diff --git a/src/newsreader/js/pages/homepage/reducers/posts.js b/src/newsreader/js/pages/homepage/reducers/posts.js
index cdd44fa..2c1ff86 100644
--- a/src/newsreader/js/pages/homepage/reducers/posts.js
+++ b/src/newsreader/js/pages/homepage/reducers/posts.js
@@ -61,10 +61,11 @@ export const posts = (state = { ...defaultState }, action) => {
     case MARK_SECTION_READ:
       let posts = [];
 
-      // TODO: test these cases
       switch (action.section.type) {
         case CATEGORY_TYPE:
-          posts = [...state.items].forEach(post => {
+          posts = [...state.items];
+
+          posts.forEach(post => {
             if (!(post.rule.id in { ...action.section.rules })) return;
 
             post.read = true;
@@ -72,7 +73,9 @@ export const posts = (state = { ...defaultState }, action) => {
 
           break;
         case RULE_TYPE:
-          posts = [...state.items].forEach(post => {
+          posts = [...state.items];
+
+          posts.forEach(post => {
             if (post.rule.id != action.section.id) return;
 
             post.read = true;
diff --git a/src/newsreader/js/tests/homepage/reducers/post.test.js b/src/newsreader/js/tests/homepage/reducers/post.test.js
index adb8983..249a9f1 100644
--- a/src/newsreader/js/tests/homepage/reducers/post.test.js
+++ b/src/newsreader/js/tests/homepage/reducers/post.test.js
@@ -6,7 +6,7 @@ import * as actions from '../../../pages/homepage/actions/posts.js';
 import * as selectedActions from '../../../pages/homepage/actions/selected.js';
 import * as constants from '../../../pages/homepage/constants.js';
 
-const defaultState = { items: {}, isFetching: false };
+const defaultState = { items: [], isFetching: false };
 
 describe('post actions', () => {
   it('should return state after requesting posts', () => {
@@ -42,7 +42,7 @@ describe('post actions', () => {
       ...defaultState,
       isFetching: false,
       isUpdating: false,
-      items: { [post.id]: post },
+      items: [post],
     };
 
     expect(reducer(undefined, action)).toEqual(expectedState);
@@ -85,12 +85,11 @@ describe('post actions', () => {
       posts,
     };
 
-    const expectedPosts = objectsFromArray(posts, 'id');
     const expectedState = {
       ...defaultState,
       isFetching: false,
       isUpdating: false,
-      items: expectedPosts,
+      items: posts,
     };
 
     expect(reducer(undefined, action)).toEqual(expectedState);
@@ -108,7 +107,14 @@ describe('post actions', () => {
         author: 'Kyle Orland',
         publicationDate: '2020-01-24T19:50:12Z',
         url: 'https://arstechnica.com/?p=1648607',
-        rule: 5,
+        rule: {
+          id: 5,
+          name: 'Ars Technica',
+          url: 'http://feeds.arstechnica.com/arstechnica/index?fmt=xml',
+          favicon: 'https://cdn.arstechnica.net/favicon.ico',
+          category: 9,
+          unread: 544,
+        },
         read: false,
       },
       2141: {
@@ -120,7 +126,14 @@ describe('post actions', () => {
         author: 'WIRED',
         publicationDate: '2020-01-25T11:06:46Z',
         url: 'https://arstechnica.com/?p=1648757',
-        rule: 5,
+        rule: {
+          id: 5,
+          name: 'Ars Technica',
+          url: 'http://feeds.arstechnica.com/arstechnica/index?fmt=xml',
+          favicon: 'https://cdn.arstechnica.net/favicon.ico',
+          category: 9,
+          unread: 544,
+        },
         read: false,
       },
       4637: {
@@ -132,7 +145,9 @@ describe('post actions', () => {
         author: null,
         publicationDate: '2020-01-29T19:08:25Z',
         url: 'https://www.bbc.co.uk/news/world-asia-china-51299195',
-        rule: 4,
+        rule: {
+          id: 4,
+        },
         read: false,
         saved: false,
       },
@@ -145,7 +160,9 @@ describe('post actions', () => {
         author: null,
         publicationDate: '2020-01-29T18:27:56Z',
         url: 'https://www.bbc.co.uk/news/world-europe-51294305',
-        rule: 4,
+        rule: {
+          id: 4,
+        },
         read: false,
         saved: false,
       },
@@ -165,16 +182,17 @@ describe('post actions', () => {
       section: { ...rule, type: constants.RULE_TYPE },
     };
 
