/*
    * 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.commons.rng.core.source32;
  
  import org.apache.commons.rng.core.RandomAssert;
  import org.junit.jupiter.api.Test;
  
  class XoRoShiRo64StarTest {
      /** The size of the array seed. */
      private static final int SEED_SIZE = 2;
  
      @Test
      void testReferenceCode() {
          /*
           * Data from running the executable compiled from the author's C code:
           *   http://xoshiro.di.unimi.it/xoroshiro64star.c
           */
          final int[] seed = {
              0x012de1ba, 0xa5a818b8,
          };
  
          final int[] expectedSequence = {
              0xd72accde, 0x29cbd26c, 0xa00fd44a, 0xa4d612c8,
              0xf9c7572b, 0xce94c084, 0x47a3d7ee, 0xb64aa982,
              0x67a9b2a4, 0x0c3d61a8, 0x8f70f7fa, 0xd1edbd63,
              0xac954b3a, 0xd7fe941e, 0xaa38e658, 0x019ecf61,
              0xcded7d7c, 0xd6588891, 0x4414454a, 0xb3c3a124,
              0x4a16fcfe, 0x3fb393c2, 0x4d8d14d6, 0x3a02c906,
              0x0c82f080, 0x174186c4, 0x1199966b, 0x12b83d6a,
              0xe697999e, 0x9df4d2f4, 0x5a5a0879, 0xc44ad6b4,
              0x96a9adc3, 0x4603c20f, 0x3171ca57, 0x66e349c9,
              0xa77dba19, 0xbe4f279d, 0xf5cd3402, 0x1962933d,
          };
  
          RandomAssert.assertEquals(expectedSequence, new XoRoShiRo64Star(seed));
      }
  
      @Test
      void testConstructorWithZeroSeedIsNonFunctional() {
          RandomAssert.assertNextIntZeroOutput(new XoRoShiRo64Star(new int[SEED_SIZE]), 2 * SEED_SIZE);
      }
  
      @Test
      void testConstructorWithSingleBitSeedIsFunctional() {
          RandomAssert.assertIntArrayConstructorWithSingleBitSeedIsFunctional(XoRoShiRo64Star.class, SEED_SIZE);
      }
  
      @Test
      void testConstructorWithoutFullLengthSeed() {
          // Hit the case when the input seed is self-seeded when not full length
          RandomAssert.assertNextLongNonZeroOutput(new XoRoShiRo64Star(new int[] {0x012de1ba}),
                  SEED_SIZE, SEED_SIZE);
      }
  
      @Test
      void testElementConstructor() {
          final int[] seed = {
              0x012de1ba, 0xa5a818b8,
          };
          final XoRoShiRo64Star rng1 = new XoRoShiRo64Star(seed);
          final XoRoShiRo64Star rng2 = new XoRoShiRo64Star(seed[0], seed[1]);
          RandomAssert.assertNextIntEquals(seed.length * 2, rng1, rng2);
      }
  }