Our QA Testing Methodology

Quality assurance is not an afterthought at Terra Connect — it is woven into every stage of our development process. Our comprehensive QA testing methodology combines the precision of manual exploratory testing with the efficiency and repeatability of automated test suites to deliver software that performs flawlessly under real-world conditions.

As a leading software testing company in the UK, we follow a structured testing strategy that begins during the design phase and continues well beyond launch. Every user story includes clearly defined acceptance criteria, and every feature is validated against those criteria through multiple layers of testing before it is considered complete.

Our QA engineers work alongside our developers throughout the sprint, not in isolation at the end. This shift-left testing approach means defects are caught when they are cheapest to fix — during development, not after deployment. We maintain detailed test plans, comprehensive test case repositories, and automated regression suites that grow with your application.

Shift-Left Testing — QA engineers are embedded in the development team from day one, catching defects early when they are simplest and least expensive to resolve.
Risk-Based Test Planning — we prioritise testing effort on the features and workflows that matter most to your business and your users.
Continuous Testing — automated tests run on every code commit, providing immediate feedback on whether changes have introduced regressions.
Comprehensive Documentation — detailed test plans, test cases, and defect reports provide full traceability and transparency throughout the testing process.

Types of Testing We Perform

Delivering reliable software requires multiple layers of testing, each serving a distinct purpose. Our quality assurance services in London encompass every type of testing needed to ensure your application works correctly at every level — from individual functions to complete user journeys.

We design our testing strategy as a pyramid: a broad foundation of fast unit tests, a middle layer of integration tests that verify component interactions, and a focused set of end-to-end tests that validate complete user workflows. This approach provides maximum coverage with optimal execution speed, enabling rapid feedback without sacrificing thoroughness.

1

Unit Testing

Individual functions and components are tested in isolation to verify they produce correct outputs for given inputs. We aim for 80%+ code coverage on all critical modules.

2

Integration Testing

We verify that different modules, services, and APIs work correctly together, testing data flow between components and external system interactions.

3

End-to-End Testing

Complete user journeys are simulated from start to finish using tools like Cypress and Playwright, ensuring the full application works as users expect.

4

Regression Testing

Automated regression suites run after every change to ensure new features and fixes have not broken existing functionality elsewhere in the application.

Testing at Every Layer

Our multi-layered testing approach catches different categories of defects at each level, providing comprehensive coverage that single-layer testing simply cannot achieve.

Automated Testing Frameworks

Manual testing alone cannot keep pace with modern agile development. Our automated testing services leverage industry-leading frameworks and tools to execute thousands of test cases in minutes, providing rapid and reliable feedback on every code change.

We select the right testing tools for each project based on the technology stack, application architecture, and testing requirements. Our QA engineers are proficient across a wide range of automated testing frameworks, allowing us to build test suites that are maintainable, fast, and comprehensive.

Automated tests are integrated directly into our CI/CD pipeline, running automatically on every pull request and deployment. Failed tests block the deployment pipeline, ensuring that defective code never reaches staging or production environments. We also generate detailed test reports with screenshots, videos, and trace logs to make debugging straightforward when issues arise.

Jest and Vitest — fast, reliable unit and integration testing for JavaScript and TypeScript applications with snapshot testing and mocking capabilities.
Cypress and Playwright — modern end-to-end testing frameworks that simulate real user interactions in actual browsers with visual regression support.
React Testing Library — component-level testing that validates user-facing behaviour rather than implementation details, producing more resilient tests.
Supertest and Postman — API testing tools that validate endpoint responses, error handling, authentication, and data integrity across all backend services.
Lighthouse CI — automated performance, accessibility, and SEO audits that run on every build to maintain web quality standards.

Performance and Security Testing

A feature that works correctly but loads slowly or has security vulnerabilities is not truly ready for production. Our performance testing services verify that your application can handle real-world traffic loads with acceptable response times, while our security testing in London identifies and addresses vulnerabilities before they can be exploited.

We conduct load testing to simulate hundreds or thousands of concurrent users, measuring response times, throughput, and resource utilisation under stress. This testing reveals bottlenecks in your application architecture — whether in database queries, API responses, or front-end rendering — so we can optimise performance before launch.

Our security testing process includes automated vulnerability scanning, dependency auditing, and manual penetration testing of critical workflows. We test for the OWASP Top 10 vulnerabilities, including SQL injection, cross-site scripting (XSS), broken authentication, and insecure data exposure. Every security finding is documented with severity ratings and remediation guidance.

Load Testing

We simulate realistic traffic patterns to verify your application maintains acceptable performance under expected and peak load conditions.

Stress Testing

We push your application beyond its limits to identify breaking points and ensure graceful degradation rather than catastrophic failure.

Security Scanning

Automated tools scan for known vulnerabilities, outdated dependencies, and common security misconfigurations across your entire stack.

OWASP Top 10 Compliance

Every application we deliver is tested against the OWASP Top 10 security risks, ensuring your software meets industry-recognised security standards and protects your users' data.

Cross-Browser and Cross-Device Testing

Your users access your application from a wide range of devices, browsers, and operating systems. Our cross-browser and cross-device testing ensures a consistent, high-quality experience regardless of how your audience connects. We test across Chrome, Firefox, Safari, and Edge on both desktop and mobile platforms.

We use a combination of real devices and cloud-based testing platforms to validate your application across dozens of device and browser combinations. Responsive layouts are tested at multiple breakpoints to verify that content reflows correctly, touch interactions work smoothly on mobile, and all functionality remains accessible on smaller screens.

Accessibility testing is also a core part of our QA process. We validate conformance with WCAG 2.1 guidelines, testing keyboard navigation, screen reader compatibility, colour contrast ratios, and focus management. Every user deserves a seamless experience, and our testing ensures your application delivers exactly that.

Real Device Testing — we test on physical iPhones, Android devices, tablets, and desktops to catch issues that emulators might miss.
Browser Compatibility — comprehensive testing across Chrome, Firefox, Safari, Edge, and their mobile variants ensures consistent functionality everywhere.
Responsive Design Validation — layouts are tested at all standard breakpoints and custom sizes to verify fluid, adaptive behaviour.
Accessibility Auditing — automated and manual accessibility testing against WCAG 2.1 AA standards ensures inclusivity for all users.

Bug Tracking and Resolution Workflow

When our QA team identifies a defect, it enters a structured bug tracking and resolution workflow designed for speed and accountability. Every bug is documented with detailed reproduction steps, expected versus actual behaviour, severity classification, screenshots, and environment information — giving developers everything they need to resolve the issue efficiently.

We categorise defects by severity — critical, major, minor, and cosmetic — and by priority based on business impact. Critical and major defects block the current sprint release and are addressed immediately. Minor and cosmetic issues are tracked and scheduled into upcoming sprints based on priority.

Our QA engineers verify every fix through targeted retesting and then run the full regression suite to confirm the fix has not introduced new issues elsewhere. This closed-loop process ensures that resolved bugs stay resolved, and your application's quality improves steadily with each release cycle.

1

Identify and Document

Defects are logged with detailed reproduction steps, screenshots, severity ratings, and environment details for efficient developer handoff.

2

Prioritise and Assign

Bugs are triaged based on severity and business impact, then assigned to the appropriate developer with clear resolution deadlines.

3

Fix and Verify

Developers resolve the issue, QA engineers verify the fix through targeted retesting, and the full regression suite confirms no new regressions.

Demand Quality in Every Release

Partner with Terra Connect for rigorous quality assurance testing that gives you confidence in every deployment. Your users deserve software that works flawlessly.

Conduct Quality Assurance Testing