Add a test for renaming open files

src/VisualStudio/IntegrationTest/IntegrationTests/Workspace/WorkspaceBase.cs

@@ -87,5 +87,20 @@ End Sub
             VisualStudio.Editor.InvokeQuickInfo();
             Assert.Equal("Sub‎ Program.M‎(p‎ As‎ Object‎)‎ ‎(‎+‎ 1‎ overload‎)", VisualStudio.Editor.GetQuickInfo());
         }
+
+        [Fact]
+        public void RenamingOpenFiles()
+        {
+            var project = new ProjectUtils.Project(ProjectName);
+            VisualStudio.SolutionExplorer.AddFile(project, "BeforeRename.cs", open: true);
+            
+            // Verify we are connected to the project before...
+            Assert.Contains(ProjectName, VisualStudio.Editor.GetProjectNavBarItems());
+
+            VisualStudio.SolutionExplorer.RenameFile(project, "BeforeRename.cs", "AfterRename.cs");
+
+            // ...and after.
+            Assert.Contains(ProjectName, VisualStudio.Editor.GetProjectNavBarItems());
+        }
     }
 }

src/VisualStudio/IntegrationTest/TestUtilities/InProcess/SolutionExplorer_InProc.cs

@@ -120,6 +120,13 @@ public string[] GetAssemblyReferences(string projectName)
             return references;
         }
 
+        public void RenameFile(string projectName, string oldFileName, string newFileName)
+        {
+            var projectItem = GetProjectItem(projectName, oldFileName);
+
+            projectItem.Name = newFileName;
+        }
+
         public void EditProjectFile(string projectName)
         {
             var solutionExplorer = ((DTE2)GetDTE()).ToolWindows.SolutionExplorer;

src/VisualStudio/IntegrationTest/TestUtilities/OutOfProcess/SolutionExplorer_OutOfProc.cs

@@ -90,6 +90,9 @@ public void OpenFileWithDesigner(ProjectUtils.Project project, string fileName)
         public void OpenFile(ProjectUtils.Project project, string fileName)
             => _inProc.OpenFile(project.Name, fileName);
 
+        public void RenameFile(ProjectUtils.Project project, string oldFileName, string newFileName)
+            => _inProc.RenameFile(project.Name, oldFileName, newFileName);
+
         public void CloseFile(ProjectUtils.Project project, string fileName, bool saveFile)
             => _inProc.CloseFile(project.Name, fileName, saveFile);