diff --git a/.vscode/settings.json b/.vscode/settings.json
index 76dd9a1..858341d 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -1,3 +1,4 @@
 {
-    "dotnet.defaultSolution": "Just.Railway.sln"
+    "dotnet.defaultSolution": "Just.Railway.sln",
+    "dotnetAcquisitionExtension.enableTelemetry": false
 }
\ No newline at end of file
diff --git a/LICENSE b/LICENSE
index 93713a2..0543fbb 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2023 JustFixMe
+Copyright (c) 2023-2024 JustFixMe
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/Railway.SourceGenerator/EnsureExtensionsExecutor.cs b/Railway.SourceGenerator/EnsureExtensionsExecutor.cs
index 4fbe65a..e1bd7ae 100644
--- a/Railway.SourceGenerator/EnsureExtensionsExecutor.cs
+++ b/Railway.SourceGenerator/EnsureExtensionsExecutor.cs
@@ -1,7 +1,4 @@
-using System;
 using System.Collections.Generic;
-using System.Collections.Immutable;
-using System.Linq;
 using System.Text;
 using Microsoft.CodeAnalysis;
 
@@ -45,6 +42,10 @@ public sealed class EnsureExtensionsExecutor : IGeneratorExecutor
         errorGenerationDefinitions.ForEach(def => GenerateSatisfiesExtensions(sb, def.ErrorParameterDecl, def.ErrorValueExpr));
         sb.AppendLine("#endregion");
 
+        sb.AppendLine("#region Null");
+        errorGenerationDefinitions.ForEach(def => GenerateNullExtensions(sb, def.ErrorParameterDecl, def.ErrorValueExpr));
+        sb.AppendLine("#endregion");
+
         sb.AppendLine("#region NotNull");
         errorGenerationDefinitions.ForEach(def => GenerateNotNullExtensions(sb, def.ErrorParameterDecl, def.ErrorValueExpr));
         sb.AppendLine("#endregion");
@@ -57,6 +58,34 @@ public sealed class EnsureExtensionsExecutor : IGeneratorExecutor
         errorGenerationDefinitions.ForEach(def => GenerateNotWhitespaceExtensions(sb, def.ErrorParameterDecl, def.ErrorValueExpr));
         sb.AppendLine("#endregion");
 
+        sb.AppendLine("#region True");
+        errorGenerationDefinitions.ForEach(def => GenerateTrueExtensions(sb, def.ErrorParameterDecl, def.ErrorValueExpr));
+        sb.AppendLine("#endregion");
+
+        sb.AppendLine("#region False");
+        errorGenerationDefinitions.ForEach(def => GenerateFalseExtensions(sb, def.ErrorParameterDecl, def.ErrorValueExpr));
+        sb.AppendLine("#endregion");
+
+        sb.AppendLine("#region EqualTo");
+        errorGenerationDefinitions.ForEach(def => GenerateEqualToExtensions(sb, def.ErrorParameterDecl, def.ErrorValueExpr));
+        sb.AppendLine("#endregion");
+
+        sb.AppendLine("#region LessThan");
+        errorGenerationDefinitions.ForEach(def => GenerateLessThanExtensions(sb, def.ErrorParameterDecl, def.ErrorValueExpr));
+        sb.AppendLine("#endregion");
+
+        sb.AppendLine("#region GreaterThan");
+        errorGenerationDefinitions.ForEach(def => GenerateGreaterThanExtensions(sb, def.ErrorParameterDecl, def.ErrorValueExpr));
+        sb.AppendLine("#endregion");
+
+        sb.AppendLine("#region LessThanOrEqualTo");
+        errorGenerationDefinitions.ForEach(def => GenerateLessThanOrEqualToExtensions(sb, def.ErrorParameterDecl, def.ErrorValueExpr));
+        sb.AppendLine("#endregion");
+
+        sb.AppendLine("#region GreaterThanOrEqualTo");
+        errorGenerationDefinitions.ForEach(def => GenerateGreaterThanOrEqualToExtensions(sb, def.ErrorParameterDecl, def.ErrorValueExpr));
+        sb.AppendLine("#endregion");
+
         return sb.ToString();
     }
 
@@ -119,6 +148,44 @@ public sealed class EnsureExtensionsExecutor : IGeneratorExecutor
         """));
     }
 
