unit-test-scheduled-async
Test @Scheduled and @Async methods directly without waiting for actual execution.
- Call async and scheduled methods directly in tests instead of relying on Spring's async executor or scheduling intervals
- Use
CompletableFuture.get()with explicit timeouts to wait for async results, andAwaitility.await()for polling-based assertions on state changes - Mock dependencies that async methods call, then verify interactions after completion using Mockito
- Test exception handling by catching
ExecutionExceptionfromCompletableFuture.get()and verifying the underlying cause - Requires JUnit 5, Mockito, Awaitility, and AssertJ; avoid testing actual cron timing or thread pool behavior
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
@Scheduledmethod logic - Testing
@Asyncmethod behavior - Verifying
CompletableFutureresults - 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
- Call
@Asyncmethods directly — bypass Spring's async proxy; the annotation is irrelevant in unit tests
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