Update tests

tests/ImageSharp.Tests/MetaData/ImageFrameMetaDataTests.cs

@@ -5,6 +5,7 @@
 
 namespace ImageSharp.Tests
 {
+    using ImageSharp.Formats;
     using Xunit;
 
     /// <summary>
@@ -17,10 +18,12 @@ namespace ImageSharp.Tests
         {
             ImageFrameMetaData metaData = new ImageFrameMetaData();
             metaData.FrameDelay = 42;
+            metaData.DisposalMethod = DisposalMethod.RestoreToBackground;
 
             ImageFrameMetaData clone = new ImageFrameMetaData(metaData);
 
             Assert.Equal(42, clone.FrameDelay);
+            Assert.Equal(DisposalMethod.RestoreToBackground, clone.DisposalMethod);
         }
     }
 }

tests/ImageSharp.Tests/MetaData/ImageMetaDataTests.cs

@@ -5,6 +5,7 @@
 
 namespace ImageSharp.Tests
 {
+    using ImageSharp.Formats;
     using Xunit;
 
     /// <summary>
@@ -27,6 +28,7 @@ namespace ImageSharp.Tests
             metaData.Properties.Add(imageProperty);
             metaData.Quality = 24;
             metaData.RepeatCount = 1;
+            metaData.DisposalMethod = DisposalMethod.RestoreToBackground;
 
             ImageMetaData clone = new ImageMetaData(metaData);
 
@@ -37,6 +39,7 @@ namespace ImageSharp.Tests
             Assert.Equal(imageProperty, clone.Properties[0]);
             Assert.Equal(24, clone.Quality);
             Assert.Equal(1, clone.RepeatCount);
+            Assert.Equal(DisposalMethod.RestoreToBackground, clone.DisposalMethod);
         }
 
         [Fact]