+    private void GenerateNullExtensions(StringBuilder sb, string errorParameterDecl, string errorValueExpr)
+    {
+        string defaultErrorExpr = "?? Error.New(DefaultErrorType, $\"Value {{{ensure.ValueExpression}}} is not null.\")";
+
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(EnsureExtensionsExecutor)}}", "1.0.0.0")]
+        public static Ensure<T?> Null<T>(this in Ensure<T?> ensure, {{errorParameterDecl}})
+            where T : struct
+        {
+            return ensure.State switch
+            {
+                ResultState.Success => !ensure.Value.HasValue
+                    ? new(default(T?)!, ensure.ValueExpression)
+                    : new({{errorValueExpr}} {{defaultErrorExpr}}, ensure.ValueExpression),
+                ResultState.Error => new(ensure.Error!, ensure.ValueExpression),
+                _ => throw new EnsureNotInitializedException(nameof(ensure))
+            };
+        }
+        """);
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(EnsureExtensionsExecutor)}}", "1.0.0.0")]
+        public static Ensure<T?> Null<T>(this in Ensure<T?> ensure, {{errorParameterDecl}})
+            where T : class
+        {
+            return ensure.State switch
+            {
+                ResultState.Success => ensure.Value is null
+                    ? new(default(T?)!, ensure.ValueExpression)
+                    : new({{errorValueExpr}} {{defaultErrorExpr}}, ensure.ValueExpression),
+                ResultState.Error => new(ensure.Error!, ensure.ValueExpression),
+                _ => throw new EnsureNotInitializedException(nameof(ensure))
+            };
+        }
+        """);
+    }
+
     private void GenerateNotNullExtensions(StringBuilder sb, string errorParameterDecl, string errorValueExpr)
     {
         string defaultErrorExpr = "?? Error.New(DefaultErrorType, $\"Value {{{ensure.ValueExpression}}} is null.\")";
@@ -230,4 +297,183 @@ public sealed class EnsureExtensionsExecutor : IGeneratorExecutor
         }
         """);
     }
+
+    private void GenerateTrueExtensions(StringBuilder sb, string errorParameterDecl, string errorValueExpr)
+    {
+        string defaultErrorExpr = "?? Error.New(DefaultErrorType, $\"Value {{{ensure.ValueExpression}}} is not true.\")";
+
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(EnsureExtensionsExecutor)}}", "1.0.0.0")]
+        public static Ensure<bool> True(this in Ensure<bool> ensure, {{errorParameterDecl}})
+        {
+            return ensure.State switch
+            {
+                ResultState.Success => ensure.Value == true
+                    ? new(ensure.Value!, ensure.ValueExpression)
+                    : new({{errorValueExpr}} {{defaultErrorExpr}}, ensure.ValueExpression),
+                ResultState.Error => new(ensure.Error!, ensure.ValueExpression),
+                _ => throw new EnsureNotInitializedException(nameof(ensure))
+            };
+        }
+        """);
+
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(EnsureExtensionsExecutor)}}", "1.0.0.0")]
+        public static Ensure<bool> True(this in Ensure<bool?> ensure, {{errorParameterDecl}})
+        {
+            return ensure.State switch
+            {
+                ResultState.Success => ensure.Value == true
+                    ? new(ensure.Value.Value, ensure.ValueExpression)
+                    : new({{errorValueExpr}} {{defaultErrorExpr}}, ensure.ValueExpression),
+                ResultState.Error => new(ensure.Error!, ensure.ValueExpression),
+                _ => throw new EnsureNotInitializedException(nameof(ensure))
+            };
+        }
+        """);
+    }
+
+    private void GenerateFalseExtensions(StringBuilder sb, string errorParameterDecl, string errorValueExpr)
+    {
+        string defaultErrorExpr = "?? Error.New(DefaultErrorType, $\"Value {{{ensure.ValueExpression}}} is not false.\")";
+
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(EnsureExtensionsExecutor)}}", "1.0.0.0")]
+        public static Ensure<bool> False(this in Ensure<bool> ensure, {{errorParameterDecl}})
+        {
+            return ensure.State switch
+            {
+                ResultState.Success => ensure.Value == false
+                    ? new(ensure.Value!, ensure.ValueExpression)
+                    : new({{errorValueExpr}} {{defaultErrorExpr}}, ensure.ValueExpression),
+                ResultState.Error => new(ensure.Error!, ensure.ValueExpression),
+                _ => throw new EnsureNotInitializedException(nameof(ensure))
+            };
+        }
+        """);
+
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(EnsureExtensionsExecutor)}}", "1.0.0.0")]
+        public static Ensure<bool> False(this in Ensure<bool?> ensure, {{errorParameterDecl}})
+        {
+            return ensure.State switch
+            {
+                ResultState.Success => ensure.Value == false
+                    ? new(ensure.Value.Value, ensure.ValueExpression)
+                    : new({{errorValueExpr}} {{defaultErrorExpr}}, ensure.ValueExpression),
+                ResultState.Error => new(ensure.Error!, ensure.ValueExpression),
+                _ => throw new EnsureNotInitializedException(nameof(ensure))
+            };
+        }
+        """);
+    }
+
+    private void GenerateEqualToExtensions(StringBuilder sb, string errorParameterDecl, string errorValueExpr)
+    {
