maxResultLength parameter no effect on reading HttpEntity

@Test
public void testMaxResultLengthNoEffect() throws IOException {
    String random = org.apache.commons.lang3.RandomStringUtils.random(5000, true, true);
    byte[] bytes = org.apache.hc.core5.http.io.entity.EntityUtils.toByteArray(
            new org.apache.hc.core5.http.io.entity.StringEntity(random)
            , (int) Math.pow(10, 3));
    String s = new String(bytes);
    Assert.assertEquals(random,s);
}