Thursday, April 21, 2016

Recording Selenium test execution with Expression Encoder 4 SDK fails on build server

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We run Selenium tests nightly on our TeamCity build server.

We have some tests that fail intermittenly during our nightly run.

Screenshots of failed tests haven't really provided an answer, so I want to record the execution of failed tests.

I have implemented the following to record test execution of tests I want to investigate.

        ScreenCaptureJob = new ScreenCaptureJob         {             CaptureRectangle = Screen.PrimaryScreen.Bounds,             ShowFlashingBoundary = true,             OutputPath = outputPath         };          ScreenCaptureJob.Start();          Debug.WriteLine($"Status: {ScreenCaptureJob.Status}");          Test code...          ScreenCaptureJob.Stop(); 

If the test fails I encode the captured video and save it. This works fine when I run the test locally.

But, when I run this on the build server the ScreenCaptureJob has a status of NotStarted.

No temp file is written to disc, so there is nothing to encode when the test fails.

        MediaItem mediaItem = new MediaItem(fileName);         Job job = new Job();         job.MediaItems.Add(mediaItem);         job.ApplyPreset(Presets.VC1HD720pVBR);         job.OutputDirectory = outputPath;         job.Encode(); 

Exception occurs when I try to create a new MediaItem from the temp file.

TestCleanup method UITests.FailingTest.TestCleanup threw exception. Microsoft.Expression.Encoder.InvalidMediaFileException: Microsoft.Expression.Encoder.InvalidMediaFileException: File not found. 

EE4 is installed on the build server, and I have tested capturing with the EE4 program itself.

Does anyone have an idea of why the ScreenCaptureJob fails to start on the server?

1 Answers

Answers 1

Running tests on Windows Server require you to add the feature

User Interfaces

and

Infrastructure > Desktop Experience

to install missing dependencies required by Microsoft Expression Encoder.

If you already did this and it doesn't work read this article, it is very helpful and there is a link to GitHub profile with the code used for the video recording. The author uses ScreenCaptureJob thru interface which sounds great.

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