
using Xunit;
using System;
using System.Threading.Tasks;
using System.Reflection;

namespace ConsoleApp {
    public class ProgramTests {
        [Fact(DisplayName = "CalculateSumAsync returns Task<int> type")]
        public void CalculateSumAsync_ReturnsTaskOfInt()
        {
            var method = typeof(Program).GetMethod("CalculateSumAsync");
            Assert.NotNull(method);
            Assert.Equal(typeof(Task<int>), method.ReturnType);
        }

        [Fact(DisplayName = "CalculateSumAsync returns correct sum after delay (positive numbers)")]
        public async Task CalculateSumAsync_ReturnsCorrectSum_Positive()
        {
            int result = await Program.CalculateSumAsync(10, 15);
            Assert.Equal(25, result);
        }

        [Fact(DisplayName = "CalculateSumAsync returns correct sum after delay (negative numbers)")]
        public async Task CalculateSumAsync_ReturnsCorrectSum_Negative()
        {
            int result = await Program.CalculateSumAsync(-5, -7);
            Assert.Equal(-12, result);
        }

        [Fact(DisplayName = "CalculateSumAsync returns correct sum after delay (zero values)")]
        public async Task CalculateSumAsync_ReturnsCorrectSum_Zero()
        {
            int result = await Program.CalculateSumAsync(0, 0);
            Assert.Equal(0, result);
        }

        [Fact(DisplayName = "CalculateSumAsync returns correct sum after delay (mixed values)")]
        public async Task CalculateSumAsync_ReturnsCorrectSum_Mixed()
        {
            int result = await Program.CalculateSumAsync(-3, 8);
            Assert.Equal(5, result);
        }
    }
}

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: Async Calculation

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Challenge: Async Calculation

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