
using Xunit;
namespace ConsoleApp {
    public class ProgramTests {
        [Fact(DisplayName = "SortScores sorts array in ascending order")] 
        public void SortScores_SortsAscending() 
        {
            int[] scores = { 88, 75, 92, 60, 83 };
            Program.SortScores(scores);
            Assert.Equal(new int[] { 60, 75, 83, 88, 92 }, scores);
        }

        [Fact(DisplayName = "SortScores updates array in place")] 
        public void SortScores_UpdatesInPlace() 
        {
            int[] scores = { 100, 99, 98 };
            var refBefore = scores;
            Program.SortScores(scores);
            Assert.True(object.ReferenceEquals(scores, refBefore), "SortScores should update the original array in place");
        }

        [Fact(DisplayName = "SortScores works with duplicate values")] 
        public void SortScores_WorksWithDuplicates() 
        {
            int[] scores = { 70, 85, 70, 92, 70 };
            Program.SortScores(scores);
            Assert.Equal(new int[] { 70, 70, 70, 85, 92 }, scores);
        }

        [Fact(DisplayName = "SortScores works with single-element array")] 
        public void SortScores_SingleElement() 
        {
            int[] scores = { 42 };
            Program.SortScores(scores);
            Assert.Equal(new int[] { 42 }, scores);
        }

        [Fact(DisplayName = "SortScores does not change already sorted array")] 
        public void SortScores_AlreadySorted() 
        {
            int[] scores = { 5, 10, 15, 20 };
            Program.SortScores(scores);
            Assert.Equal(new int[] { 5, 10, 15, 20 }, scores);
        }
    }
}

ProgramTests.cs

Master the essentials and advanced techniques of working with arrays in C#. This course guides you from the basics of declaring and initializing arrays, through practical manipulation, searching, and advanced operations like sorting and matrix calculations. Each section blends engaging theory with real-world themed challenges to ensure a hands-on, beginner-friendly learning experience.

Challenge: Sort Scores

Solution