Resolve the failing test (#6622)

test/Core.Test/Billing/Extensions/InvoiceExtensionsTests.cs

@@ -1,4 +1,5 @@
-using Bit.Core.Billing.Extensions;
+using System.Globalization;
+using Bit.Core.Billing.Extensions;
 using Stripe;
 using Xunit;
 
@@ -356,6 +357,15 @@ public class InvoiceExtensionsTests
     [Fact]
     public void FormatForProvider_ComplexScenario_HandlesAllLineTypes()
     {
+        // Set culture to en-US to ensure consistent decimal formatting in tests
+        // This ensures tests pass on all machines regardless of system locale
+        var originalCulture = Thread.CurrentThread.CurrentCulture;
+        var originalUICulture = Thread.CurrentThread.CurrentUICulture;
+        try
+        {
+            Thread.CurrentThread.CurrentCulture = new CultureInfo("en-US");
+            Thread.CurrentThread.CurrentUICulture = new CultureInfo("en-US");
+
             // Arrange
             var lineItems = new StripeList<InvoiceLineItem>();
             lineItems.Data = new List<InvoiceLineItem>
@@ -390,6 +400,12 @@ public class InvoiceExtensionsTests
             Assert.Equal("Custom Service", result[3]);
             Assert.Equal("1 × Tax (at $2.00 / month)", result[4]);
         }
+        finally
+        {
+            Thread.CurrentThread.CurrentCulture = originalCulture;
+            Thread.CurrentThread.CurrentUICulture = originalUICulture;
+        }
+    }
 
     #endregion
 }