diff --git a/src/MyTested.AspNetCore.Mvc.ModelState/Builders/Contracts/Models/IModelStateBuilder.cs b/src/MyTested.AspNetCore.Mvc.ModelState/Builders/Contracts/Models/IModelStateBuilder.cs
index 9a8fcd9e2..2517d8eea 100644
--- a/src/MyTested.AspNetCore.Mvc.ModelState/Builders/Contracts/Models/IModelStateBuilder.cs
+++ b/src/MyTested.AspNetCore.Mvc.ModelState/Builders/Contracts/Models/IModelStateBuilder.cs
@@ -1,5 +1,6 @@
 namespace MyTested.AspNetCore.Mvc.Builders.Contracts.Models
 {
+    using System;
     using System.Collections.Generic;
 
     /// <summary>
@@ -28,5 +29,19 @@ public interface IModelStateBuilder
         /// <param name="errors">Model state entries as anonymous object.</param>
         /// <returns></returns>
         IAndModelStateBuilder WithErrors(object errors);
+
+        /// <summary>
+        /// Tests whether the model state entry passes the given assertions.
+        /// </summary>
+        /// <param name="assertions">Action containing all assertions for the model state entry.</param>
+        /// <returns>The same <see cref="IAndModelStateBuilder"/>.</returns>
+        IAndModelStateBuilder Passing(Action assertions);
+
+        /// <summary>
+        /// Tests whether the data provider entry passes the given predicate.
+        /// </summary>
+        /// <param name="predicate">Predicate testing the data provider entry.</param>
+        /// <returns>The same <see cref="IAndModelStateBuilder"/>.</returns>
+        IAndModelStateBuilder Passing(Func<bool> predicate);
     }
 }
diff --git a/src/MyTested.AspNetCore.Mvc.ModelState/Builders/Models/ModelStateBuilder.cs b/src/MyTested.AspNetCore.Mvc.ModelState/Builders/Models/ModelStateBuilder.cs
index 8b361ecd4..117baadea 100644
--- a/src/MyTested.AspNetCore.Mvc.ModelState/Builders/Models/ModelStateBuilder.cs
+++ b/src/MyTested.AspNetCore.Mvc.ModelState/Builders/Models/ModelStateBuilder.cs
@@ -6,6 +6,7 @@
     using Contracts.Models;
     using Internal.TestContexts;
     using Utilities.Extensions;
+    using System;
 
     /// <summary>
     /// Used for building <see cref="ModelStateDictionary"/>
@@ -54,5 +55,17 @@ public IAndModelStateBuilder WithErrors(object errors)
 
         private void AddError(string key, string errorMessage) 
             => this.ModelState.AddModelError(key, errorMessage);
+
+        /// <inheritdoc />
+        public IAndModelStateBuilder Passing(Action assertions)
+        {
+            throw new NotImplementedException();
+        }
+
+        /// <inheritdoc />
+        public IAndModelStateBuilder Passing(Func<bool> predicate)
+        {
+            throw new NotImplementedException();
+        }
     }
 }
diff --git a/src/MyTested.AspNetCore.Mvc.ViewData/Builders/Contracts/Data/IViewBagTestBuilder.cs b/src/MyTested.AspNetCore.Mvc.ViewData/Builders/Contracts/Data/IViewBagTestBuilder.cs
index e093fbc75..7688ca97a 100644
--- a/src/MyTested.AspNetCore.Mvc.ViewData/Builders/Contracts/Data/IViewBagTestBuilder.cs
+++ b/src/MyTested.AspNetCore.Mvc.ViewData/Builders/Contracts/Data/IViewBagTestBuilder.cs
@@ -66,5 +66,20 @@ public interface IViewBagTestBuilder
         /// <param name="entries">Dictionary of view bag entries.</param>
         /// <returns>The same <see cref="IAndViewBagTestBuilder"/>.</returns>
         IAndViewBagTestBuilder ContainingEntries(IDictionary<string, object> entries);
+
+
+        /// <summary>
+        /// Tests whether the view bag entry passes the given assertions.
+        /// </summary>
+        /// <param name="assertions">Action containing all assertions for the view bag entry.</param>
+        /// <returns>The same <see cref="IAndViewBagTestBuilder"/>.</returns>
+        IAndViewBagTestBuilder Passing(Action assertions);
+
+        /// <summary>
+        /// Tests whether the view bag entry passes the given predicate.
+        /// </summary>
+        /// <param name="predicate">Predicate testing the view bag entry.</param>
+        /// <returns>The same <see cref="IAndViewBagTestBuilder"/>.</returns>
+        IAndViewBagTestBuilder Passing(Func< bool> predicate);
     }
 }
diff --git a/src/MyTested.AspNetCore.Mvc.ViewData/Builders/Data/ViewBagTestBuilder.cs b/src/MyTested.AspNetCore.Mvc.ViewData/Builders/Data/ViewBagTestBuilder.cs
index c5ec877ac..129888f0c 100644
--- a/src/MyTested.AspNetCore.Mvc.ViewData/Builders/Data/ViewBagTestBuilder.cs
+++ b/src/MyTested.AspNetCore.Mvc.ViewData/Builders/Data/ViewBagTestBuilder.cs
@@ -1,5 +1,6 @@
 namespace MyTested.AspNetCore.Mvc.Builders.Data
 {
+    using System;
     using System.Collections.Generic;
     using Contracts.Data;
     using Internal.TestContexts;
@@ -32,10 +33,23 @@ public ViewBagTestBuilder(ComponentTestContext testContext)
         /// <inheritdoc />
         public IViewBagTestBuilder AndAlso() => this;
 
+        /// <inheritdoc />
+        public IAndViewBagTestBuilder Passing(Action assertions)
+        {
+            throw new NotImplementedException();
+        }
+
+        /// <inheritdoc />
+        public IAndViewBagTestBuilder Passing(Func<bool> predicate)
+        {
+            throw new NotImplementedException();
+        }
+
         /// <summary>
         /// When overridden in derived class provides a way to built the data provider as <see cref="IDictionary{TKey,TValue}"/>.
         /// </summary>
         /// <returns>Data provider as <see cref="IDictionary{TKey,TValue}"/></returns>
         protected override IDictionary<string, object> GetDataProvider() => this.testContext.GetViewData();
+
     }
 }