MatrixExampleTest.java

public class MatrixExampleTest {

    public void testMultiplyMatrices_CorrectMultiplication() {
        int[][] matrix1 = {
            {1, 2},
            {3, 4}
        };
        int[][] matrix2 = {
            {5, 6},
            {7, 8}
        };
        int[][] expected = {
            {19, 22},
            {43, 50}
        };
        int[][] result = MatrixExample.multiplyMatrices(matrix1, matrix2);
        System.out.println(expected == result);
    }

    public void testMultiplyMatrices_IdentityMatrix() {
        int[][] matrix1 = {
            {1, 0},
            {0, 1}
        };
        int[][] matrix2 = {
            {9, 8},
            {7, 6}
        };
        int[][] expected = {
            {9, 8},
            {7, 6}
        };
        int[][] result = MatrixExample.multiplyMatrices(matrix1, matrix2);
        System.out.println(expected == result);
    }

    public void testMultiplyMatrices_RectangularMatrices() {
        int[][] matrix1 = {
            {2, 3, 4},
            {1, 0, 0}
        };
        int[][] matrix2 = {
            {0, 1000},
            {1, 100},
            {0, 10}
        };
        int[][] expected = {
            {3, 2340},
            {0, 1000}
        };
        int[][] result = MatrixExample.multiplyMatrices(matrix1, matrix2);
        System.out.println(expected == result);
    }


    public void testGenerateRandomMatrix_SizeAndRange() {
        int numRows = 5;
        int numCols = 4;
        int[][] matrix = MatrixExample.generateRandomMatrix(numRows, numCols);
        System.out.println(numRows == matrix.length);
        for (int[] row : matrix) {
            System.out.println(numCols == row.length);
            for (int val : row) {
                System.out.println(val >= 0 && val < 100);
            }
        }
    }

    public void testGenerateRandomMatrix_DifferentSizes() {
        int[][] matrix = MatrixExample.generateRandomMatrix(1, 1);
        System.out.println(matrix[0][0]);

        matrix = MatrixExample.generateRandomMatrix(3, 2);
        System.out.println(matrix.toString());
    }

    public void testGenerateRandomMatrix_ZeroSize() {
        int[][] matrix = MatrixExample.generateRandomMatrix(0, 0);
        System.out.println(matrix.length);
    }
}