Prevent "Sequence contains no elements" in browser tests (#1261)

Capture the collection between the check of elements and LINQ action on it.
dotnet · Sep 6, 2024 · 8e7ee2e · 8e7ee2e
1 parent ab05656
commit 8e7ee2e
Showing 1 changed file with 7 additions and 1 deletion.
diff --git a/src/Microsoft.DotNet.XHarness.CLI/Commands/WASM/Browser/WasmTestBrowserCommand.cs b/src/Microsoft.DotNet.XHarness.CLI/Commands/WASM/Browser/WasmTestBrowserCommand.cs
@@ -120,7 +120,13 @@ protected override async Task<ExitCode> InvokeInternal(ILogger logger)
                     driver.Navigate().GoToUrl("about:config");
                     driver.Navigate().GoToUrl("about:blank");
                     driver.Close(); //Close Tab
-                    driver.SwitchTo().Window(driver.WindowHandles.Last());
+
+                    // this is not redundant, it prevents "System.InvalidOperationException: Sequence contains no elements"
+                    var windowHandles = driver.WindowHandles.ToList();
+                    if (windowHandles.Any())
+                    {
+                        driver.SwitchTo().Window(windowHandles.Last());
+                    }
                 }
                 if (driverService.IsRunning)
                 {