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Foundation: Core Principles of Unit Testing for Production Readiness

Understanding Units of Work, Entry and Exit Points, and Test Scope

Characteristics of a Good Unit Test and the Role of Test Doubles

Practical Strategy: Designing and Implementing Unit Testing Before Production

Designing a Practical Unit Testing Strategy for a New or Existing Codebase

Implementing Test Doubles and Managing External Boundaries

Hands-On: From First Test to Pre-Production Readiness

A Test from Scratch and Building a Maintainable Test Suite

Pre-Production Checklist: Quality Gates and CI/CD Integration

Knowledge Check: Quizzes

Quiz: Units of Work and Test Scope

Quiz: Entry and Exit Points, and Assertions

Quiz: Characteristics of a Good Unit Test

Quiz: Test Doubles and External Boundaries

Quiz: Strategy and CI Quality Gates

Final Feedback

Course Survey: Readiness and Confidence in Establishing Unit Testing

Unit Testing Foundations: Strategy, Principles, and Practical Implementation is a hands-on course that shows you how to design, write, and scale unit tests that are fast, deterministic, and production-ready. You’ll learn what a true unit of work is, how to identify entry and exit points in real application code, and how to assert outcomes without coupling tests to implementation details. We’ll demystify the testing pyramid, clarify the boundaries between unit and integration tests, and give you a practical checklist to evaluate every test you write. Beyond fundamentals, the course guides you through a step-by-step strategy to introduce or improve unit testing in any codebase—new or legacy. You’ll choose the right frameworks and tools for your ecosystem, adopt conventions like AAA and clear naming, and implement test doubles (dummy, stub, spy, mock, fake) to isolate code from external systems such as databases, time, filesystem, and network. You’ll practice building maintainable suites, preventing flakiness with deterministic time and data, and integrating tests into CI/CD with meaningful quality gates like mutation score, runtime budgets, and zero-flake policies. By the end, you’ll have the mindset, patterns, and workflows to enforce quality on new code, protect critical paths, and ship with confidence.

Topic 1 - Unit Testing Foundations: Strategy, Principles, and Practical Implementation

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            <p>High-quality software demands tests that are fast, reliable, and strategically focused on the right scope. Unit Testing Foundations: Strategy, Principles, and Practical Implementation equips you to design and maintain a unit testing practice that stands up to production pressures. Beginning with first principles, you will define units of work, identify entry and exit points, and map exit types to the correct assertions—state or behavior—so your tests target what truly matters. You will learn to distinguish unit tests from integration tests with crisp scope boundaries, and apply a pragmatic checklist—fast, isolated, deterministic, readable—to evaluate test effectiveness. The course also clarifies what makes tests valuable over time: clarity, stability, low maintenance cost, and high defect detection rate.</p>

<p>Beyond principles, the course provides a concrete strategy for introducing and scaling unit testing in real projects. You will set meaningful goals and metrics—treating coverage as guidance rather than a target—while tracking mutation score, flakiness, and runtime budgets. You will choose fit-for-purpose tools (xUnit runners, assertion libraries, mocking frameworks), define conventions (AAA pattern, naming, folder structure, builders/fixtures), and align with the testing pyramid to decide what belongs in unit vs. integration vs. end-to-end layers. The modules on test doubles show how and when to use dummies, stubs, spies, mocks, and fakes to isolate code from databases, networks, time, randomness, and the filesystem—managing boundaries without over-mocking and handling async deterministically. Hands-on lessons take you from writing a first test to refactoring a maintainable suite, integrating tests into CI with parallelization and caching, and enforcing pre-production quality gates such as passing suites, minimum mutation scores, zero flakiness, and acceptable runtime. Quizzes reinforce core concepts, and a final survey helps assess readiness to establish a robust, production-grade unit testing discipline.</p>
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