Ensure RetrieveStatus honors "assumed-unchanged" flag

Author: nulltoken

LibGit2Sharp.Tests/StatusFixture.cs

@@ -581,5 +581,16 @@ public void CanRetrieveTheStatusOfAGlobSpec()
                 Assert.Equal(2, status.Untracked.Count());
             }
         }
+
+        [Fact]
+        public void RetrievingTheStatusHonorsAssumedUnchangedMarkedIndexEntries()
+        {
+            var path = SandboxAssumeUnchangedTestRepo();
+            using (var repo = new Repository(path))
+            {
+                var status = repo.RetrieveStatus();
+                Assert.Equal("hello.txt", status.Modified.Single().FilePath);
+            }
+        }
     }
 }

LibGit2Sharp.Tests/TestHelpers/BaseFixture.cs

@@ -68,6 +68,7 @@ private static void SetUpTestEnvironment()
             RevertTestRepoWorkingDirPath = Path.Combine(sourceRelativePath, "revert_testrepo_wd");
             SubmoduleTestRepoWorkingDirPath = Path.Combine(sourceRelativePath, "submodule_wd");
             SubmoduleTargetTestRepoWorkingDirPath = Path.Combine(sourceRelativePath, "submodule_target_wd");
+            AssumeUnchangedRepoWorkingDirPath = Path.Combine(sourceRelativePath, "assume_unchanged_wd");
         }
 
         private static bool IsFileSystemCaseSensitiveInternal()