Dashboard Library Review2134 Progress Certificates

Computer Science Foundations

Programming Languages

JavaScript Fundamentals0/24

Core CS Theory

Data structures & algorithms0/23

OOP & design patterns0/23

Functional Programming Concepts0/20

Operating Systems Fundamentals0/20

Engineering Practice

Software Engineering Fundamentals0/20

Networking Fundamentals0/20

Linux & the Command Line0/20

Frontend Engineering

React & Next.js0/18

CSS & Modern Styling0/18

UI/UX for Developers0/12

Mobile Development0/12

Backend Engineering

Core Backend

Node.js & Backend JavaScript0/18

Databases & SQL0/16

Engineering Practice

Git & Version Control0/14

Testing & QA0/18

Security

Cryptography Fundamentals0/12

Auth, Authorization & Multi-Tenancy0/17

Web Security Fundamentals0/18

Application Security & Secure Coding0/12

Cloud, Infrastructure & DevOps

Cloud Platforms

Cloud Computing & Infrastructure0/19

Containers & Orchestration

Docker & Containers0/12

Delivery & Operations

CI/CD & Deployment Pipelines0/12

Observability & Monitoring0/12

Deployment Platforms

Domain Names, DNS & Subdomains0/12

Systems & Architecture

System design & architecture0/18

Distributed Systems Fundamentals0/12

Message Queues & Event-Driven Architecture0/12

Caching Strategies0/12

AI & Machine Learning

AI & ML Fundamentals0/12

AI Agents & LLM Integration0/17

Platform & Product Integrations

WhatsApp & Meta Platform Integrations0/19

Payments & Financial Systems0/12

Process, Career & Delivery

Agile & Project Management0/14

Interviewing & Career Growth0/12

Built by Mohamed Salem

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Dashboard Library Review2134 Progress Certs

Testing & QA

What actually makes a test worth having — the AAA pattern, test doubles used correctly instead of over-mocked, the pyramid's real shape, and the CI habits that keep a suite fast and trusted instead of ignored.

18 lessons

Study 50 cards for this domain

Beginner

Why we test — the cost of a bug found late vs. found nowBeginner3 min read·Not started Unit tests — what 'unit' actually meansBeginner3 min read·Not started Arrange, Act, Assert — the shape of every good testBeginner3 min read·Not started Assertions and matchers — what a good assertion actually checksBeginner3 min read·Not started

Intermediate

Test doubles: mocks, stubs, fakes, and spiesIntermediate4 min read·Not started Over-mocking — when a test stops testing your codeIntermediate3 min read·Not started Integration tests — what they catch that unit tests can'tIntermediate3 min read·Not started Test coverage — what percentage-covered actually tells you (and doesn't)Intermediate3 min read·Not started Flaky tests — root causes and fixesIntermediate4 min read·Not started Testing async code — promises, timers, and race conditions in testsIntermediate3 min read·Not started Snapshot testing — what it's good for and its real failure modeIntermediate3 min read·Not started Testing React components — render, query, interact, assertIntermediate3 min read·Not started

Advanced

End-to-end tests — a real browser, a real backend, and why they're slowAdvanced3 min read·Not started The test pyramid — why it exists and when to break itAdvanced3 min read·Not started Test-driven development — red, green, refactorAdvanced3 min read·Not started Testing APIs: fixtures, test databases, and contract testsAdvanced3 min read·Not started CI test suites: parallelization, flaky-test quarantine, and fast feedbackAdvanced3 min read·Not started Real testing bugs and anti-patterns — a field referenceAdvanced4 min read·Not started