Added test for blobToBlob compare

Author: Stijn-Rutten

LibGit2Sharp.Tests/DiffBlobToBlobFixture.cs

@@ -1,7 +1,7 @@
-using System.IO;
+using LibGit2Sharp.Tests.TestHelpers;
+using System.IO;
 using System.Linq;
 using System.Text;
-using LibGit2Sharp.Tests.TestHelpers;
 using Xunit;
 
 namespace LibGit2Sharp.Tests
@@ -202,6 +202,34 @@ public void ComparingBlobsWithNoSpacesIndentHeuristicOptionMakesNoDifference()
             }
         }
 
+        [Fact]
+        public void DiffSetsTheAddedAndDeletedLinesCorrectly()
+        {
+            var path = SandboxStandardTestRepoGitDir();
+
+            using (var repo = new Repository(path))
+            {
+                var oldContent =
+                @"1
+2
+3
+4";
+
+                var newContent =
+                   @"1
+2
+3
+5";
+                var oldBlob = repo.ObjectDatabase.CreateBlob(new MemoryStream(Encoding.UTF8.GetBytes(oldContent)));
+                var newBlob = repo.ObjectDatabase.CreateBlob(new MemoryStream(Encoding.UTF8.GetBytes(newContent)));
+
+                ContentChanges changes = repo.Diff.Compare(oldBlob, newBlob);
+
+                Assert.Single(changes.AddedLines);
+                Assert.Single(changes.DeletedLines);
+            }
+        }
+
         static string CanonicalChangedLines(ContentChanges changes)
         {
             // Create an ordered representation of lines that have been added or removed