diff --git a/Shared/PostCollection/CollectionSidebar.swift b/Shared/PostCollection/CollectionSidebar.swift
index 4cba6db..983ef5a 100644
--- a/Shared/PostCollection/CollectionSidebar.swift
+++ b/Shared/PostCollection/CollectionSidebar.swift
@@ -1,30 +1,26 @@
 import SwiftUI
 
 struct CollectionSidebar: View {
     @EnvironmentObject var postStore: PostStore
     @Binding var selectedCollection: PostCollection?
 
     private let collections = postCollections
 
     var body: some View {
         List {
             ForEach(collections) { collection in
                 NavigationLink(
                     destination: PostList(title: collection.title, posts: showPosts(for: collection)).tag(collection)) {
                     Text(collection.title)
                 }
             }
         }
         .listStyle(SidebarListStyle())
     }
 
-    func showPosts(for collection: PostCollection) -> [Post] {
-        if collection == allPostsCollection {
-            return postStore.posts
-        } else {
-            return postStore.posts.filter {
-                $0.collection.title == collection.title
-            }
-        }
+struct CollectionSidebar_Previews: PreviewProvider {
+    static var previews: some View {
+        CollectionSidebar()
+            .environmentObject(testPostStore)
     }
 }