a better test!

shiftkey · shiftkey · commit b179214eb71d · 2015-05-14T20:08:58.000+09:30
diff --git a/LibGit2Sharp.Tests/IndexFixture.cs b/LibGit2Sharp.Tests/IndexFixture.cs
@@ -490,6 +490,33 @@ public void CanUpdateIndexWhenNothingHappened()
             }
         }
 
+        [Fact]
+        public void IndexIsUpdatedAfterAddingFile()
+        {
+            const string fileName = "new-file.txt";
+
+            var path = SandboxAssumeUnchangedTestRepo();
+            using (var repo = new Repository(path))
+            {
+                // create a file on disk
+                Touch(repo.Info.WorkingDirectory, fileName, "hello test file\n");
+
+                repo.Index.Clear();
+                repo.Index.Add(fileName);
+
+                var first = repo.Index[fileName].Id;
+
+                Touch(repo.Info.WorkingDirectory, fileName, "rewrite the file\n");
+
+                repo.Index.Update();
+
+                var second = repo.Index[fileName].Id;
+
+                Assert.NotEqual(first, second);
+            }
+        }
+
+
         private static void AddSomeCornerCases(Repository repo)
         {
             // Turn 1.txt into a directory in the Index
