Fix tests

tests/ImageSharp.Tests/MetaData/Profiles/Exif/ExifProfileTests.cs

@@ -255,7 +255,7 @@ namespace SixLabors.ImageSharp.Tests
         [Fact]
         public void WriteTooLargeProfile()
         {
-            StringBuilder junk = new StringBuilder();
+            var junk = new StringBuilder();
             for (int i = 0; i < 65500; i++)
             {
                 junk.Append("I");

tests/ImageSharp.Tests/MetaData/Profiles/Exif/ExifReaderTests.cs

@@ -1,6 +1,7 @@
 // Copyright (c) Six Labors and contributors.
 // Licensed under the Apache License, Version 2.0.
 
+using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using SixLabors.ImageSharp.MetaData.Profiles.Exif;
 using Xunit;
@@ -12,10 +13,10 @@ namespace SixLabors.ImageSharp.Tests
         [Fact]
         public void Read_DataIsEmpty_ReturnsEmptyCollection()
         {
-            ExifReader reader = new ExifReader();
+            var reader = new ExifReader();
             byte[] data = new byte[] { };
 
-            Collection<ExifValue> result = reader.Read(data);
+            IList<ExifValue> result = reader.Read(data);
 
             Assert.Equal(0, result.Count);
         }
@@ -23,10 +24,10 @@ namespace SixLabors.ImageSharp.Tests
         [Fact]
         public void Read_DataIsMinimal_ReturnsEmptyCollection()
         {
-            ExifReader reader = new ExifReader();
+            var reader = new ExifReader();
             byte[] data = new byte[] { 69, 120, 105, 102, 0, 0 };
 
-            Collection<ExifValue> result = reader.Read(data);
+            IList<ExifValue> result = reader.Read(data);
 
             Assert.Equal(0, result.Count);
         }