diff --git a/src/js/services/badge-setter.test.ts b/src/js/services/badge-setter.test.js
similarity index 94%
rename from src/js/services/badge-setter.test.ts
rename to src/js/services/badge-setter.test.js
index b7370b2..d413855 100644
--- a/src/js/services/badge-setter.test.ts
+++ b/src/js/services/badge-setter.test.js
@@ -1,17 +1,21 @@
+/**
+ * @typedef {import('../static/types').PullRequestRecord} PullRequestRecord
+ */
+
 import BadgeSetter from './badge-setter.js';
-import { PullRequestRecord } from '../static/types';
-import { pullRequestRecordFactory } from '../../../__test__/mocks/factories';
+import { pullRequestRecordFactory } from '../../../__test__/mocks/factories.js';
 
 global.chrome = {
   action: {
     setBadgeText: jest.fn(),
     setBadgeBackgroundColor: jest.fn(),
   },
-} as any;
+};
 
 describe('BadgeSetter', () => {
   describe('update', () => {
-    let record: PullRequestRecord;
+    /** @type {PullRequestRecord} */
+    let record;
     let counter = {
       'reviewRequested': true,
       'teamReviewRequested': true,
diff --git a/src/js/services/html-generator.test.ts b/src/js/services/html-generator.test.js
similarity index 70%
rename from src/js/services/html-generator.test.ts
rename to src/js/services/html-generator.test.js
index dd32ce1..f767852 100644
--- a/src/js/services/html-generator.test.ts
+++ b/src/js/services/html-generator.test.js
@@ -1,10 +1,11 @@
 /**
  * @jest-environment jsdom
+ * @typedef {import('../static/types').CounterConfig} CounterConfig
+ * @typedef {import('../static/types').PullRequestRecord} PullRequestRecord
  */
 
-import HTMLGenerator from './html-generator';
-import { CounterConfig, PullRequestRecord } from '../static/types';
-import { pullRequestRecordFactory } from '../../../__test__/mocks/factories';
+import HTMLGenerator from './html-generator.js';
+import { pullRequestRecordFactory } from '../../../__test__/mocks/factories.js';
 
 describe('HTMLGenerator', () => {
   const htmlGenerator = HTMLGenerator();
@@ -18,9 +19,12 @@ describe('HTMLGenerator', () => {
   };
 
   describe('#generate', () => {
-    let record: PullRequestRecord;
-    let counter: CounterConfig;
-    let result: HTMLDivElement;
+    /** @type {PullRequestRecord} */
+    let record;
+    /** @type {CounterConfig} */
+    let counter;
+    /** @type {HTMLDivElement} */
+    let result;
 
     beforeEach(() => {
       result = htmlGenerator.generate(record, counter);
@@ -44,11 +48,11 @@ describe('HTMLGenerator', () => {
       });
 
       it('has the correct <p> as its first child', () => {
-        expect(result.innerHTML).toContain('I must review');
+        expect(result.childNodes[0].innerHTML).toEqual('I must review');
       });
 
       it('has the correct <div> as its second child', () => {
-        expect((result.childNodes[1] as HTMLDivElement).className).toEqual('group-container');
+        expect(result.childNodes[1].className).toEqual('group-container');
       });
 
       describe('second child', () => {
@@ -58,7 +62,7 @@ describe('HTMLGenerator', () => {
 
         describe('<div>', () => {
           it('has the correct link', () => {
-            const a = result.querySelector('.pr-link') as HTMLAnchorElement;
+            const a = result.childNodes[1].childNodes[0].childNodes[0];
 
             expect(a.href).toEqual('https://github.com/renuo/github-pull-request-counter/pull/1');
             expect(a.target).toEqual('_blank');
@@ -66,8 +70,11 @@ describe('HTMLGenerator', () => {
           });
 
           it('has the correct subdescription', () => {
-            const p = result.querySelector('.repo-link') as HTMLParagraphElement;
-            expect(p.innerHTML).toContain('renuo/github-pull-request-counter');
+            const p = result.childNodes[1].childNodes[0].childNodes[1];
+            const age = Math.floor(record.reviewRequested[0].ageInDays);
+            const id = record.reviewRequested[0].id;
+
+            expect(p.innerHTML).toEqual(`renuo/github-pull-request-counter<b> #${id}</b> (${age} days ago)`);
           });
         });
       });
@@ -86,11 +93,11 @@ describe('HTMLGenerator', () => {
         });
 
         it('the title has an additional class', () => {
-          expect((result.childNodes[0] as HTMLParagraphElement).classList.value).toEqual('title less-relevant-group');
+          expect(result.childNodes[0].classList.value).toEqual('title less-relevant-group');
         });
 
         it('the group container has an additional class', () => {
-          expect((result.childNodes[1] as HTMLDivElement).classList.value).toEqual('group-container less-relevant-group');
+          expect(result.childNodes[1].classList.value).toEqual('group-container less-relevant-group');
         });
       });
     });