+        string defaultErrorExpr = "?? Error.New(DefaultErrorType, $\"Value {{{ensure.ValueExpression}}} is not equal to requirement.\")";
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(EnsureExtensionsExecutor)}}", "1.0.0.0")]
+        public static Ensure<T> EqualTo<T>(this in Ensure<T> ensure, T requirement, {{errorParameterDecl}})
+            where T : IEquatable<T>
+        {
+            return ensure.State switch
+            {
+                ResultState.Success => ensure.Value.Equals(requirement)
+                    ? new(ensure.Value, ensure.ValueExpression)
+                    : new({{errorValueExpr}} {{defaultErrorExpr}}, ensure.ValueExpression),
+                ResultState.Error => new(ensure.Error!, ensure.ValueExpression),
+                _ => throw new EnsureNotInitializedException(nameof(ensure))
+            };
+        }
+        """);
+    }
+
+    private void GenerateLessThanExtensions(StringBuilder sb, string errorParameterDecl, string errorValueExpr)
+    {
+        string defaultErrorExpr = "?? Error.New(DefaultErrorType, $\"Value {{{ensure.ValueExpression}}} is not less than requirement.\")";
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(EnsureExtensionsExecutor)}}", "1.0.0.0")]
+        public static Ensure<T> LessThan<T>(this in Ensure<T> ensure, T requirement, {{errorParameterDecl}})
+            where T : IComparable<T>
+        {
+            return ensure.State switch
+            {
+                ResultState.Success => ensure.Value.CompareTo(requirement) < 0
+                    ? new(ensure.Value, ensure.ValueExpression)
+                    : new({{errorValueExpr}} {{defaultErrorExpr}}, ensure.ValueExpression),
+                ResultState.Error => new(ensure.Error!, ensure.ValueExpression),
+                _ => throw new EnsureNotInitializedException(nameof(ensure))
+            };
+        }
+        """);
+    }
+
+    private void GenerateGreaterThanExtensions(StringBuilder sb, string errorParameterDecl, string errorValueExpr)
+    {
+        string defaultErrorExpr = "?? Error.New(DefaultErrorType, $\"Value {{{ensure.ValueExpression}}} is not greater than requirement.\")";
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(EnsureExtensionsExecutor)}}", "1.0.0.0")]
+        public static Ensure<T> GreaterThan<T>(this in Ensure<T> ensure, T requirement, {{errorParameterDecl}})
+            where T : IComparable<T>
+        {
+            return ensure.State switch
+            {
+                ResultState.Success => ensure.Value.CompareTo(requirement) > 0
+                    ? new(ensure.Value, ensure.ValueExpression)
+                    : new({{errorValueExpr}} {{defaultErrorExpr}}, ensure.ValueExpression),
+                ResultState.Error => new(ensure.Error!, ensure.ValueExpression),
+                _ => throw new EnsureNotInitializedException(nameof(ensure))
+            };
+        }
+        """);
+    }
+
+    private void GenerateLessThanOrEqualToExtensions(StringBuilder sb, string errorParameterDecl, string errorValueExpr)
+    {
+        string defaultErrorExpr = "?? Error.New(DefaultErrorType, $\"Value {{{ensure.ValueExpression}}} is greater than requirement.\")";
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(EnsureExtensionsExecutor)}}", "1.0.0.0")]
+        public static Ensure<T> LessThanOrEqualTo<T>(this in Ensure<T> ensure, T requirement, {{errorParameterDecl}})
+            where T : IComparable<T>
+        {
+            return ensure.State switch
+            {
+                ResultState.Success => ensure.Value.CompareTo(requirement) <= 0
+                    ? new(ensure.Value, ensure.ValueExpression)
+                    : new({{errorValueExpr}} {{defaultErrorExpr}}, ensure.ValueExpression),
+                ResultState.Error => new(ensure.Error!, ensure.ValueExpression),
+                _ => throw new EnsureNotInitializedException(nameof(ensure))
+            };
+        }
+        """);
+    }
+
+    private void GenerateGreaterThanOrEqualToExtensions(StringBuilder sb, string errorParameterDecl, string errorValueExpr)
+    {
+        string defaultErrorExpr = "?? Error.New(DefaultErrorType, $\"Value {{{ensure.ValueExpression}}} is less than requirement.\")";
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(EnsureExtensionsExecutor)}}", "1.0.0.0")]
+        public static Ensure<T> GreaterThanOrEqualTo<T>(this in Ensure<T> ensure, T requirement, {{errorParameterDecl}})
+            where T : IComparable<T>
+        {
+            return ensure.State switch
+            {
+                ResultState.Success => ensure.Value.CompareTo(requirement) >= 0
+                    ? new(ensure.Value, ensure.ValueExpression)
+                    : new({{errorValueExpr}} {{defaultErrorExpr}}, ensure.ValueExpression),
+                ResultState.Error => new(ensure.Error!, ensure.ValueExpression),
+                _ => throw new EnsureNotInitializedException(nameof(ensure))
+            };
+        }
+        """);
+    }
 }
diff --git a/Railway.SourceGenerator/ExtensionsMethodGenerator.cs b/Railway.SourceGenerator/ExtensionsMethodGenerator.cs
index f626b06..b7298be 100644
--- a/Railway.SourceGenerator/ExtensionsMethodGenerator.cs
+++ b/Railway.SourceGenerator/ExtensionsMethodGenerator.cs
@@ -1,8 +1,4 @@
-using System;
 using System.Collections.Generic;
-using System.Collections.Immutable;
-using System.Linq;
-using System.Text;
 using Microsoft.CodeAnalysis;
 
