/*
    * 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.io.output;
  
  import static org.junit.jupiter.api.Assertions.assertArrayEquals;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertSame;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  import java.util.concurrent.atomic.AtomicBoolean;
  
  import org.apache.commons.lang3.ArrayUtils;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests {@link CloseShieldOutputStream}.
   */
  class ProxyOutputStreamTest {
  
      private ByteArrayOutputStream original;
  
      private ProxyOutputStream proxied;
  
      private final AtomicBoolean hit = new AtomicBoolean();
  
      @BeforeEach
      public void setUp() {
          original = new ByteArrayOutputStream() {
  
              @Override
              public void write(final byte[] ba) {
                  hit.set(true);
                  super.write(ba);
              }
  
              @Override
              public synchronized void write(final int ba) {
                  hit.set(true);
                  super.write(ba);
              }
          };
          proxied = new ProxyOutputStream(original);
      }
  
      @Test
      void testBuilder() throws Exception {
          assertSame(original, new ProxyOutputStream.Builder().setOutputStream(original).get().unwrap());
      }
  
      @SuppressWarnings("resource")
      @Test
      void testSetReference() throws Exception {
          assertFalse(hit.get());
          proxied.setReference(new ByteArrayOutputStream());
          proxied.write('y');
          assertFalse(hit.get());
          assertEquals(0, original.size());
          assertArrayEquals(ArrayUtils.EMPTY_BYTE_ARRAY, original.toByteArray());
      }
  
      @Test
      void testWrite() throws Exception {
          assertFalse(hit.get());
          proxied.write('y');
          assertTrue(hit.get());
          assertEquals(1, original.size());
          assertEquals('y', original.toByteArray()[0]);
      }
  
      @Test
      void testWriteNullArrayProxiesToUnderlying() throws Exception {
          assertFalse(hit.get());
          final byte[] ba = null;
          assertThrows(NullPointerException.class, () -> original.write(ba));
          assertTrue(hit.get());
          assertThrows(NullPointerException.class, () -> proxied.write(ba));
          assertTrue(hit.get());
      }
  }