/*
    * 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
    *
    *      https://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.lang3.function;
  
  import static org.apache.commons.lang3.LangAssertions.assertNullPointerException;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  import java.util.concurrent.atomic.AtomicInteger;
  
  import org.apache.commons.lang3.AbstractLangTest;
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests {@link ByteConsumer}.
   */
  class ByteConsumerTest extends AbstractLangTest {
  
      private static final byte B0 = (byte) 0;
      private static final byte B1 = (byte) 1;
  
      private ByteConsumer accept(final ByteConsumer consumer, final byte expected) {
          consumer.accept(expected);
          return consumer;
      }
  
      @Test
      void testAccept() {
          final AtomicInteger ref = new AtomicInteger();
          accept(v -> ref.lazySet(v), B1);
          assertEquals(1, ref.get());
          accept(v -> ref.lazySet(v), B0);
          assertEquals(0, ref.get());
      }
  
      @Test
      void testAndThen() throws Throwable {
          final ByteConsumer nop = ByteConsumer.nop();
          nop.andThen(nop);
          // Documented in Javadoc edge-case.
          assertNullPointerException(() -> nop.andThen(null));
  
          final AtomicInteger ref1 = new AtomicInteger();
          final AtomicInteger ref2 = new AtomicInteger();
  
          final ByteConsumer bc = ref1::lazySet;
          final ByteConsumer composite = bc.andThen(ref2::lazySet);
  
          composite.accept(B1);
          assertEquals(1, ref1.get());
          assertEquals(1, ref2.get());
  
          composite.accept(B0);
          assertEquals(0, ref1.get());
          assertEquals(0, ref2.get());
  
          // Check order
          final ByteConsumer bad = value -> {
              throw new IllegalStateException();
          };
          final ByteConsumer badComposite = bad.andThen(ref2::lazySet);
  
          Assertions.assertThrows(IllegalStateException.class, () -> badComposite.accept(B1));
          assertEquals(0, ref2.get(), "Second consumer should not be invoked");
      }
  
  }