in TeamCity.ServiceMessages/Write/Special/Impl/Writer/TeamCityTestWriter.cs [46:51]
public void WriteFailed(string errorMessage, string errorDetails)
{
if (errorMessage == null) throw new ArgumentNullException(nameof(errorMessage));
if (errorDetails == null) throw new ArgumentNullException(nameof(errorDetails));
PostMessage(new ServiceMessage("testFailed") {{"name", _testName}, {"message", errorMessage}, {"details", errorDetails}});
}