Redux-Saga Testing

Created by Anivar Aravind

An AI agent skill for writing tests for Redux Sagas using redux-saga-test-plan. Works with Jest and Vitest.

The Problem

AI agents often write saga tests that are brittle (asserting exact effect order when it doesn't matter), miss provider setup (causing tests to hit real APIs), or use manual generator stepping when expectSaga would be simpler and more maintainable. The result: tests that break on harmless refactors and pass when they shouldn't.

This Solution

A focused testing skill covering expectSaga (integration), testSaga (unit), providers, matchers, and reducer integration — with 12 anti-patterns showing exactly what goes wrong and how to fix it.

Install

npx skills add anivar/redux-saga-testing -g

Or with full URL:

npx skills add https://github.com/anivar/redux-saga-testing

Baseline

• redux-saga-test-plan ^5.x
• redux-saga ^1.4.2
• Jest or Vitest

What's Inside

Testing Approaches

Approach	Type	Use When
expectSaga	Integration	Default choice — order-independent, async, assertions on effects and state
testSaga	Unit	Effect ordering matters (e.g., must select before call)
runSaga	Manual	Need full store integration or custom middleware

Providers

Provider Type	Purpose
Static providers	Map effect → return value (simple, covers most cases)
Dynamic providers	Custom logic per effect type (conditional mocking)
Partial matchers	matchers.call.fn(apiFn) — match by function regardless of args

Anti-Patterns

12 common testing mistakes with BAD/GOOD code examples:

• Asserting effect order in integration tests
• Missing providers for API calls
• Not awaiting expectSaga (test always passes)
• Testing implementation instead of behavior
• Ignoring error paths and cancellation

Structure

├── SKILL.md                      # Entry point for AI agents
└── references/
    ├── api-reference.md          # Complete expectSaga, testSaga, providers, matchers API
    └── anti-patterns.md          # 12 common testing mistakes to avoid

Ecosystem — Skills by Anivar Aravind

Testing Skills

Skill	What it covers	Install
jest-skill	Jest best practices — mock design, async testing, matchers, timers, snapshots	npx skills add anivar/jest-skill -g
zod-testing	Zod schema testing — safeParse, mock data, property-based	npx skills add anivar/zod-testing -g
msw-skill	MSW 2.0 API mocking — handlers, responses, GraphQL	npx skills add anivar/msw-skill -g

Library & Framework Skills

Skill	What it covers	Install
zod-skill	Zod v4 schema validation, parsing, error handling	npx skills add anivar/zod-skill -g
redux-saga-skill	Redux-Saga effects, fork model, channels, RTK	npx skills add anivar/redux-saga-skill -g
msw-skill	MSW 2.0 handlers, responses, migration	npx skills add anivar/msw-skill -g

Engineering Analysis

Skill	What it covers	Install
contributor-codebase-analyzer	Code analysis, annual reviews, promotion readiness	npx skills add anivar/contributor-codebase-analyzer -g

Author

Anivar Aravind — Building AI agent skills for modern JavaScript/TypeScript development.

License

MIT