 namespace Just.Railway.SourceGen;
diff --git a/Railway.SourceGenerator/IGeneratorExecutor.cs b/Railway.SourceGenerator/IGeneratorExecutor.cs
index f4c5e89..e42d884 100644
--- a/Railway.SourceGenerator/IGeneratorExecutor.cs
+++ b/Railway.SourceGenerator/IGeneratorExecutor.cs
@@ -1,4 +1,3 @@
-using System;
 using Microsoft.CodeAnalysis;
 
 namespace Just.Railway.SourceGen;
diff --git a/Railway.SourceGenerator/ResultAppendExecutor.cs b/Railway.SourceGenerator/ResultAppendExecutor.cs
index 73a294b..f0364cc 100644
--- a/Railway.SourceGenerator/ResultAppendExecutor.cs
+++ b/Railway.SourceGenerator/ResultAppendExecutor.cs
@@ -1,9 +1,7 @@
-using System;
 using System.Collections.Immutable;
 using System.Linq;
 using System.Text;
 using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.CSharp.Syntax;
 
 namespace Just.Railway.SourceGen;
 
diff --git a/Railway.SourceGenerator/ResultMatchExecutor.cs b/Railway.SourceGenerator/ResultMatchExecutor.cs
index 9376454..2bfb33c 100644
--- a/Railway.SourceGenerator/ResultMatchExecutor.cs
+++ b/Railway.SourceGenerator/ResultMatchExecutor.cs
@@ -1,5 +1,3 @@
-using System;
-using System.Collections.Generic;
 using System.Collections.Immutable;
 using System.Linq;
 using System.Text;
diff --git a/Railway.SourceGenerator/ResultTryRecoverExecutor.cs b/Railway.SourceGenerator/ResultTryRecoverExecutor.cs
index 2c68676..ebcf11a 100644
--- a/Railway.SourceGenerator/ResultTryRecoverExecutor.cs
+++ b/Railway.SourceGenerator/ResultTryRecoverExecutor.cs
@@ -1,7 +1,6 @@
 using System.Collections.Immutable;
 using System.Linq;
 using System.Text;
-using Microsoft.CodeAnalysis;
 
