From 060a3d35b6355771820a1662ecb4a3d0510d4eb1 Mon Sep 17 00:00:00 2001
From: Abdol Baset Sedighi <118891407+94sedighi@users.noreply.github.com>
Date: Wed, 21 Dec 2022 16:42:49 +0100
Subject: [PATCH] Add `ThatAre[Not]Interfaces` to `TypeSelector.cs` (#2057)

---
 Src/FluentAssertions/Types/TypeSelector.cs    | 18 +++++++
 .../FluentAssertions/net47.verified.txt       |  2 +
 .../FluentAssertions/net6.0.verified.txt      |  2 +
 .../netcoreapp2.1.verified.txt                |  2 +
 .../netcoreapp3.0.verified.txt                |  2 +
 .../netstandard2.0.verified.txt               |  2 +
 .../netstandard2.1.verified.txt               |  2 +
 .../Types/TypeSelectorSpecs.cs                | 51 +++++++++++++++++++
 docs/_pages/releases.md                       |  1 +
 9 files changed, 82 insertions(+)

diff --git a/Src/FluentAssertions/Types/TypeSelector.cs b/Src/FluentAssertions/Types/TypeSelector.cs
index b22f059d79..d5e3cb62b8 100644
--- a/Src/FluentAssertions/Types/TypeSelector.cs
+++ b/Src/FluentAssertions/Types/TypeSelector.cs
@@ -219,6 +219,24 @@ public TypeSelector ThatAreNotSealed()
         return this;
     }
 
