/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.lucene.util.quantization;

import java.util.Arrays;
import org.apache.lucene.index.VectorSimilarityFunction;
import org.apache.lucene.tests.util.LuceneTestCase;

public class TestScalarQuantizerNearestByte extends LuceneTestCase {

  public void testJustBelowHalfRoundsDown() {
    ScalarQuantizer quantizer = new ScalarQuantizer(0f, 1f, (byte) 8);
    float[] vector = new float[16];
    Arrays.fill(vector, Float.intBitsToFloat(0x3b008080));
    byte[] dest = new byte[16];
    quantizer.quantize(vector, dest, VectorSimilarityFunction.EUCLIDEAN);
    // 255 * x rounds to 0.49999997f: expected byte 0 (Math.round, default provider), Panama gives 1
    assertEquals(0, dest[0]);
  }
}