/*
    * 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.io.build;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  import java.util.Arrays;
  
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests {@link AbstractStreamBuilder}.
   */
  public class AbstractStreamBuilderTest {
  
      public static class Builder extends AbstractStreamBuilder<char[], Builder> {
  
          @Override
          public char[] get() {
              final char[] arr = new char[getBufferSize()];
              Arrays.fill(arr, 'a');
              return arr;
          }
  
      }
  
      private void assertResult(final char[] arr, final int size) {
          assertNotNull(arr);
          assertEquals(size, arr.length);
          for (final char c : arr) {
              assertEquals('a', c);
          }
      }
  
      protected Builder builder() {
          return new Builder();
      }
  
      @Test
      public void testBufferSizeChecker() {
          // sanity
          final Builder builder = builder();
          assertResult(builder.get(), builder.getBufferSize());
          // basic failure
          assertThrows(IllegalArgumentException.class, () -> builder().setBufferSizeMax(2).setBufferSize(3));
          // reset
          assertResult(builder.setBufferSizeMax(2).setBufferSizeMax(0).setBufferSize(3).get(), 3);
          // resize
          assertResult(builder().setBufferSizeMax(2).setBufferSizeChecker(i -> 100).setBufferSize(3).get(), 100);
      }
  }