Modern Web Testing with Vitest and Jest: From Fundamentals to Mastery
- Description
- Curriculum
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In today’s fast-paced development environments, reliable and maintainable testing is critical to delivering high-quality web applications. This hands-on course equips you with a deep understanding of modern testing practices using two of the most powerful and popular JavaScript testing frameworks: Jest and Vitest.
You’ll start with the foundations of unit testing, test runners, and assertions, gradually advancing into mocking strategies, snapshot testing, and test-driven development (TDD). The course provides practical insight into how testing fits into real-world workflows and CI/CD pipelines.
A significant portion of the course is dedicated to writing robust tests for TypeScript projects, ensuring type safety and static analysis. You’ll also explore testing modern frontend features, such as React/Vue components, hooks, stores, and even complex side effects like API calls and timers.
You’ll gain clarity on when and how to use Vitest vs Jest, including differences in performance, configuration, and tooling integration—particularly within Vite-powered applications.
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By the end of the course, you’ll be equipped with the knowledge and confidence to build, maintain, and scale a test suite for any modern web application—whether it’s a solo project or a large, collaborative codebase.
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1
Why Testing Matters in Web DevelopmentTypes of tests: unit, integration, end-to-end. Benefits of TDD
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2
Introduction to Jest and Vitest
Compare syntax, performance, ecosystem compatibility, and philosophy
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3
Setting Up a Testing Environment
Install Jest and Vitest in JS and TS projects. Configuration best practices
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4
Writing Your First Unit Test
Basic assertions, test lifecycle, test structure
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5
The Jest API and CLI
describe, test, expect, watch mode, and coverage reports
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6
Mocks and Spies in Jest
Manual mocks, auto mocks, spying on methods, and restoring behavior
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7
Testing Asynchronous Code with Jest
Callbacks, promises, async/await, and fake timers.
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8
Snapshot Testing with Jest
When to use, updating snapshots, and anti-patterns
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9
Why Vitest? Fast Testing for Vite Projects
Instant startup, Vite-native, browser-like environment.
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10
Migrating from Jest to Vitest
Replace matchers, config equivalence, Vite plugin setup.
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11
Using Vitest with Vue, React, and Svelte
Component test examples using @testing-library and jsdom.
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12
Vitest Advanced Features
Coverage, mocking modules, test isolation, vi.fn() vs jest.fn()
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13
Testing DOM with Testing Library
React Testing Library, Vue Testing Library basics.
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14
Mocking APIs with MSW (Mock Service Worker)
Simulate backend behavior without changing tests for prod/dev.
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15
Testing State, Props, and Hooks (React)
Unit test custom hooks, simulate user interactions.
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16
Debugging Failing Tests
Logs, DOM snapshots, tracing coverage, flaky tests.
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17
Enforcing Coverage and Thresholds
Measure file, branch, and function coverage with Jest/Vitest.
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18
Automating Tests with GitHub Actions / GitLab CI
Write CI pipelines for test automation and badge generation.
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19
Test Reporting and Artifacts
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JUnit output, HTML reports, annotating test results in CI.
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20
Test a Full-Feature Frontend App
Unit Testing
Integration Testing
Snapshot Testing
Mocking (APIs, modules, timers)
TDD (Test-Driven Development)
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Jest & Vitest fundamentals: test runners, matchers, setup
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Writing unit, integration, and snapshot tests
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Testing TypeScript projects with proper type coverage
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Mocking APIs, modules, timers, and dependencies
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Comparing and configuring Jest vs Vitest
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Best practices for test architecture and CI integration
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Comfortable with JavaScript or TypeScript
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Basic understanding of frontend frameworks (React, Vue, etc.)
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Familiarity with npm and project setup
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Frontend developers using React, Vue, or Vanilla JS/TS
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Engineers new to automated testing
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Teams looking to adopt or standardize testing tools
