### Question:
Numeric { public static boolean isIntegerValue(BigDecimal value) { return value.signum() == 0 || value.scale() <= 0 || value.stripTrailingZeros().scale() <= 0; } private  Numeric(); static String encodeQuantity(BigInteger value); static BigInteger decodeQuantity(String value); static String cleanHexPrefix(String input); static String prependHexPrefix(String input); static boolean containsHexPrefix(String input); static BigInteger toBigInt(byte[] value, int offset, int length); static BigInteger toBigInt(byte[] value); static BigInteger toBigInt(String hexValue); static BigInteger toBigIntNoPrefix(String hexValue); static String toHexStringWithPrefix(BigInteger value); static String toHexStringNoPrefix(BigInteger value); static String toHexStringNoPrefix(byte[] input); static String toHexStringWithPrefixZeroPadded(BigInteger value, int size); static String toHexStringNoPrefixZeroPadded(BigInteger value, int size); static byte[] toBytesPadded(BigInteger value, int length); static String littleEndian(long number); static byte[] hexStringToByteArray(String input); static String toHexString(byte[] input, int offset, int length, boolean withPrefix); static String toHexString(byte[] input); static String toHexString(String input); static byte asByte(int m, int n); static boolean isIntegerValue(BigDecimal value); static boolean isIntegerValue(String value); static List<Byte> intToBytes(int value);  }### Answer:
@Test public void testIsIntegerValue() { Assertions.assertTrue(Numeric.isIntegerValue(BigDecimal.ZERO)); Assertions.assertTrue(Numeric.isIntegerValue(BigDecimal.ZERO)); Assertions.assertTrue(Numeric.isIntegerValue(BigDecimal.valueOf(Long.MAX_VALUE))); Assertions.assertTrue(Numeric.isIntegerValue(BigDecimal.valueOf(Long.MIN_VALUE))); Assertions.assertTrue( Numeric.isIntegerValue( new BigDecimal("9999999999999999999999999999999999999999999999999999999999999999.0"))); Assertions.assertTrue( Numeric.isIntegerValue( new BigDecimal("-9999999999999999999999999999999999999999999999999999999999999999.0"))); Assertions.assertFalse(Numeric.isIntegerValue(BigDecimal.valueOf(0.1))); Assertions.assertFalse(Numeric.isIntegerValue(BigDecimal.valueOf(-0.1))); Assertions.assertFalse(Numeric.isIntegerValue(BigDecimal.valueOf(1.1))); Assertions.assertFalse(Numeric.isIntegerValue(BigDecimal.valueOf(-1.1))); }
@Test public void testIsIntegerValue2() { Assertions.assertTrue(Numeric.isIntegerValue("20")); Assertions.assertTrue(Numeric.isIntegerValue("-20")); Assertions.assertTrue(Numeric.isIntegerValue("0")); Assertions.assertFalse(Numeric.isIntegerValue("0x20")); Assertions.assertFalse(Numeric.isIntegerValue("abc")); Assertions.assertFalse(Numeric.isIntegerValue("#%34")); }