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Asynchronous tests are used to verify code that runs in a non-blocking mode, for example, using threads, CompletableFuture, reactive libraries.

The experience includes:

• Writing tests that wait for asynchronous operations to complete using wait mechanisms (e.g., CountDownLatch, CompletableFuture.get(), Awaitility).
• Using special libraries for asynchronous testing that allow setting timeouts and completion conditions.
• Verifying the correct handling of callbacks, events, and exceptions in asynchronous code.

Example with Awaitility:

import static org.awaitility.Awaitility.await;
import java.util.concurrent.TimeUnit;

// Testing an asynchronous method
await().atMost(5, TimeUnit.SECONDS).until(() -> asyncOperation.isDone());
assertTrue(asyncOperation.getResult().equals(expected));