 namespace Just.Railway.SourceGen;
 
diff --git a/Railway.SourceGenerator/TryExtensionsExecutor.cs b/Railway.SourceGenerator/TryExtensionsExecutor.cs
index 30ff82e..0d74b2e 100644
--- a/Railway.SourceGenerator/TryExtensionsExecutor.cs
+++ b/Railway.SourceGenerator/TryExtensionsExecutor.cs
@@ -1,4 +1,3 @@
-using System;
 using System.Collections.Immutable;
 using System.Linq;
 using System.Text;
diff --git a/Railway/Ensure.cs b/Railway/Ensure.cs
index 5c725b8..6110367 100644
--- a/Railway/Ensure.cs
+++ b/Railway/Ensure.cs
@@ -8,32 +8,9 @@ public static partial class Ensure
 
     [Pure] public static Ensure<T> That<T>(T value, [CallerArgumentExpression(nameof(value))]string valueExpression = "") => new(value, valueExpression);
 
-    [Pure] public static Result<T> Result<T>(this in Ensure<T> ensure) => ensure.State switch
-    {
-        ResultState.Success => new(ensure.Value),
-        ResultState.Error => new(ensure.Error!),
-        _ => throw new EnsureNotInitializedException(nameof(ensure))
-    };
-    [Pure] public static async Task<Result<T>> Result<T>(this Task<Ensure<T>> ensureTask)
-    {
-        var ensure = await ensureTask.ConfigureAwait(false);
-        return ensure.State switch
-        {
-            ResultState.Success => new(ensure.Value),
-            ResultState.Error => new(ensure.Error!),
-            _ => throw new EnsureNotInitializedException(nameof(ensureTask))
-        };
-    }
-    [Pure] public static async ValueTask<Result<T>> Result<T>(this ValueTask<Ensure<T>> ensureTask)
-    {
-        var ensure = await ensureTask.ConfigureAwait(false);
-        return ensure.State switch
-        {
-            ResultState.Success => new(ensure.Value),
-            ResultState.Error => new(ensure.Error!),
-            _ => throw new EnsureNotInitializedException(nameof(ensureTask))
-        };
-    }
+    [Pure] public static Result<T> Result<T>(this in Ensure<T> ensure) => ensure;
+    [Pure] public static async Task<Result<T>> Result<T>(this Task<Ensure<T>> ensureTask) => await ensureTask.ConfigureAwait(false);
+    [Pure] public static async ValueTask<Result<T>> Result<T>(this ValueTask<Ensure<T>> ensureTask) => await ensureTask.ConfigureAwait(false);
 }
 
 public readonly struct Ensure<T>
@@ -58,6 +35,22 @@ public readonly struct Ensure<T>
         Value = default!;
         State = ResultState.Error;
     }
+
+    [Pure]
+    public static implicit operator Result<T>(in Ensure<T> ensure) => ensure.State switch
+    {
+        ResultState.Success => new(ensure.Value),
+        ResultState.Error => new(ensure.Error!),
+        _ => throw new EnsureNotInitializedException(nameof(ensure))
+    };
+
+    [Pure]
+    public static explicit operator Result(in Ensure<T> ensure) => ensure.State switch
+    {
+        ResultState.Success => new(null),
+        ResultState.Error => new(ensure.Error!),
+        _ => throw new EnsureNotInitializedException(nameof(ensure))
+    };
 }
 
 [Serializable]
diff --git a/Railway/ErrorJsonConverter.cs b/Railway/ErrorJsonConverter.cs
index 76b3271..b6d8b27 100644
--- a/Railway/ErrorJsonConverter.cs
+++ b/Railway/ErrorJsonConverter.cs
@@ -49,7 +49,7 @@ public sealed class ErrorJsonConverter : JsonConverter<Error>
         => new(errorInfo.Type, errorInfo.Message) { ExtensionData = errorInfo.ExtensionData };
     internal static (string Type, string Message, ImmutableDictionary<string, string> ExtensionData) ReadOne(ref Utf8JsonReader reader)
     {
-        List<KeyValuePair<string, string>>? extensionData = null;
+        ImmutableDictionary<string, string>.Builder? extensionData = null;
         string type = "error";
         string message = "";
         while (reader.Read())
@@ -83,8 +83,8 @@ public sealed class ErrorJsonConverter : JsonConverter<Error>
                     }
                     else if (!string.IsNullOrEmpty(propname))
                     {
-                        extensionData ??= new(4);
-                        extensionData.Add(new(propname, propvalue));
+                        extensionData ??= ImmutableDictionary.CreateBuilder<string, string>();
+                        extensionData.Add(propname, propvalue);
                     }
 