+    /// <summary>
+    /// Filters and returns only the types that are interfaces
+    /// </summary>
+    public TypeSelector ThatAreInterfaces()
+    {
+        types = types.Where(t => t.IsInterface).ToList();
+        return this;
+    }
+
+    /// <summary>
+    /// Filters and returns only the types that are not interfaces
+    /// </summary>
+    public TypeSelector ThatAreNotInterfaces()
+    {
+        types = types.Where(t => !t.IsInterface).ToList();
+        return this;
+    }
+
     /// <summary>
     /// Determines whether the type is static
     /// </summary>
diff --git a/Tests/Approval.Tests/ApprovedApi/FluentAssertions/net47.verified.txt b/Tests/Approval.Tests/ApprovedApi/FluentAssertions/net47.verified.txt
index e4791ac991..225201d49e 100644
--- a/Tests/Approval.Tests/ApprovedApi/FluentAssertions/net47.verified.txt
+++ b/Tests/Approval.Tests/ApprovedApi/FluentAssertions/net47.verified.txt
@@ -2656,6 +2656,7 @@ namespace FluentAssertions.Types
         public FluentAssertions.Types.TypeSelector ThatAreDecoratedWithOrInherit<TAttribute>()
             where TAttribute : System.Attribute { }
         public FluentAssertions.Types.TypeSelector ThatAreInNamespace(string @namespace) { }
+        public FluentAssertions.Types.TypeSelector ThatAreInterfaces() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotAbstract() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotClasses() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotDecoratedWith<TAttribute>()
@@ -2663,6 +2664,7 @@ namespace FluentAssertions.Types
         public FluentAssertions.Types.TypeSelector ThatAreNotDecoratedWithOrInherit<TAttribute>()
             where TAttribute : System.Attribute { }
         public FluentAssertions.Types.TypeSelector ThatAreNotInNamespace(string @namespace) { }
+        public FluentAssertions.Types.TypeSelector ThatAreNotInterfaces() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotSealed() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotStatic() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotUnderNamespace(string @namespace) { }
diff --git a/Tests/Approval.Tests/ApprovedApi/FluentAssertions/net6.0.verified.txt b/Tests/Approval.Tests/ApprovedApi/FluentAssertions/net6.0.verified.txt
index 029ff8811d..e7bdbbf01f 100644
--- a/Tests/Approval.Tests/ApprovedApi/FluentAssertions/net6.0.verified.txt
+++ b/Tests/Approval.Tests/ApprovedApi/FluentAssertions/net6.0.verified.txt
@@ -2786,6 +2786,7 @@ namespace FluentAssertions.Types
         public FluentAssertions.Types.TypeSelector ThatAreDecoratedWithOrInherit<TAttribute>()
             where TAttribute : System.Attribute { }
         public FluentAssertions.Types.TypeSelector ThatAreInNamespace(string @namespace) { }
+        public FluentAssertions.Types.TypeSelector ThatAreInterfaces() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotAbstract() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotClasses() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotDecoratedWith<TAttribute>()
@@ -2793,6 +2794,7 @@ namespace FluentAssertions.Types
         public FluentAssertions.Types.TypeSelector ThatAreNotDecoratedWithOrInherit<TAttribute>()
             where TAttribute : System.Attribute { }
         public FluentAssertions.Types.TypeSelector ThatAreNotInNamespace(string @namespace) { }
+        public FluentAssertions.Types.TypeSelector ThatAreNotInterfaces() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotSealed() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotStatic() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotUnderNamespace(string @namespace) { }
diff --git a/Tests/Approval.Tests/ApprovedApi/FluentAssertions/netcoreapp2.1.verified.txt b/Tests/Approval.Tests/ApprovedApi/FluentAssertions/netcoreapp2.1.verified.txt
index 8c05e9795d..2943c1c55b 100644
--- a/Tests/Approval.Tests/ApprovedApi/FluentAssertions/netcoreapp2.1.verified.txt
+++ b/Tests/Approval.Tests/ApprovedApi/FluentAssertions/netcoreapp2.1.verified.txt
@@ -2658,6 +2658,7 @@ namespace FluentAssertions.Types
         public FluentAssertions.Types.TypeSelector ThatAreDecoratedWithOrInherit<TAttribute>()
             where TAttribute : System.Attribute { }
         public FluentAssertions.Types.TypeSelector ThatAreInNamespace(string @namespace) { }
+        public FluentAssertions.Types.TypeSelector ThatAreInterfaces() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotAbstract() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotClasses() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotDecoratedWith<TAttribute>()
@@ -2665,6 +2666,7 @@ namespace FluentAssertions.Types
         public FluentAssertions.Types.TypeSelector ThatAreNotDecoratedWithOrInherit<TAttribute>()
             where TAttribute : System.Attribute { }
         public FluentAssertions.Types.TypeSelector ThatAreNotInNamespace(string @namespace) { }
+        public FluentAssertions.Types.TypeSelector ThatAreNotInterfaces() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotSealed() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotStatic() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotUnderNamespace(string @namespace) { }
diff --git a/Tests/Approval.Tests/ApprovedApi/FluentAssertions/netcoreapp3.0.verified.txt b/Tests/Approval.Tests/ApprovedApi/FluentAssertions/netcoreapp3.0.verified.txt
index 8c05e9795d..2943c1c55b 100644
--- a/Tests/Approval.Tests/ApprovedApi/FluentAssertions/netcoreapp3.0.verified.txt
+++ b/Tests/Approval.Tests/ApprovedApi/FluentAssertions/netcoreapp3.0.verified.txt
@@ -2658,6 +2658,7 @@ namespace FluentAssertions.Types
         public FluentAssertions.Types.TypeSelector ThatAreDecoratedWithOrInherit<TAttribute>()
             where TAttribute : System.Attribute { }
         public FluentAssertions.Types.TypeSelector ThatAreInNamespace(string @namespace) { }
+        public FluentAssertions.Types.TypeSelector ThatAreInterfaces() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotAbstract() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotClasses() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotDecoratedWith<TAttribute>()
@@ -2665,6 +2666,7 @@ namespace FluentAssertions.Types
         public FluentAssertions.Types.TypeSelector ThatAreNotDecoratedWithOrInherit<TAttribute>()
             where TAttribute : System.Attribute { }
         public FluentAssertions.Types.TypeSelector ThatAreNotInNamespace(string @namespace) { }
+        public FluentAssertions.Types.TypeSelector ThatAreNotInterfaces() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotSealed() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotStatic() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotUnderNamespace(string @namespace) { }
diff --git a/Tests/Approval.Tests/ApprovedApi/FluentAssertions/netstandard2.0.verified.txt b/Tests/Approval.Tests/ApprovedApi/FluentAssertions/netstandard2.0.verified.txt
index 6af101d69f..2d81d1b460 100644
--- a/Tests/Approval.Tests/ApprovedApi/FluentAssertions/netstandard2.0.verified.txt
+++ b/Tests/Approval.Tests/ApprovedApi/FluentAssertions/netstandard2.0.verified.txt
@@ -2607,6 +2607,7 @@ namespace FluentAssertions.Types
         public FluentAssertions.Types.TypeSelector ThatAreDecoratedWithOrInherit<TAttribute>()
             where TAttribute : System.Attribute { }
         public FluentAssertions.Types.TypeSelector ThatAreInNamespace(string @namespace) { }
+        public FluentAssertions.Types.TypeSelector ThatAreInterfaces() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotAbstract() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotClasses() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotDecoratedWith<TAttribute>()
@@ -2614,6 +2615,7 @@ namespace FluentAssertions.Types
         public FluentAssertions.Types.TypeSelector ThatAreNotDecoratedWithOrInherit<TAttribute>()
             where TAttribute : System.Attribute { }
         public FluentAssertions.Types.TypeSelector ThatAreNotInNamespace(string @namespace) { }
+        public FluentAssertions.Types.TypeSelector ThatAreNotInterfaces() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotSealed() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotStatic() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotUnderNamespace(string @namespace) { }
diff --git a/Tests/Approval.Tests/ApprovedApi/FluentAssertions/netstandard2.1.verified.txt b/Tests/Approval.Tests/ApprovedApi/FluentAssertions/netstandard2.1.verified.txt
index 8c05e9795d..2943c1c55b 100644
--- a/Tests/Approval.Tests/ApprovedApi/FluentAssertions/netstandard2.1.verified.txt
+++ b/Tests/Approval.Tests/ApprovedApi/FluentAssertions/netstandard2.1.verified.txt
@@ -2658,6 +2658,7 @@ namespace FluentAssertions.Types
         public FluentAssertions.Types.TypeSelector ThatAreDecoratedWithOrInherit<TAttribute>()
             where TAttribute : System.Attribute { }
         public FluentAssertions.Types.TypeSelector ThatAreInNamespace(string @namespace) { }
+        public FluentAssertions.Types.TypeSelector ThatAreInterfaces() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotAbstract() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotClasses() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotDecoratedWith<TAttribute>()
@@ -2665,6 +2666,7 @@ namespace FluentAssertions.Types
         public FluentAssertions.Types.TypeSelector ThatAreNotDecoratedWithOrInherit<TAttribute>()
             where TAttribute : System.Attribute { }
         public FluentAssertions.Types.TypeSelector ThatAreNotInNamespace(string @namespace) { }
+        public FluentAssertions.Types.TypeSelector ThatAreNotInterfaces() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotSealed() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotStatic() { }
         public FluentAssertions.Types.TypeSelector ThatAreNotUnderNamespace(string @namespace) { }
diff --git a/Tests/FluentAssertions.Specs/Types/TypeSelectorSpecs.cs b/Tests/FluentAssertions.Specs/Types/TypeSelectorSpecs.cs
index ec0872031f..af2c740f4f 100644
--- a/Tests/FluentAssertions.Specs/Types/TypeSelectorSpecs.cs
+++ b/Tests/FluentAssertions.Specs/Types/TypeSelectorSpecs.cs
@@ -5,6 +5,7 @@
 using System.Threading.Tasks;
 using FluentAssertions.Types;
 using Internal.AbstractAndNotAbstractClasses.Test;
+using Internal.InterfaceAndClasses.Test;
 using Internal.Main.Test;
 using Internal.NotOnlyClasses.Test;
 using Internal.Other.Test;
@@ -643,6 +644,41 @@ public void When_unwrap_enumerable_types_it_should_return_the_correct_types()
                 .And.Contain(typeof(int))
                 .And.Contain(typeof(string));
         }
+
+        [Fact]
+        public void When_selecting_types_that_are_interfaces_it_should_return_the_correct_types()
+        {
+            // Arrange
+            Assembly assembly = typeof(InternalInterface).GetTypeInfo().Assembly;
+
+            // Act
+            IEnumerable<Type> types = AllTypes.From(assembly)
+                .ThatAreInNamespace("Internal.InterfaceAndClasses.Test")
+                .ThatAreInterfaces();
+
+            // Assert
+            types.Should()
+                .ContainSingle()
+                .Which.Should().Be(typeof(InternalInterface));
+        }
+
+        [Fact]
+        public void When_selecting_types_that_are_not_interfaces_it_should_return_the_correct_types()
+        {
+            // Arrange
+            Assembly assembly = typeof(InternalNotInterfaceClass).GetTypeInfo().Assembly;
+
+            // Act
+            IEnumerable<Type> types = AllTypes.From(assembly)
+                .ThatAreInNamespace("Internal.InterfaceAndClasses.Test")
+                .ThatAreNotInterfaces();
+
+            // Assert
+            types.Should()
+                .HaveCount(2)
+                .And.Contain(typeof(InternalNotInterfaceClass))
+                .And.Contain(typeof(InternalAbstractClass));
+        }
     }
 }
 
