Last Updated: 21 May 2024 09:03 by William

A click step might throw ArgumentNullException when executed against a pop up that is in the process of being opened.


Exception 'System.ArgumentNullException: Value cannot be null.

Parameter name: source
   at System.Linq.Enumerable.Where[TSource](IEnumerable`1 source, Func`2 predicate)
   at ArtOfTest.WebAii.DesktopAutomation.DesktopFind.GatherResultsFromXPathSearch(String xPath, Int32 maxDepth, DesktopFindExpressionGroup group, List`1 roots, List`1 results)
   at ArtOfTest.WebAii.DesktopAutomation.DesktopFind.<>c__DisplayClass26_0.<AllByExpression>b__0()
   at ArtOfTest.WebAii.DesktopAutomation.DesktopFind.RetryIfNullOrEmpty[T](Int32 retries, Int32 retryDelay, Func`1 findFunc)
   at ArtOfTest.WebAii.DesktopAutomation.DesktopFind.AllByExpression(DesktopFindExpression expression, Int32 maxDepth, Int32 maxRetries, Int32 retryDelay)
   at ArtOfTest.WebAii.Design.Execution.ExecutionUtils.FindElementInternal(IAutomationHost targetHost, FindExpressionElement expression, Region region, String& error)
   at ArtOfTest.WebAii.Design.Execution.ExecutionUtils.FindTargets(IAutomationHost targetHost, AutomationDescriptor baseDescriptor)
In Development
Last Updated: 16 May 2024 13:23 by ADMIN

Steps to reproduce:

  1. Schedule a test list with 'Rerun failed tests' option set to true. 
  2. The project to upload to Storage needs to produce a compilation error upon execution. 
  3. Check the test results.

Expected: The test list run does not execute any of the tests due to the compilation error and logs a failed test list result.

Actual: The test list run does not execute any of the tests due to the compilation error and logs a passed test list result.


In Development
Last Updated: 14 May 2024 13:45 by ADMIN

Steps to reproduce:

1. Add the following line in coded step 


2. Execute the test in extensionless/headless mode

Expected: Test should pass
Actual: Test fails and the following error is thrown in the log:

ArtOfTest.WebAii.Exceptions.ExecuteCommandException: ExecuteCommand failed!
InError set by the client. Client Error:
Protocol error (Input.dispatchKeyEvent): Invalid 'text' parameter
BrowserCommand (Type:'Action',Info:'NotSet',Action:'RealKeyboardAction',Target:'null',Data:'keyDown#$TS$#LMenu',ClientId:'59E9D6A07CE0CD30467ED59AEC375281',HasFrames:'False',FramesInfo:'',TargetFrameIndex:'-1',InError:'True',Response:'Protocol error (Input.dispatchKeyEvent): Invalid 'text' parameter')
InnerException: none.

   at ArtOfTest.WebAii.Core.Browser.ExecuteCommandInternal(BrowserCommand request)
   at ArtOfTest.WebAii.Core.Browser.ExecuteCommand(BrowserCommand request, Boolean performDomRefresh, Boolean waitUntilReady)
   at ArtOfTest.WebAii.Headless.HeadlessKeyboard.PressOrReleaseKey(Keys key, Boolean release)
   at ArtOfTest.WebAii.Win32.KeyBoard.KeyDown(Keys code, Boolean delay)
   at ArtOfTest.WebAii.Win32.KeyBoard.KeyPress(Keys code)
   at Regressuib2024R2.Alt.Alt_CodedStep() in C:\Users\ittodorov\Documents\Test Studio Projects\Regressuib2024R2\Alt.tstest.cs:line 57

In Development
Last Updated: 10 May 2024 13:34 by ADMIN

Using the default Startup Args when configuring WPF test are not applied correctly. 

The workaround is to use the startup arguments set for each test configuration. 

In Development
Last Updated: 02 May 2024 11:36 by ADMIN

For a specific page (shared internally)

1.Record a navigate step
2. Execute the recorded test in headless/extensionless

Expected: The test should pass
Actual: The navigate step fails and the following exception is thrown in the log:

Failure Information:
ExecuteCommand failed!
BrowserCommand (Type:'Information',Info:'IsReady',Action:'NotSet',Target:'null',Data:'',ClientId:'8DBC801FE56B61C67C029E52C7448B0C',HasFrames:'False',FramesInfo:'',TargetFrameIndex:'-1',InError:'False',Response:'')
InnerException: System.TimeoutException: Timed out waiting for command to be handled
   at ArtOfTest.WebAii.Messaging.Process.BrowserHostsProxyRemoted.ProcessBrowserRequest(BrowserCommand command, String requestId, Int32 timeout)
   at ArtOfTest.WebAii.Messaging.Process.BrowserHostsProxyRemoted.ProcessBrowserRequest(BrowserCommand command, String requestId)
   at ArtOfTest.WebAii.Core.Browser.ExecuteCommandInternal(BrowserCommand request)

Workaround: Use a coded step to increase the ExecuteCommandTimeout like this: 


Last Updated: 30 Apr 2024 08:12 by Jeff

I need to export the contents of our test lists to a CSV, TXT or Excel file. There is no option other than exporting the generated results from a test list run. 

However I need to be able to export the tests in a test list before I get to the point of executing these. 

