matrixwithtest/MatrixProject.Test/MatrixTest.cs

using System.Reflection;

namespace MatrixProject.Test;

public class MatrixTest
{
    [InlineData(10)]
    [InlineData(5)]
    [InlineData(2)]
    [InlineData(3)]
    [Theory]
    public void CheckRowsBeforeInitMatrixWithRows(int size)
    {
        Matrix matrix = new Matrix(size);

        Assert.Equal(size, matrix.Rows);
        Assert.Equal(size, matrix.Columns);

    }

    [Fact]
    public void CheckColumnsBeforeInitMatrix()
    {
        Matrix matrix = new Matrix();

        Assert.Equal(5, matrix.Columns);
    }

    [Theory]
    [MemberData(nameof(testTwoDimArray))]
    public void CheckFillMatrixInDefaultConstructor(int row, int column, int fillNumber, double[,] testArray) {
    
        Matrix matrix = new Matrix(row, column, fillNumber);
        
        Assert.True(EqualsTwoDimArray(testArray, matrix));
    }


    public static TheoryData<int, int,int, double[,]> testTwoDimArray => new () {

         {2, 2, 3, new double[,] { { 3, 3 }, { 3, 3 } } }
    };

    private bool EqualsTwoDimArray(double[,] testMatrix, Matrix matrix) {
        if(testMatrix.GetLength(0) != matrix.Rows || 
            testMatrix.GetLength(1) != matrix.Columns) return false;
        for (int i = 0; i < matrix.Rows; i++)
        {
            for (int j = 0; j < matrix.Columns; j++)
            {
                if (testMatrix[i, j] != matrix[i, j]) return false;
            }
        }  
        return true;
    }
}