@@ -779,6 +815,21 @@ internal static class NotAbstractStaticClass
     }
 }
 
+namespace Internal.InterfaceAndClasses.Test
+{
+    internal interface InternalInterface
+    {
+    }
+
+    internal abstract class InternalAbstractClass
+    {
+    }
+
+    internal class InternalNotInterfaceClass
+    {
+    }
+}
+
 namespace Internal.UnwrapSelectorTestTypes.Test
 {
     internal class ClassToExploreUnwrappedTaskTypes
diff --git a/docs/_pages/releases.md b/docs/_pages/releases.md
index 0c5c3a0afb..ef1a285352 100644
--- a/docs/_pages/releases.md
+++ b/docs/_pages/releases.md
@@ -10,6 +10,7 @@ sidebar:
 ## Unreleased
 
 ### What's new
+* Added `ThatAre[Not]Interfaces` method for filtering the types - [#2057](https://github.com/fluentassertions/fluentassertions/pull/2057)
 * Added `ThatAre[Not]Abstract` method for filtering the types - [#2058](https://github.com/fluentassertions/fluentassertions/pull/2058)
 * Added `ThatAre[Not]Sealed` method for filtering the types - [#2059](https://github.com/fluentassertions/fluentassertions/pull/2059)
 * Added `ThatAre[Not]Abstract` methods to `MethodInfoSelector.cs` for filtering the methods - [#2060](https://github.com/fluentassertions/fluentassertions/pull/2060)