How do I handle exceptions in CompletableFuture tests?

Combine AssertJ's assertThatThrownBy with CompletableFuture.get() to catch and verify ExecutionException and its underlying cause.

How do I test @Scheduled methods without waiting for the cron trigger?

You should call the scheduled method directly in your unit test and mock any dependencies to verify logic in isolation, rather than waiting for the Spring scheduler to fire.

Why use Awaitility instead of Thread.sleep() in tests?

Awaitility provides a non-blocking, fluent API that polls for specific conditions, making tests significantly faster and less flaky than using fixed sleep intervals.

Can I test the actual cron schedule configuration?

Unit tests focus on the logic inside the method. To test cron expressions, you can use integration tests or manually verify the method execution count in a mock environment.

What is the best way to test @Async methods that return void?

Use Awaitility to poll for state changes or use Mockito to verify interactions with dependencies within a specified timeout period.

Async and Scheduled Unit Testing

Name: Async and Scheduled Unit Testing
Author: pur3v4d3r

bypur3v4d3r

•

보안 및 테스팅

Simplifies unit testing for Spring @Async and @Scheduled tasks using JUnit 5, Mockito, and Awaitility.

소개

This skill provides specialized implementation patterns and best practices for testing asynchronous operations and scheduled jobs in Java Spring applications. It enables developers to verify complex background logic, handle CompletableFuture results, and validate concurrency error handling without the performance overhead of actual thread scheduling or real-time waiting. By leveraging industry-standard tools like JUnit 5, Mockito, and Awaitility, it ensures that your non-blocking and time-based code remains robust, maintainable, and fast-executing.

주요 기능

Testing patterns for Spring @Async and @Scheduled annotations
Integration with Awaitility for fluent asynchronous assertions
Validation patterns for CompletableFuture results and exceptions
1 GitHub stars
Techniques for mocking dependencies in concurrent execution contexts
Fast-running test configurations that bypass actual job schedulers

사용 사례

Validating business logic within hourly or daily cron jobs
Verifying error propagation and fallbacks in multi-threaded workflows
Testing non-blocking email notifications or background data processing

소개

주요 기능

Testing patterns for Spring @Async and @Scheduled annotations
Integration with Awaitility for fluent asynchronous assertions
Validation patterns for CompletableFuture results and exceptions
1 GitHub stars
Techniques for mocking dependencies in concurrent execution contexts
Fast-running test configurations that bypass actual job schedulers

사용 사례

Validating business logic within hourly or daily cron jobs
Verifying error propagation and fallbacks in multi-threaded workflows
Testing non-blocking email notifications or background data processing