fix: idle duration not updated when user hides page (#54)

Co-authored-by: xiaoweii <xiaoweii@amazom.com>

Author: zhu-xiaowei

src/tracker/SessionTracker.ts

@@ -12,6 +12,7 @@
  */
 import { Logger } from '@aws-amplify/core';
 import { BaseTracker } from './BaseTracker';
+import { PageViewTracker } from './PageViewTracker';
 import { Session } from './Session';
 import { BrowserInfo } from '../browser';
 import { Event } from '../provider';
@@ -103,6 +104,7 @@ export class SessionTracker extends BaseTracker {
 	}
 
 	recordUserEngagement(isImmediate: boolean) {
+		PageViewTracker.updateIdleDuration();
 		this.provider.pageViewTracker.recordUserEngagement(isImmediate);
 	}
 

test/tracker/SessionTracker.test.ts

@@ -397,6 +397,16 @@ describe('SessionTracker test', () => {
 		expect(clearFailedEventsMock).not.toBeCalled();
 	});
 
+	test('test hide page will update lastActiveTimestamp', async () => {
+		sessionTracker.setUp();
+		const startTimestamp = PageViewTracker.lastActiveTimestamp;
+		await sleep(110);
+		hidePage();
+		expect(
+			PageViewTracker.lastActiveTimestamp - startTimestamp > 100
+		).toBeTruthy();
+	});
+
 	function hidePage() {
 		Object.defineProperty(window.document, 'hidden', {
 			writable: true,