OSOE-668: "Creating the web driver failed" exception recently on GitHub-hosted Linux runners for Edge in Lombiq.UITestingToolbox

Lombiq.Tests.UI.Samples/Tests/BasicVisualVerificationTests.cs

@@ -54,7 +54,7 @@ public Task VerifyBlogImage(Browser browser) =>
     // is the different rendering of text on each platform, but it can occur between different Linux distributions too.
     // Here: https://pandasauce.org/post/linux-fonts/ you can find a good summary about this from 2019, but still valid
     // in 2022.
-    [Theory, Chrome]
+    [Theory, Chrome, Edge]
     public Task VerifyNavbar(Browser browser) =>
         ExecuteTestAfterSetupAsync(
             context =>

Lombiq.Tests.UI/Services/WebDriverFactory.cs

@@ -1,4 +1,5 @@
 using Atata.WebDriverSetup;
+using Lombiq.HelpfulLibraries.Cli.Helpers;
 using Lombiq.Tests.UI.Extensions;
 using OpenQA.Selenium;
 using OpenQA.Selenium.Chrome;
@@ -8,6 +9,8 @@
 using OpenQA.Selenium.IE;
 using System;
 using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices;
 
 namespace Lombiq.Tests.UI.Services;
 
@@ -64,6 +67,15 @@ public static EdgeDriver CreateEdgeDriver(BrowserConfiguration configuration, Ti
 
             options.SetCommonChromiumOptions(configuration);
 
+            // While the Edge driver easily locates Edge in Windows, it struggles in Linux, where the different release
+            // channels have different executable names. This setting looks up the "microsoft-edge-stable" command and
+            // sets the full path as the browser's binary location.
+            if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows) &&
+                CliWrapHelper.WhichAsync("microsoft-edge-stable").GetAwaiter().GetResult().FirstOrDefault() is { } binaryLocation)
+            {
+                options.BinaryLocation = binaryLocation.FullName;
+            }
+
             configuration.BrowserOptionsConfigurator?.Invoke(options);
 
             var service = EdgeDriverService.CreateDefaultService();