How do you test code that uses CompletableFuture?

Testing code that uses CompletableFuture in Java can be challenging due to its asynchronous nature. However, with the right techniques and tools, you can effectively verify that your code behaves as expected. This guide outlines some common strategies for testing code that relies on CompletableFuture.

Example of Testing CompletableFuture


        import java.util.concurrent.CompletableFuture;
        import java.util.concurrent.ExecutionException;

        public class CompletableFutureExample {
            public CompletableFuture fetchData() {
                return CompletableFuture.supplyAsync(() -> {
                    // Simulate a long-running task
                    try {
                        Thread.sleep(1000); // Simulate delay
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    return "Data Retrieved";
                });
            }

            public static void main(String[] args) throws ExecutionException, InterruptedException {
                CompletableFutureExample example = new CompletableFutureExample();
                CompletableFuture future = example.fetchData();
                
                // Optionally wait for result
                String result = future.get();
                System.out.println(result); // Output: Data Retrieved
            }
        }

How do you test code that uses CompletableFuture?

Example of Testing CompletableFuture

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How do you test code that uses CompletableFuture?

Example of Testing CompletableFuture

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