System.Diagnostics.Process has a different behavior on non-Windows platforms

BuildForPublication.cmd

@@ -5,7 +5,7 @@
 setlocal EnableDelayedExpansion
   set errorlevel=
   set BuildConfiguration=Release
-  set VersionSuffix=beta-build0012
+  set VersionSuffix=beta-build0013
 
   REM Check that git is on path.
   where.exe /Q git.exe || (

src/xunit.performance.api/ProcessExitInfo.cs

@@ -11,18 +11,22 @@ public sealed class ProcessExitInfo
         /// <summary>
         /// Initializes a new instance of a ProcessExitInfo class with the run process.
         /// </summary>
-        /// <param name="process"></param>
-        public ProcessExitInfo(Process process)
+        /// <param name="process">The terminated process.</param>
+        /// <param name="startTime">The time that the associated process was started.</param>
+        /// <param name="exitTime">The time that the associated process exited.</param>
+        internal ProcessExitInfo(Process process, DateTime startTime, DateTime exitTime)
         {
             if (process == null)
                 throw new ArgumentNullException(nameof(process));
             if (!process.HasExited)
                 throw new InvalidOperationException($"{process.ProcessName} has not exited.");
+            if (exitTime < startTime)
+                throw new InvalidOperationException($"Process.ExitTime: {exitTime}, is less than the Process.StartTime: {startTime}.");
 
             ProcessId = process.Id;
             ExitCode = process.ExitCode;
-            StartTime = process.StartTime;
-            ExitTime = process.ExitTime;
+            StartTime = startTime;
+            ExitTime = exitTime;
         }
 
         /// <summary>

src/xunit.performance.api/ScenarioExecutionResult.cs

@@ -2,8 +2,8 @@
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 
 using Microsoft.Xunit.Performance.Api.Profilers.Etw;
+using System;
 using System.Collections.Generic;
-using System.Diagnostics;
 
 namespace Microsoft.Xunit.Performance.Api
 {
@@ -16,10 +16,12 @@ public sealed class ScenarioExecutionResult
         /// Initializes a new instance of the ScenarioExecutionResult class.
         /// </summary>
         /// <param name="process">Scenario benchmark process that was run.</param>
+        /// <param name="startTime">The time that the associated process was started.</param>
+        /// <param name="exitTime">The time that the associated process exited.</param>
         /// <param name="configuration">Configuration for the scenario that was run.</param>
-        public ScenarioExecutionResult(System.Diagnostics.Process process, ScenarioTestConfiguration configuration)
+        internal ScenarioExecutionResult(System.Diagnostics.Process process, DateTime startTime, DateTime exitTime, ScenarioTestConfiguration configuration)
         {
-            ProcessExitInfo = new ProcessExitInfo(process);
+            ProcessExitInfo = new ProcessExitInfo(process, startTime, exitTime);
             Configuration = configuration;
         }
 

src/xunit.performance.api/XunitPerformanceHarness.cs

@@ -293,7 +293,9 @@ public static string Usage()
 
         private static ScenarioExecutionResult Run(ScenarioTestConfiguration configuration, ScenarioTest scenarioTest)
         {
-            if (!scenarioTest.Process.Start())
+            var hasStarted = scenarioTest.Process.Start();
+            var startTime = DateTime.UtcNow;
+            if (!hasStarted)
                 throw new Exception($"Failed to start {scenarioTest.Process.ProcessName}");
 
             if (scenarioTest.Process.StartInfo.RedirectStandardError)
@@ -303,7 +305,11 @@ private static ScenarioExecutionResult Run(ScenarioTestConfiguration configurati
             if (scenarioTest.Process.StartInfo.RedirectStandardOutput)
                 scenarioTest.Process.BeginOutputReadLine();
 
-            if (scenarioTest.Process.WaitForExit((int)(configuration.TimeoutPerIteration.TotalMilliseconds)) == false)
+            var hasExited = scenarioTest.Process.WaitForExit(
+                (int)(configuration.TimeoutPerIteration.TotalMilliseconds));
+            var exitTime = DateTime.UtcNow;
+
+            if (!hasExited)
             {
                 // TODO: scenarioOutput.Process.Kill[All|Tree]();
                 scenarioTest.Process.Kill();
@@ -314,7 +320,7 @@ private static ScenarioExecutionResult Run(ScenarioTestConfiguration configurati
             if (!configuration.SuccessExitCodes.Contains(scenarioTest.Process.ExitCode))
                 throw new Exception($"'{scenarioTest.Process.StartInfo.FileName}' exited with an invalid exit code: {scenarioTest.Process.ExitCode}");
 
-            return new ScenarioExecutionResult(scenarioTest.Process, configuration);
+            return new ScenarioExecutionResult(scenarioTest.Process, startTime, exitTime, configuration);
         }
 
         private void ProcessResults(XUnitPerformanceSessionData xUnitSessionData, XUnitPerformanceMetricData xUnitPerformanceMetricData)