java-tutorials/java-numbers/src/test/java/com/baeldung/maths/BigDecimalImplUnitTest.java

package com.baeldung.maths;

import org.junit.Assert;
import org.junit.Test;

import java.math.BigDecimal;
import java.math.RoundingMode;

public class BigDecimalImplUnitTest {

    @Test
    public void givenBigDecimalNumbers_whenAddedTogether_thenGetExpectedResult() {
        BigDecimal serviceTax = new BigDecimal("56.0084578639");
        serviceTax = serviceTax.setScale(2, RoundingMode.CEILING);

        BigDecimal entertainmentTax = new BigDecimal("23.00689");
        entertainmentTax = entertainmentTax.setScale(2, RoundingMode.FLOOR);

        BigDecimal totalTax = serviceTax.add(entertainmentTax);
        BigDecimal result = BigDecimal.valueOf(79.01);

        Assert.assertEquals(result, totalTax);

    }
}