[BDB-12] Fix double to string culture difference

Core/BuildingBlock.Core.Domain/Rules/Implementations/NumberMustBeGreaterThan.cs

@@ -1,4 +1,5 @@
 using BuildingBlock.Core.Domain.Rules.Abstractions;
+using BuildingBlock.Core.Domain.Shared.Utils;
 
 namespace BuildingBlock.Core.Domain.Rules.Implementations;
 
@@ -45,7 +46,8 @@ public bool IsBroken()
         var valueName = _valueName is not null ? $"{_valueName}: " : string.Empty;
         var compareValueName = _compareValueName is not null ? $"{_compareValueName}: " : string.Empty;
 
-        Message = $"{valueName}{_value} must be greater than {compareValueName}{_compareValue}.";
+        Message =
+            $"{valueName}{DoubleUtility.ToString(Convert.ToDouble(_value))} must be greater than {compareValueName}{DoubleUtility.ToString(Convert.ToDouble(_compareValue))}.";
 
         return true;
     }

Core/BuildingBlock.Core.Domain/Shared/Utils/DoubleUtility.cs

@@ -0,0 +1,13 @@
+using System.Globalization;
+
+namespace BuildingBlock.Core.Domain.Shared.Utils;
+
+public static class DoubleUtility
+{
+    public static string ToString(double value)
+    {
+        var valueString = value.ToString(CultureInfo.InvariantCulture);
+
+        return valueString.Replace('.', ',');
+    }
+}

Tests/BuildingBlock.Test.UnitTest/Core/Domain/Shared/Utils/DoubleUtilityTest.cs

@@ -0,0 +1,18 @@
+using BuildingBlock.Core.Domain.Shared.Utils;
+using FluentAssertions;
+
+namespace Tests.Core.Domain.Shared.Utils;
+
+public class DoubleUtilityTest
+{
+    public class ToString
+    {
+        [Fact]
+        public void ShouldConvertDoubleWithDot()
+        {
+            var actualData = DoubleUtility.ToString(1.1);
+
+            actualData.Should().Be("1,1");
+        }
+    }
+}