invyone/backend-spring/src/test/java/com/erp/util/DecimalUtilsTest.java

package com.erp.util;

import org.junit.jupiter.api.Test;

import java.math.BigDecimal;

import static org.junit.jupiter.api.Assertions.*;

class DecimalUtilsTest {

    @Test
    void toBigDecimal_fromString() {
        assertEquals(new BigDecimal("123.45"), DecimalUtils.toBigDecimal("123.45"));
    }

    @Test
    void toBigDecimal_fromNull_returnsZero() {
        assertEquals(BigDecimal.ZERO, DecimalUtils.toBigDecimal(null));
    }

    @Test
    void toBigDecimal_fromInteger() {
        assertEquals(new BigDecimal("100"), DecimalUtils.toBigDecimal(100));
    }

    @Test
    void scale2_roundsHalfUp() {
        BigDecimal result = DecimalUtils.scale2(new BigDecimal("1.235"));
        assertEquals(new BigDecimal("1.24"), result);
    }

    @Test
    void multiply_correctResult() {
        BigDecimal result = DecimalUtils.multiply("10", "3.5");
        assertEquals(new BigDecimal("35.0"), result);
    }

    @Test
    void add_correctResult() {
        BigDecimal result = DecimalUtils.add("10.5", "4.5");
        assertEquals(new BigDecimal("15.0"), result);
    }

    @Test
    void subtract_correctResult() {
        BigDecimal result = DecimalUtils.subtract("20", "7.5");
        assertEquals(new BigDecimal("12.5"), result);
    }
}