                     break;
@@ -95,7 +95,7 @@ public sealed class ErrorJsonConverter : JsonConverter<Error>
             }
         }
         endLoop:
-        return (type, message, extensionData?.ToImmutableDictionary() ?? ImmutableDictionary<string, string>.Empty);
+        return (type, message, extensionData?.ToImmutable() ?? ImmutableDictionary<string, string>.Empty);
     }
     internal static void WriteOne(Utf8JsonWriter writer, Error value)
     {
diff --git a/Railway/Railway.csproj b/Railway/Railway.csproj
index 5692e96..a4767e1 100644
--- a/Railway/Railway.csproj
+++ b/Railway/Railway.csproj
@@ -11,7 +11,7 @@
     <Description>Base for railway-oriented programming in .NET. Package includes Result object, Error class and most of the common extensions.</Description>
     <PackageTags>railway-oriented;functional;result-pattern;result-object;error-handling</PackageTags>
     <Authors>JustFixMe</Authors>
-    <Copyright>Copyright (c) 2023 JustFixMe</Copyright>
+    <Copyright>Copyright (c) 2023-2024 JustFixMe</Copyright>
     <PackageLicenseFile>LICENSE</PackageLicenseFile>
     <PackageReadmeFile>README.md</PackageReadmeFile>
     <RepositoryUrl>https://github.com/JustFixMe/Just.Railway/</RepositoryUrl>
diff --git a/Railway/ReflectionHelper.cs b/Railway/ReflectionHelper.cs
index e269e09..1db6ef0 100644
--- a/Railway/ReflectionHelper.cs
+++ b/Railway/ReflectionHelper.cs
@@ -1,5 +1,4 @@
 using System.Reflection;
-using System.Runtime.CompilerServices;
 
 namespace Just.Railway;
 
diff --git a/Railway/Result.cs b/Railway/Result.cs
index 7dbcb4e..16d32fb 100644
--- a/Railway/Result.cs
+++ b/Railway/Result.cs
@@ -1,4 +1,3 @@
-
 namespace Just.Railway;
 
 internal enum ResultState : byte
diff --git a/Raliway.Tests/EnsureExtensions/Satisfy.cs b/Raliway.Tests/EnsureExtensions/Satisfy.cs
index 588f2af..4c84a1d 100644
--- a/Raliway.Tests/EnsureExtensions/Satisfy.cs
+++ b/Raliway.Tests/EnsureExtensions/Satisfy.cs
@@ -7,8 +7,9 @@ public class Satisfy
     {
         var result = Ensure.That(69)
             .Satisfies(i => i < 100)
+            .LessThan(100)
             .Result();
-        
+
         Assert.True(result.IsSuccess);
         Assert.Equal(69, result.Value);
     }
@@ -18,8 +19,9 @@ public class Satisfy
         var error = Error.New(Ensure.DefaultErrorType, "Value {69} does not satisfy the requirement.");
         var result = Ensure.That(69)
             .Satisfies(i => i > 100)
+            .GreaterThan(100)
             .Result();
-        
+
         Assert.True(result.IsFailure);
         Assert.Equal(error, result.Error);
     }
@@ -32,8 +34,9 @@ public class Satisfy
             .NotEmpty()
             .NotWhitespace()
             .Satisfies(s => s == "69")
+            .EqualTo("69")
             .Result();
-        
+
         Assert.True(result.IsSuccess);
         Assert.Equal("69", result.Value);
     }
@@ -47,8 +50,9 @@ public class Satisfy
             .NotEmpty()
             .NotWhitespace()
             .Satisfies(s => s == "69")
+            .EqualTo("69")
             .Result();
-        
+
         Assert.True(result.IsFailure);
         Assert.Equal(error, result.Error);
     }