/**
 * 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.mahout.cf.taste.impl.common;

import org.apache.mahout.cf.taste.impl.TasteTestCase;
import org.junit.Test;

public final class BitSetTest extends TasteTestCase {

  private static final int NUM_BITS = 100;

  @Test
  public void testGetSet() {
    BitSet bitSet = new BitSet(NUM_BITS);
    for (int i = 0; i < NUM_BITS; i++) {
      assertFalse(bitSet.get(i));
    }
    bitSet.set(0);
    bitSet.set(NUM_BITS-1);
    assertTrue(bitSet.get(0));
    assertTrue(bitSet.get(NUM_BITS-1));
  }

  @Test
  public void testBounds() {
    BitSet bitSet = new BitSet(NUM_BITS);
    try {
      bitSet.set(1000);
      fail("Should have thrown exception");
    } catch (ArrayIndexOutOfBoundsException aioobe) {
      // continue
    }
    try {
      bitSet.set(-1);
      fail("Should have thrown exception");
    } catch (ArrayIndexOutOfBoundsException aioobe) {
      // continue
    }
  }

  @Test
  public void testClear() {
    BitSet bitSet = new BitSet(NUM_BITS);
    for (int i = 0; i < NUM_BITS; i++) {
      bitSet.set(i);
    }
    for (int i = 0; i < NUM_BITS; i++) {
      assertTrue(bitSet.get(i));
    }
    bitSet.clear();
    for (int i = 0; i < NUM_BITS; i++) {
      assertFalse(bitSet.get(i));
    }
  }

  @Test
  public void testClone() {
    BitSet bitSet = new BitSet(NUM_BITS);
    bitSet.set(NUM_BITS-1);
    bitSet = bitSet.clone();
    assertTrue(bitSet.get(NUM_BITS-1));
  }

}