
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.

Challenge: Multiply Matrices

解答