/*
    * 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;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNull;
  
  import java.nio.charset.Charset;
  import java.nio.charset.StandardCharsets;
  import java.util.Set;
  import java.util.SortedMap;
  
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests {@link Charsets}.
   */
  @SuppressWarnings("deprecation") // testing deprecated code
  public class CharsetsTest {
  
      /**
       * For parameterized tests.
       */
      public static final String AVAIL_CHARSETS = "org.apache.commons.io.CharsetsTest#availableCharsetsKeySet";
      /**
       * For parameterized tests.
       */
      public static final String REQUIRED_CHARSETS = "org.apache.commons.io.CharsetsTest#getRequiredCharsetNames";
  
      /**
       * For parameterized tests.
       *
       * @return {@code Charset.availableCharsets().keySet()}.
       */
      public static Set<String> availableCharsetsKeySet() {
          return Charset.availableCharsets().keySet();
      }
  
      /**
       * For parameterized tests.
       *
       * @return {@code Charset.requiredCharsets().keySet()}.
       */
      public static Set<String> getRequiredCharsetNames() {
          return Charsets.requiredCharsets().keySet();
      }
  
      @Test
      public void testIso8859_1() {
          assertEquals("ISO-8859-1", Charsets.ISO_8859_1.name());
      }
  
      @Test
      public void testRequiredCharsets() {
          final SortedMap<String, Charset> requiredCharsets = Charsets.requiredCharsets();
          // test for what we expect to be there as of Java 6
          // Make sure the object at the given key is the right one
          assertEquals(requiredCharsets.get("US-ASCII").name(), "US-ASCII");
          assertEquals(requiredCharsets.get("ISO-8859-1").name(), "ISO-8859-1");
          assertEquals(requiredCharsets.get("UTF-8").name(), "UTF-8");
          assertEquals(requiredCharsets.get("UTF-16").name(), "UTF-16");
          assertEquals(requiredCharsets.get("UTF-16BE").name(), "UTF-16BE");
          assertEquals(requiredCharsets.get("UTF-16LE").name(), "UTF-16LE");
      }
  
      @Test
      public void testToCharset_String() {
          assertEquals(Charset.defaultCharset(), Charsets.toCharset((String) null));
          assertEquals(Charset.defaultCharset(), Charsets.toCharset((Charset) null));
          assertEquals(Charset.defaultCharset(), Charsets.toCharset(Charset.defaultCharset()));
          assertEquals(StandardCharsets.UTF_8, Charsets.toCharset(StandardCharsets.UTF_8));
      }
  
      @Test
      public void testToCharset_String_Charset() {
          assertNull(Charsets.toCharset((String) null, null));
          assertEquals(Charset.defaultCharset(), Charsets.toCharset((String) null, Charset.defaultCharset()));
          assertEquals(Charset.defaultCharset(), Charsets.toCharset((Charset) null, Charset.defaultCharset()));
          assertNull(Charsets.toCharset((Charset) null, null));
          assertEquals(Charset.defaultCharset(), Charsets.toCharset(Charset.defaultCharset(), Charset.defaultCharset()));
          assertEquals(StandardCharsets.UTF_8, Charsets.toCharset(StandardCharsets.UTF_8, Charset.defaultCharset()));
          assertEquals(StandardCharsets.UTF_8, Charsets.toCharset(StandardCharsets.UTF_8, null));
      }
  
     @Test
     public void testUsAscii() {
         assertEquals(StandardCharsets.US_ASCII.name(), Charsets.US_ASCII.name());
     }
 
     @Test
     public void testUtf16() {
         assertEquals(StandardCharsets.UTF_16.name(), Charsets.UTF_16.name());
     }
 
     @Test
     public void testUtf16Be() {
         assertEquals(StandardCharsets.UTF_16BE.name(), Charsets.UTF_16BE.name());
     }
 
     @Test
     public void testUtf16Le() {
         assertEquals(StandardCharsets.UTF_16LE.name(), Charsets.UTF_16LE.name());
     }
 
     @Test
     public void testUtf8() {
         assertEquals(StandardCharsets.UTF_8.name(), Charsets.UTF_8.name());
     }
 
 }