Unload project based on Project entity

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

@@ -827,9 +827,19 @@ public void ShowErrorList()
         public void ShowOutputWindow()
             => ExecuteCommand(WellKnownCommandNames.View_Output);
 
-        public void UnloadProject(int index)
+        public void UnloadProject(string projectName)
         {
-            var project = _solution.Projects.Item(index);
+            var projects = _solution.Projects;
+            EnvDTE.Project project = null;
+            for (int i = 1; i <= projects.Count; i++)
+            {
+                project = projects.Item(i);
+                if (string.Compare(project.Name, projectName, StringComparison.Ordinal) == 0)
+                {
+                    break;
+                }
+            }
+
             _solution.Remove(project);
         }
 

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

@@ -128,12 +128,8 @@ public void SaveAll()
         public void ShowOutputWindow()
             => _inProc.ShowOutputWindow();
 
-        /// <summary>
-        /// Unloads the project. <paramref name="index"/> is 1 based.
-        /// </summary>
-        /// <param name="index"></param>
-        public void UnloadProject(int index)
-            => _inProc.UnloadProject(index);
+        public void UnloadProject(ProjectUtils.Project project)
+            => _inProc.UnloadProject(project.Name);
 
         public string[] GetProjectReferences(ProjectUtils.Project project)
             => _inProc.GetProjectReferences(project.Name);