/* See LICENSE for licensing and NOTICE for copyright. */
package org.cryptacular.generator.sp80038a;

import java.math.BigInteger;
import org.cryptacular.FailListener;
import org.cryptacular.util.ByteUtil;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Listeners;
import org.testng.annotations.Test;
import static org.assertj.core.api.Assertions.*;

/**
 * Unit test for {@link BigIntegerCounterNonce}.
 *
 * @author  Middleware Services
 */
@Listeners(FailListener.class)
public class BigIntegerCounterNonceTest
{
  @DataProvider(name = "test-data")
  public Object[][] getTestData()
  {
    return new Object[][] {
      new Object[] {1, 8},
      new Object[] {2199023255552L, 16},
    };
  }

  @Test(dataProvider = "test-data")
  public void testGenerate(final long start, final int expectedLength)
    throws Exception
  {
    final BigIntegerCounterNonce nonce = new BigIntegerCounterNonce(
      new BigInteger(ByteUtil.toBytes(start)),
      expectedLength);
    final byte[] value = nonce.generate();
    assertThat(value.length).isEqualTo(expectedLength);
    assertThat(new BigInteger(value)).isEqualTo(new BigInteger(ByteUtil.toBytes(start + 1)));
  }
}
