Vitest 50 Drills: TypeScript Unit Testing from the Ground Up
MP4 | Video: h264, 1920x1080 | Audio: AAC, 44.1 KHz, 2 Ch
Genre: eLearning | Language: English (US) | Duration: 7 h | Size: 1.70 GB
This course contains the use of artificial intelligence.
I can copy Jest's syntax. But I can't explain why it's written that way.
- This course exists to get you out of exactly that state.
Vitest is a test runner that reuses Vite's transform pipeline directly to execute your tests. Once you grasp this single fact, everything connects on one line: why TypeScript runs with zero config, why `vi.mock` takes effect before your imports, why Promises don't resolve under fake timers. This course builds up that "how it works" understanding systematically through 50 hands-on drills.
Learning follows a roadmap of 10 chapters. Chapter 0 nails down Vitest's execution model. Chapter 1 covers the "three levels of equality" (`toBe` / `toEqual` / `toStrictEqual`), asymmetric matchers, and even writing your own custom matchers. Chapter 2 covers data-driven testing with `test.each` / `describe.each` / `test.for`; Chapter 3 covers hook execution order and the dependency graph and scope design of Vitest's fixture mechanism `test.extend`.
Chapter 4 is a full system for mocks. The three-tier reset distinction of `mockClear` / `mockReset` / `mockRestore` that trips up so many learners, and the hoisting behavior of `vi.mock`, are made to click through running code. Chapter 5 conquers async testing end to end: `resolves` / `rejects`, fake timers x Promises, `vi.waitFor`, `test.concurrent`, and `retry` for flaky tests.
From Chapter 6 we turn to real targets. You'll build designs that verify temporary-file I/O, the repository pattern over in-memory SQLite (`node:sqlite`), and HTTP APIs with Hono and zod as "real I/O, but fast and deterministic." Chapter 7's snapshots show how to remove noise with custom serializers; Chapter 8 covers Vitest-only weapons: in-source tests, type tests (`expectTypeOf`), benchmarks (`bench`), and browser mode. The final chapter closes with a coverage-threshold gate, unit/integration separation via `projects`, and a capstone that implements `PriceCalculator` via TDD and builds a mock CI.
Not just becoming able to write tests, but becoming able to design tests. That is the goal of this course.
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