unit-test-scheduled-async SKILL.md skillA

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SKILL.md skill
Repository
giuseppe-trisciuoglio/developer-kit
Path
plugins/developer-kit-java/skills/unit-test-scheduled-async/SKILL.md
Versions recorded
5
Latest version
git:20260324.a02e282, committed Mar 24, 2026
First version recorded
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Size
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Repository stars
367
License
MIT

Provides patterns for unit testing Spring `@Scheduled` and `@Async` methods using JUnit 5, CompletableFuture, Awaitility, and Mockito. Covers mocking task execution and timing, verifying execution counts, testing cron expressions, validating retry behavior, and simulating thread pool behavior. Use when testing background tasks, cron jobs, periodic execution, scheduled tasks, or thread pool behavior.

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What the file says

# Unit Testing `@Scheduled` and `@Async` Methods

## Overview

Patterns for unit testing Spring `@Scheduled` and `@Async` methods with JUnit 5. Test `CompletableFuture` results, use Awaitility for race conditions, mock scheduled task execution, and validate error handling — without waiting for real scheduling intervals.

## When to Use

- Testing `@Scheduled` method logic
- Testing `@Async` method behavior
- Verifying `CompletableFuture` results
- Testing async error handling
- Testing cron expression logic without waiting for actual scheduling
- Validating thread pool behavior and execution counts
- Testing background task logic in isolation

## Instructions

1. **Call `@Async` methods directly** — bypass Spring's async proxy; the annotation is irrelevant in unit tests
2. **Mock dependencies** with `@Mock` and `@InjectMocks` (Mockito)
3. **Wait for completion** — use `CompletableFuture.get(timeout, unit)` or `await().atMost(...).untilAsserted(...)`
4. **Call `@Scheduled` methods directly** — do not wait for cron/fixedRate; the annotation is ignored in unit tests
5. **Test exception paths** — verify `ExecutionException` wrapping on `CompletableFuture.get()`
…

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The registry has recorded 5 versions of this file, between Feb 7, 2026 and Mar 24, 2026, about one every 11 days.

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git:20260324.a02e282 latest2026-03-24 a02e282 5,851 BA view · diff
git:20260316.91dc3c42026-03-16 91dc3c4 13,214 BA view · diff
git:20260223.c6d4db12026-02-23 c6d4db1 13,172 BA view · diff
v1.0.12026-02-08 147afce 13,271 BA view · diff
v1.0.12026-02-07 1a732c7 11,482 BA view

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Source

GitHub

giuseppe-trisciuoglio/developer-kit · 367 stars · license MIT · pushed 2026-09-10 · branch main

API

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