
using Xunit;
using System;
using System.IO;
using System.Threading.Tasks;

namespace ConsoleApp {
    public class ProgramTests {
        [Fact(DisplayName = "Main prints the exception message from ThrowingAsyncMethod")]
        public async Task Main_PrintsExceptionMessage()
        {
            var sw = new StringWriter();
            Console.SetOut(sw);

            await Program.TestMain(new string[0]);

            string output = sw.ToString().Trim();
            Assert.Contains("Error occurred in async method!", output);

            Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = true });
        }

        [Fact(DisplayName = "ThrowingAsyncMethod throws the expected exception")] 
        public async Task ThrowingAsyncMethod_ThrowsException() 
        { 
            var ex = await Assert.ThrowsAsync<Exception>(async () => await Program.ThrowingAsyncMethod());
            Assert.Equal("Error occurred in async method!", ex.Message);
        }
    }
}

ProgramTests.cs

Master asynchronous programming in C# with hands-on practice and engaging explanations. Learn to convert synchronous code to async, process collections concurrently, handle timeouts, and manage errors effectively using async/await.

Learn the basics of async/await in C# and how to convert synchronous code to asynchronous for better performance and responsiveness.

Explore how to use async/await in loops and process collections of data asynchronously for efficient, scalable code.

Master advanced async/await concepts: handling timeouts, managing sequential vs. parallel tasks, and robust error handling.

Challenge: Robust Async Error Handling

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Challenge: Robust Async Error Handling

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