/*
    * 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.lang3;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  import java.nio.charset.StandardCharsets;
  
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests CharEncoding.
   *
   * @see CharEncoding
   */
  @SuppressWarnings("deprecation")
  public class CharEncodingTest extends AbstractLangTest {
  
      private void assertSupportedEncoding(final String name) {
          assertTrue(CharEncoding.isSupported(name), "Encoding should be supported: " + name);
      }
  
      /**
       * The class can be instantiated.
       */
      @Test
      public void testConstructor() {
          new CharEncoding();
      }
  
      @Test
      public void testMustBeSupportedJava1_3_1_and_above() {
          this.assertSupportedEncoding(CharEncoding.ISO_8859_1);
          this.assertSupportedEncoding(CharEncoding.US_ASCII);
          this.assertSupportedEncoding(CharEncoding.UTF_16);
          this.assertSupportedEncoding(CharEncoding.UTF_16BE);
          this.assertSupportedEncoding(CharEncoding.UTF_16LE);
          this.assertSupportedEncoding(CharEncoding.UTF_8);
      }
  
      @Test
      public void testNotSupported() {
          assertFalse(CharEncoding.isSupported(null));
          assertFalse(CharEncoding.isSupported(""));
          assertFalse(CharEncoding.isSupported(" "));
          assertFalse(CharEncoding.isSupported("\t\r\n"));
          assertFalse(CharEncoding.isSupported("DOESNOTEXIST"));
          assertFalse(CharEncoding.isSupported("this is not a valid encoding name"));
      }
  
      @Test
      public void testStandardCharsetsEquality() {
          assertEquals(StandardCharsets.ISO_8859_1.name(), CharEncoding.ISO_8859_1);
          assertEquals(StandardCharsets.US_ASCII.name(), CharEncoding.US_ASCII);
          assertEquals(StandardCharsets.UTF_8.name(), CharEncoding.UTF_8);
          assertEquals(StandardCharsets.UTF_16.name(), CharEncoding.UTF_16);
          assertEquals(StandardCharsets.UTF_16BE.name(), CharEncoding.UTF_16BE);
          assertEquals(StandardCharsets.UTF_16LE.name(), CharEncoding.UTF_16LE);
      }
  
      @Test
      public void testSupported() {
          assertTrue(CharEncoding.isSupported("UTF8"));
          assertTrue(CharEncoding.isSupported("UTF-8"));
          assertTrue(CharEncoding.isSupported("ASCII"));
      }
  }