TESTED BY ME•Mobile QA & Edge Cases•2026

EduScan Mobile Attendance QA

Hardware QR Scanner, Offline Cache & Sync Reliability

Comprehensive quality assurance testing for a student attendance tracking mobile app featuring hardware camera QR scanning, offline caching, and database sync.

Workflows Tested62

Offline Scenarios14

Bugs Logged12

Data Integrity Rate100%

The Engineering Challenge

Field users frequently lost cellular connection in basement lecture halls, causing data collision and duplicate records when reconnecting, plus application crashes upon denying camera permissions.

The QA & Dev Solution

Constructed a 62-workflow mobile test matrix covering offline SQLite persistence, connection drop simulation, low-light camera stress tests, and permission handling.

My Actual Responsibilities

01.Simulated intermittent offline connectivity and validated local cache retention
02.Tested Android hardware camera permissions and low-light QR scanning fallbacks
03.Logged critical crash stack traces with reproduction logs for the mobile dev team
04.Verified duplicate record prevention logic during reconnect sync

Deliverables Produced

Mobile Test Scenarios Suite (62 workflows)

Camera Permission Exception Bug Reports

Offline Sync Data Integrity Matrix

Technologies & Testing Utilities:

Android StudioReal Device TestingPostmanGitExploratory TestingOffline Storage Auditing

Executed Test Scenarios Matrix

All Scenarios Verified

Test ID	Scenario / Condition	Technique	Expected Result	Result
TC-ES-01	QR Scan - Low Light & Damaged Code Scanning	Exploratory / Hardware	Fallback manual ID entry prompt appears without app freeze	PASS
TC-ES-02	Offline Attendance - 50 Records Cached in LocalDB	Offline Persistence	All 50 records saved in cache without memory loss	PASS
TC-ES-03	Reconnection Sync - Prevent Duplicate Student Record	Data Integrity Validation	Sync merges records cleanly without duplicate increments	PASS

BUG-ES-04: App crash when attempting QR scan after user denies camera permissionReporter: Youssef Salah Elbltagi • Software Testing Trainee @ DEPI

Severity: Critical

Priority: P0 - Blocker

Environment: Android 13 / Samsung Galaxy S21 & Pixel 6

Status: Confirmed Defect

Regression: Verified

Steps to Reproduce:

Install application fresh and navigate to attendance screen.
Deny camera permission when Android system modal appears.
Tap 'Scan QR Code' button.

Expected Result:Display friendly in-app banner prompting user to enable camera in system settings.

Actual Result:Application instantly force-closes with an unhandled NullPointerException in CameraProvider.

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