Java/src/test/java/com/thealgorithms/matrix/MatrixUtilTest.java at master · TheAlgorithms/Java · GitHub

Name: Java/src/test/java/com/thealgorithms/matrix/MatrixUtilTest.java at master · TheAlgorithms/Java · GitHub
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packagecom.thealgorithms.matrix;

importstaticorg.junit.jupiter.api.Assertions.assertTrue;

importcom.thealgorithms.matrix.utils.MatrixUtil;
importjava.math.BigDecimal;
importjava.util.Objects;
importorg.junit.jupiter.api.Test;

classMatrixUtilTest {

@Test
voidadd() {
finalBigDecimal[][] matrix1 = {
 {newBigDecimal(3), BigDecimal.TWO},
 {BigDecimal.ZERO, BigDecimal.ONE},
 };

finalBigDecimal[][] matrix2 = {
 {BigDecimal.ONE, newBigDecimal(3)},
 {BigDecimal.TWO, BigDecimal.ZERO},
 };

finalBigDecimal[][] actual = MatrixUtil.add(matrix1, matrix2).orElseThrow(() -> newAssertionError("Could not compute matrix!"));

finalBigDecimal[][] expected = {
 {newBigDecimal(4), newBigDecimal(5)},
 {BigDecimal.TWO, BigDecimal.ONE},
 };

assertTrue(Objects.deepEquals(actual, expected));
 }
@Test
voidsubtract() {
finalBigDecimal[][] matrix1 = {
 {BigDecimal.ONE, newBigDecimal(4)},
 {newBigDecimal(5), newBigDecimal(6)},
 };

finalBigDecimal[][] matrix2 = {
 {BigDecimal.TWO, BigDecimal.ZERO},
 {newBigDecimal(-2), newBigDecimal(-3)},
 };

finalBigDecimal[][] actual = MatrixUtil.subtract(matrix1, matrix2).orElseThrow(() -> newAssertionError("Could not compute matrix!"));

finalBigDecimal[][] expected = {
 {newBigDecimal(-1), newBigDecimal(4)},
 {newBigDecimal(7), newBigDecimal(9)},
 };

assertTrue(Objects.deepEquals(actual, expected));
 }

@Test
voidmultiply() {

finalBigDecimal[][] matrix1 = {
 {BigDecimal.ONE, BigDecimal.TWO, newBigDecimal(3)},
 {newBigDecimal(4), newBigDecimal(5), newBigDecimal(6)},
 {newBigDecimal(7), newBigDecimal(8), newBigDecimal(9)},
 };

finalBigDecimal[][] matrix2 = {
 {BigDecimal.ONE, BigDecimal.TWO},
 {newBigDecimal(3), newBigDecimal(4)},
 {newBigDecimal(5), newBigDecimal(6)},
 };

finalBigDecimal[][] actual = MatrixUtil.multiply(matrix1, matrix2).orElseThrow(() -> newAssertionError("Could not compute matrix!"));

finalBigDecimal[][] expected = {
 {newBigDecimal(22), newBigDecimal(28)},
 {newBigDecimal(49), newBigDecimal(64)},
 {newBigDecimal(76), newBigDecimal(100)},
 };

assertTrue(Objects.deepEquals(actual, expected));
 }
}