreach (var item in collection)
{
var errorObject = item as Dictionary<string, object>;
foreach (var field in errorObject)
{
Console.WriteLine(field.Key + " - " + field.Value);
writer.WriteLine(field.Key + " - " + field.Value);
}
Console.WriteLine("-------------------");
writer.WriteLine("-------------------");
}
writer.Flush();
writer.Close();
The resulting output will resemble the following format:
errorMessage - Error: Script error
http://requirejs.org/docs/errors.html#scripterror
lineNumber - 1795
pageUrl - http://someURL
sourceName - http://someURL/Scripts/require.js
-------------------
Although I haven't had experience working with Selenium, it seems like using window.onerror could be a useful tool for catching errors in the browser. You could then take action such as sending them to a database or log file. It's important to note that this method is not just limited to JavaScript errors but can also handle some HTTP errors.
For troubleshooting, utilize Chrome's developer tools by pressing ctrl+shift+i and examining the console tab for any reported errors.
In addition, Chrome allows you to establish breakpoints on specific lines within your code, enabling you to inspect the values of all variables during runtime.
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