diff --git a/csharp/Platform.Numbers.Tests/CalcResultTests.cs b/csharp/Platform.Numbers.Tests/CalcResultTests.cs
new file mode 100644
index 0000000..f120c40
--- /dev/null
+++ b/csharp/Platform.Numbers.Tests/CalcResultTests.cs
@@ -0,0 +1,18 @@
+using Xunit;
+
+namespace Platform.Numbers.Tests
+{
+    public static class CalcResultTests
+    {
+        [Fact]
+        public static void UsingOperatorsTests()
+        {
+            //act
+            var result = ((CalcResult<int>)5 + 6) * (3 + 9 / 3);
+
+            //assert
+            int expected = (5 + 6) * (3 + 9 / 3);
+            Assert.Equal(expected, result.Value);
+        }
+    }
+}