
using Xunit;
namespace ConsoleApp {
    public class ProgramTests {
        [Fact(DisplayName = "MultiplyMatrices returns correct dimensions for compatible matrices")]
        public void MultiplyMatrices_ReturnsCorrectDimensions()
        {
            int[,] a = { {1, 2, 3}, {4, 5, 6} };
            int[,] b = { {7, 8}, {9, 10}, {11, 12} };
            int[,] result = Program.MultiplyMatrices(a, b);
            Assert.Equal(2, result.GetLength(0));
            Assert.Equal(2, result.GetLength(1));
        }

        [Fact(DisplayName = "MultiplyMatrices calculates correct product elements")]
        public void MultiplyMatrices_CalculatesCorrectProduct()
        {
            int[,] a = { {1, 2}, {3, 4} };
            int[,] b = { {5, 6}, {7, 8} };
            int[,] expected = { {19, 22}, {43, 50} };
            int[,] result = Program.MultiplyMatrices(a, b);
            for (int i = 0; i < 2; i++)
                for (int j = 0; j < 2; j++)
                    Assert.Equal(expected[i, j], result[i, j]);
        }

        [Fact(DisplayName = "MultiplyMatrices throws exception for incompatible matrices")]
        public void MultiplyMatrices_ThrowsOnIncompatible()
        {
            int[,] a = { {1, 2} };
            int[,] b = { {3, 4}, {5, 6}, {7, 8} };
            var ex = Assert.Throws<ArgumentException>(() => Program.MultiplyMatrices(a, b));
            Assert.Contains("Number of columns in matrixA must match number of rows in matrixB", ex.Message);
        }
    }
}

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.

Start your journey with arrays in C#: learn how to declare, initialize, and access array elements, and tackle your first real-world array challenges.

Dive deeper into arrays by learning how to search for values, filter elements, and perform calculations like finding min, max, and averages.

Advance your skills by learning how to reverse arrays, sort them manually, and understand how arrays are stored and copied in memory.

Explore two-dimensional arrays, learn to perform matrix operations, and tackle real-world challenges involving grids and tables.

Challenge: Multiply Matrices

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Challenge: Multiply Matrices

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