-    const state = { ...defaultState, items: { ...posts } };
+    const state = { ...defaultState, items: Object.values(posts) };
 
     const expectedState = {
       ...defaultState,
       isFetching: false,
-      items: {
-        ...posts,
-        2067: { ...posts[2067], read: true },
-        2141: { ...posts[2141], read: true },
-      },
+      items: [
+        { ...posts[2067], read: true },
+        { ...posts[2141], read: true },
+        { ...posts[4637] },
+        { ...posts[4638] },
+      ],
     };
 
     expect(reducer(state, action)).toEqual(expectedState);
@@ -192,7 +210,15 @@ describe('post actions', () => {
         author: 'Kyle Orland',
         publicationDate: '2020-01-24T19:50:12Z',
         url: 'https://arstechnica.com/?p=1648607',
-        rule: 5,
+        rule: {
+          id: 5,
+          name: 'BBC',
+          url: 'http://feeds.bbci.co.uk/news/world/rss.xml',
+          favicon:
+            'https://m.files.bbci.co.uk/modules/bbc-morph-news-waf-page-meta/2.5.2/apple-touch-icon-57x57-precomposed.png',
+          category: 8,
+          unread: 632,
+        },
         read: false,
         saved: false,
       },
@@ -205,7 +231,15 @@ describe('post actions', () => {
         author: 'WIRED',
         publicationDate: '2020-01-25T11:06:46Z',
         url: 'https://arstechnica.com/?p=1648757',
-        rule: 5,
+        rule: {
+          id: 5,
+          name: 'BBC',
+          url: 'http://feeds.bbci.co.uk/news/world/rss.xml',
+          favicon:
+            'https://m.files.bbci.co.uk/modules/bbc-morph-news-waf-page-meta/2.5.2/apple-touch-icon-57x57-precomposed.png',
+          category: 8,
+          unread: 632,
+        },
         read: false,
         saved: false,
       },
@@ -218,7 +252,15 @@ describe('post actions', () => {
         author: null,
         publicationDate: '2020-01-29T19:08:25Z',
         url: 'https://www.bbc.co.uk/news/world-asia-china-51299195',
-        rule: 4,
+        rule: {
+          id: 4,
+          name: 'BBC',
+          url: 'http://feeds.bbci.co.uk/news/world/rss.xml',
+          favicon:
+            'https://m.files.bbci.co.uk/modules/bbc-morph-news-waf-page-meta/2.5.2/apple-touch-icon-57x57-precomposed.png',
+          category: 8,
+          unread: 321,
+        },
         read: false,
         saved: false,
       },
@@ -231,7 +273,15 @@ describe('post actions', () => {
         author: null,
         publicationDate: '2020-01-29T18:27:56Z',
         url: 'https://www.bbc.co.uk/news/world-europe-51294305',
-        rule: 4,
+        rule: {
+          id: 4,
+          name: 'BBC',
+          url: 'http://feeds.bbci.co.uk/news/world/rss.xml',
+          favicon:
+            'https://m.files.bbci.co.uk/modules/bbc-morph-news-waf-page-meta/2.5.2/apple-touch-icon-57x57-precomposed.png',
+          category: 8,
+          unread: 321,
+        },
         read: false,
         saved: false,
       },
@@ -245,7 +295,9 @@ describe('post actions', () => {
         publicationDate: '2020-01-29T19:03:01Z',
         url:
           'https://tweakers.net/nieuws/162878/analyse-nintendo-verdiende-miljard-dollar-aan-mobiele-games.html',
-        rule: 7,
+        rule: {
+          id: 7,
+        },
         read: false,
         saved: false,
       },
@@ -259,7 +311,9 @@ describe('post actions', () => {
         publicationDate: '2020-01-29T16:29:40Z',
         url:
           'https://tweakers.net/nieuws/162870/samsung-kondigt-eerste-tablet-met-5g-aan.html',
-        rule: 7,
+        rule: {
+          id: 7,
+        },
         read: false,
         saved: false,
       },
@@ -276,7 +330,7 @@ describe('post actions', () => {
         unread: 321,
       },
       5: {
-        id: 4,
+        id: 5,
         name: 'BBC',
         url: 'http://feeds.bbci.co.uk/news/world/rss.xml',
         favicon:
@@ -301,18 +355,19 @@ describe('post actions', () => {
       },
     };
 
-    const state = { ...defaultState, items: { ...posts } };
+    const state = { ...defaultState, items: Object.values(posts) };
 
     const expectedState = {
       ...defaultState,
       isFetching: false,
-      items: {
-        ...posts,
-        2067: { ...posts[2067], read: true },
-        2141: { ...posts[2141], read: true },
-        4637: { ...posts[4637], read: true },
-        4638: { ...posts[4638], read: true },
-      },
+      items: [
+        { ...posts[2067], read: true },
+        { ...posts[2141], read: true },
+        { ...posts[4589] },
+        { ...posts[4594] },
+        { ...posts[4637], read: true },
+        { ...posts[4638], read: true },
+      ],
     };
 
     expect(reducer(state, action)).toEqual(expectedState);