Test for IndentHeuristic Diff option

jcansdale · jcansdale · commit 6a6f1345d8bc · 2018-12-19T18:02:20.000Z
This test is based on example from: https://github.com/git/git/blob/433860f3d0beb0c6f205290bd16cda413148f098/t/t4061-diff-indent.sh#L17
diff --git a/LibGit2Sharp.Tests/DiffBlobToBlobFixture.cs b/LibGit2Sharp.Tests/DiffBlobToBlobFixture.cs
@@ -126,5 +126,44 @@ public void ComparingTwoNullBlobsReturnsAnEmptyContentChanges()
                 Assert.Equal(0, changes.LinesDeleted);
             }
         }
+
+        [Fact]
+        public void ComparingBlobsWithIndentHeuristicOptionMakesADifference()
+        {
+            var path = SandboxStandardTestRepoGitDir();
+            using (var repo = new Repository(path))
+            {
+                // Based on test diff indent heuristic from:
+                // https://github.com/git/git/blob/433860f3d0beb0c6f205290bd16cda413148f098/t/t4061-diff-indent.sh#L17
+                var oldContent =
+@"	1
+	2
+	a
+
+	b
+	3
+	4";
+                var newContent =
+@"	1
+	2
+	a
+
+	b
+	a
+
+	b
+	3
+	4";
+                var oldBlob = repo.ObjectDatabase.CreateBlob(new MemoryStream(Encoding.UTF8.GetBytes(oldContent)));
+                var newBlob = repo.ObjectDatabase.CreateBlob(new MemoryStream(Encoding.UTF8.GetBytes(newContent)));
+                var noIndentHeuristicOption = new CompareOptions { IndentHeuristic = false };
+                var indentHeuristicOption = new CompareOptions { IndentHeuristic = true };
+
+                ContentChanges changes0 = repo.Diff.Compare(oldBlob, newBlob, noIndentHeuristicOption);
+                ContentChanges changes1 = repo.Diff.Compare(oldBlob, newBlob, indentHeuristicOption);
+
+                Assert.NotEqual(changes0.Patch, changes1.Patch);
+            }
+        }
     }
 }
