diff --git a/src/Domain/HydraScript.Domain.BackEnd/Impl/Instructions/WithAssignment/Simple.cs b/src/Domain/HydraScript.Domain.BackEnd/Impl/Instructions/WithAssignment/Simple.cs
index b85c3ef0..e613c535 100644
--- a/src/Domain/HydraScript.Domain.BackEnd/Impl/Instructions/WithAssignment/Simple.cs
+++ b/src/Domain/HydraScript.Domain.BackEnd/Impl/Instructions/WithAssignment/Simple.cs
@@ -73,8 +73,8 @@ protected virtual void Assign()
         {
             "-" => -Convert.ToDouble(value),
             "!" => !Convert.ToBoolean(value),
-            "~" when value is List<object> list => list.Count,
-            "~" when value is string @string => @string.Length,
+            "~" when value is List<object> list => Convert.ToDouble(list.Count),
+            "~" when value is string @string => Convert.ToDouble(@string.Length),
             "" => value,
             _ => throw new NotSupportedException($"_operator {_operator} is not supported")
         };
diff --git a/tests/HydraScript.IntegrationTests/SuccessPrograms/ArithmeticTests.cs b/tests/HydraScript.IntegrationTests/SuccessPrograms/ArithmeticTests.cs
new file mode 100644
index 00000000..f9889839
--- /dev/null
+++ b/tests/HydraScript.IntegrationTests/SuccessPrograms/ArithmeticTests.cs
@@ -0,0 +1,32 @@
+using HydraScript.Infrastructure;
+
+namespace HydraScript.IntegrationTests.SuccessPrograms;
+
+public class ArithmeticTests(TestHostFixture fixture) : IClassFixture<TestHostFixture>
+{
+    /// <summary>
+    /// https://github.com/Stepami/hydrascript/issues/232
+    /// </summary>
+    [Fact]
+    public void Equality_AdditionToTheLeft_Success()
+    {
+        const string script =
+            """
+            let i = 0
+            const s = "abcdef"
+            const sLen = ~s
+            while (i < sLen) {
+                if (i + 1 == sLen)
+                    >>> "i is 5"
+                i = i + 1
+            }
+            """;
+        using var runner = fixture.GetRunner(
+            new TestHostFixture.Options(
+                InMemoryScript: script));
+        var code = runner.Invoke();
+        code.Should().Be(Executor.ExitCodes.Success);
+        fixture.LogMessages.Should()
+            .Contain(log => log.Contains("i is 5"));
+    }
+}
\ No newline at end of file
diff --git a/tests/HydraScript.IntegrationTests/DumpOptionTests.cs b/tests/HydraScript.IntegrationTests/SuccessPrograms/DumpOptionTests.cs
similarity index 96%
rename from tests/HydraScript.IntegrationTests/DumpOptionTests.cs
rename to tests/HydraScript.IntegrationTests/SuccessPrograms/DumpOptionTests.cs
index 29bee0be..7102853d 100644
--- a/tests/HydraScript.IntegrationTests/DumpOptionTests.cs
+++ b/tests/HydraScript.IntegrationTests/SuccessPrograms/DumpOptionTests.cs
@@ -3,7 +3,7 @@
 using Microsoft.Extensions.DependencyInjection;
 using NSubstitute;
 
-namespace HydraScript.IntegrationTests;
+namespace HydraScript.IntegrationTests.SuccessPrograms;
 
 public class DumpOptionTests(TestHostFixture fixture) : IClassFixture<TestHostFixture>
 {
diff --git a/tests/HydraScript.IntegrationTests/InputTests.cs b/tests/HydraScript.IntegrationTests/SuccessPrograms/InputTests.cs
similarity index 94%
rename from tests/HydraScript.IntegrationTests/InputTests.cs
rename to tests/HydraScript.IntegrationTests/SuccessPrograms/InputTests.cs
index 5722ab83..10b82031 100644
--- a/tests/HydraScript.IntegrationTests/InputTests.cs
+++ b/tests/HydraScript.IntegrationTests/SuccessPrograms/InputTests.cs
@@ -3,7 +3,7 @@
 using Microsoft.Extensions.DependencyInjection.Extensions;
 using NSubstitute;
 
-namespace HydraScript.IntegrationTests;
+namespace HydraScript.IntegrationTests.SuccessPrograms;
 
 public class InputTests(TestHostFixture fixture) : IClassFixture<TestHostFixture>
 {
diff --git a/tests/HydraScript.IntegrationTests/SuccessfulProgramsTests.cs b/tests/HydraScript.IntegrationTests/SuccessPrograms/SuccessfulProgramsTests.cs
similarity index 93%
rename from tests/HydraScript.IntegrationTests/SuccessfulProgramsTests.cs
rename to tests/HydraScript.IntegrationTests/SuccessPrograms/SuccessfulProgramsTests.cs
index ffd0df6d..9cf78807 100644
--- a/tests/HydraScript.IntegrationTests/SuccessfulProgramsTests.cs
+++ b/tests/HydraScript.IntegrationTests/SuccessPrograms/SuccessfulProgramsTests.cs
@@ -1,6 +1,6 @@
 using HydraScript.Infrastructure;
 
-namespace HydraScript.IntegrationTests;
+namespace HydraScript.IntegrationTests.SuccessPrograms;
 
 public class SuccessfulProgramsTests(TestHostFixture fixture) : IClassFixture<TestHostFixture>
 {