In Development
Last Updated: 24 Apr 2024 15:37 by ADMIN

Test Studio supports adding a single custom base test class in the project. If one more base test class is defined and listed in a test code-behind file, the coded steps will be listed as empty and will not show the option to choose any of the methods in the test class.The steps will be still executed, but no changes can be applied within Test Studio (only in VS).

because I want many test sharing the same OnAfterTestCompleted(), instead of adding it to each test, I created new class:


namespace test_studio_tests
    public class CustomWebAiiTest : BaseWebAiiTest
        public override void OnAfterTestCompleted(TestResult result)
            // some code to be executed 

and then all the tests to inherit from this new class

public class TestClass : CustomWebAiiTest

instead of Base one as they did so far. in TS project keep compiling, but then all the tests have extra icon and coded steps are not recognized anymore. in the meantime in VS2022 with TS plugin, all is recognized and keep working without any issue.

Last Updated: 24 Apr 2024 11:33 by Marek

There is a dialogbox in WPF app to which the recorder toolbar gets attached. When the highlighting is enabled for this window no of the elements get highlighted.

The workaround is to use the DOM explorer tab in the Advanced Recording Tools to locate the desired element and build the desired step that way. 

Details for the dialogbox and app shared internally! 

Need More Info
Last Updated: 19 Apr 2024 09:31 by ADMIN

We've posted about this before, tickets and forum.



Attached is the log of a different failed scenario. Unlike ticket 1621768, there is no execution delay (hardcoded) before the error. To be sure, we get what seems to be random failed tests that run successful more often than not in most prior runs. What seems constant is that our test lists will encounter errors in an automated Azure pipeline run (if we then run that same pipeline manually, it's usually successful).

Is there something we can do to the environment that we are running the test lists, the settings or something of that nature? Maybe some way to "prime" the environment?

Note, our license is under bwhite@mlhc.com

Last Updated: 15 Apr 2024 13:41 by ADMIN
When trying to connect to Git repo in Azure DevOps the connection is reported successful. Then, however, all supported commands are not performed as expected. The message in SourceControl output is: too many redirects or authentication replays. 
Pending Review
Last Updated: 11 Apr 2024 12:05 by Jim
Created by: Jim
Comments: 0
Type: Feature Request

Once I have the browser up and running I don't need to start from 'Log onto URL'. Hence my high partial test run use.
I may be only running part of a test, but when the test is 500 steps its cumbersome to highlight the section I want to run, and where to stop.
It would be much easier to set a breakpoint, run the part of the test I need, and stop midway.

In Development
Last Updated: 05 Apr 2024 12:55 by ADMIN

Error upon compilation is related to the Pages.g.cs file where all elements are listed with their find expression. 

12:38:44 'ERROR' > C:\Users\dpruteanu\Test Studio Projects\After_reinstall_3-27-24\Pages.g.cs(229,108) : error CS1003: Syntax error, ',' expected

Steps to reproduce: 

  1. Testing WPF app which has quotation mark in the name of the window.
  2. Record some steps for a scenario.
  3. Convert any step to code, or insert a coded step.
  4. Compile the project.

Expected: The compilation is successful.
Actual: The compilation fails with the mentioned error. 

Last Updated: 29 Mar 2024 13:22 by Marek

There is no option in Test Studio recording capabilities to add a step which sets value for the WPF RadSlider control. It will be useful to have such similar to the WPF slider control. 

The workaround is to set this in a coded step like this:

// Accepts values from 0 to 1
Applications.SliderTestexe.MainWindow.Item0Radslider.Value = 0.25;

Last Updated: 21 Mar 2024 12:57 by Max
Enter text step added from the Step Builder has the 'Encrypt' property greyed out and there is no option to make it active and use it. 
Last Updated: 20 Mar 2024 16:08 by Tomáลก

Although the actual image files are with good resolution and are smooth, when displayed in the Failure Details Images tab they are blurry. 

It will be great to display the images better. 

In Development
Last Updated: 20 Mar 2024 13:06 by ADMIN

 public static DesktopFind WaitForDesktopAppWindow(DesktopApplication desktopApp, string strWindowsName)
      return desktopApp.WaitForWindow(strWindowsName, delay, 60000).Find; //with a delay of 700


fails if COMException is thrown.

Expected is to handle that exception and wait for the set timeout. 

In Development
Last Updated: 18 Mar 2024 14:47 by ADMIN
A wpf application does not start correctly in Test Studio because the working directory cannot be specified.
Last Updated: 15 Mar 2024 09:35 by ADMIN
Created by: Vera
Comments: 0
Type: Feature Request
Support for VS Community Edition 
Last Updated: 15 Mar 2024 09:33 by ADMIN

When generating chained find expressions Test Studio always uses the id tribute for the parent element and it doesn't take into account the actual order of attributes.

Then, if you completely remove the id from the find logic list settings, the generated find expression uses only TagIndex for the target element and no chained find expression. 

Generating this type of expressions need to be revised. 

Example shared internally!

Last Updated: 15 Mar 2024 09:31 by ADMIN
Building the find expressions for elements in HTML during recording respects the Identification Logic:

That isn't the case when Test Studio builds chained expressions though (e.g. it cannot find an Id or Name to build direct expression thus locates a unique parent element to include in the find logic.

In this case TS respects the Id or Name only and not the rest of the attributes (including custom ones).

It will be nice if the chained find expressions building algorithm is extended to respect the preset identification logic as well.
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