BigDecimal zero equals showcase

BigDecimalZeroEequalsTest.java

    @Test
    public void test() throws Exception {

        final BigDecimal Z0 = new BigDecimal("0");
        final BigDecimal Z1 = new BigDecimal("0.0");
        final BigDecimal Z2 = new BigDecimal("0.00");
        final BigDecimal Z5 = ZERO.setScale(5);

        assertFalse(Z0.equals(Z1));
        assertFalse(Z1.equals(Z2));
        assertFalse(Z5.equals(Z2));

        assertTrue(Z0.equals(ZERO));
        assertFalse(Z1.equals(ZERO));
        assertFalse(Z2.equals(ZERO));
        assertFalse(Z5.equals(ZERO));


        assertTrue(ZERO.signum() == 0);
        assertTrue(Z0.signum() == 0);
        assertTrue(Z1.signum() == 0);
        assertTrue(Z2.signum() == 0);
        assertTrue(Z5.signum() == 0);

        assertTrue(ZERO.compareTo(ZERO) == 0);
        assertTrue(Z0.compareTo(ZERO) == 0);
        assertTrue(Z1.compareTo(ZERO) == 0);
        assertTrue(Z2.compareTo(ZERO) == 0);
        assertTrue(Z5.compareTo(ZERO) == 0);

        assertTrue(Numbers.isZero(ZERO));
        assertTrue(Numbers.isZero(Z0));
        assertTrue(Numbers.isZero(Z1));
        assertTrue(Numbers.isZero(Z2));
        assertTrue(Numbers.isZero(Z5));
    }