From 0c5539c46b188937dcfab01a1ef9897be860fc56 Mon Sep 17 00:00:00 2001
From: Florian Levis <levis.florian@gmail.com>
Date: Fri, 3 May 2024 15:34:16 +0200
Subject: [PATCH] tests: update tests following code review

---
 .../Statistics/MomentsTests/TheGetChannelMethod.cs        | 2 +-
 .../Statistics/PerceptualHashTests/TheGetChannelMethod.cs | 2 +-
 .../PerceptualHashTests/TheSumSquaredDistanceMethod.cs    | 8 ++++----
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/tests/Magick.NET.Tests/Statistics/MomentsTests/TheGetChannelMethod.cs b/tests/Magick.NET.Tests/Statistics/MomentsTests/TheGetChannelMethod.cs
index 34d45be891..5cbf51c2a0 100644
--- a/tests/Magick.NET.Tests/Statistics/MomentsTests/TheGetChannelMethod.cs
+++ b/tests/Magick.NET.Tests/Statistics/MomentsTests/TheGetChannelMethod.cs
@@ -11,7 +11,7 @@ public partial class MomentsTests
     public class TheGetChannelMethod
     {
         [Fact]
-        public void ShouldThrowExceptionWhenChannelDoesNotExist()
+        public void ShouldReturnNullWhenChannelDoesNotExist()
         {
             using var image = new MagickImage(Files.ImageMagickJPG);
             var moments = image.Moments();
diff --git a/tests/Magick.NET.Tests/Statistics/PerceptualHashTests/TheGetChannelMethod.cs b/tests/Magick.NET.Tests/Statistics/PerceptualHashTests/TheGetChannelMethod.cs
index 0ec1f1cb6a..5f66459ddc 100644
--- a/tests/Magick.NET.Tests/Statistics/PerceptualHashTests/TheGetChannelMethod.cs
+++ b/tests/Magick.NET.Tests/Statistics/PerceptualHashTests/TheGetChannelMethod.cs
@@ -11,7 +11,7 @@ public partial class PerceptualHashTests
     public class TheGetChannelMethod
     {
         [Fact]
-        public void ShouldThrowExceptionWhenChannelDoesNotExist()
+        public void ShouldReturnNullWhenChannelDoesNotExist()
         {
             var hash = new PerceptualHash("81b4488652898d48a7a9622346206e620f8a646682939835e986ec98c78f887ae8c67f81b1e884c58a0d18af2d622718fd35623ffdeac9a78cbaedaa81d888434e824c683ad781c37895978c8688c426628ed61b216279b81b48887318a1628af43622a2619d162372");
 
diff --git a/tests/Magick.NET.Tests/Statistics/PerceptualHashTests/TheSumSquaredDistanceMethod.cs b/tests/Magick.NET.Tests/Statistics/PerceptualHashTests/TheSumSquaredDistanceMethod.cs
index 377e359365..003a1d6c12 100644
--- a/tests/Magick.NET.Tests/Statistics/PerceptualHashTests/TheSumSquaredDistanceMethod.cs
+++ b/tests/Magick.NET.Tests/Statistics/PerceptualHashTests/TheSumSquaredDistanceMethod.cs
@@ -12,9 +12,7 @@ public partial class PerceptualHashTests
     public class TestPerceptualHash : IPerceptualHash
     {
         public IChannelPerceptualHash GetChannel(PixelChannel channel)
-        {
-            return null;
-        }
+            => null;
 
         public double SumSquaredDistance(IPerceptualHash other)
         {
@@ -29,8 +27,10 @@ public void ShouldThrowNotSupportedExceptionIfCustomImplementationDoesNotHaveExp
         {
             using var image = new MagickImage(Files.ImageMagickJPG);
             var phash = image.PerceptualHash();
+            Assert.NotNull(phash);
 
-            Assert.Throws<NotSupportedException>(() => phash.SumSquaredDistance(new TestPerceptualHash()));
+            var exception = Assert.Throws<NotSupportedException>(() => phash.SumSquaredDistance(new TestPerceptualHash()));
+            Assert.Equal("other IPerceptualHash must have Red, Green and Blue channel", exception.Message);
         }
 
         [Fact]