@Test
public void testIsEmpty() {

    DynamicCompositeByteBuf compositeByteBuf = new DynamicCompositeByteBuf();
    Assert.assertTrue(compositeByteBuf.isEmpty() == true);
    ByteBuf buf1 = Unpooled.wrappedBuffer("hello1".getBytes());
    DynamicCompositeByteBuf compositeByteBuf2 = new DynamicCompositeByteBuf(buf1);
    Assert.assertTrue(compositeByteBuf2.isEmpty() == false);
}