/*
    * 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.codec.net;
  
  import static org.junit.jupiter.api.Assertions.assertNull;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  import java.nio.charset.StandardCharsets;
  
  import org.apache.commons.codec.CharEncoding;
  import org.apache.commons.codec.DecoderException;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.params.ParameterizedTest;
  import org.junit.jupiter.params.provider.ValueSource;
  
  /**
   * RFC 1522 compliant codec test cases
   */
  class RFC1522CodecTest {
  
      static class RFC1522TestCodec extends RFC1522Codec {
  
          RFC1522TestCodec() {
              super(StandardCharsets.UTF_8);
          }
  
          @Override
          protected byte[] doDecoding(final byte[] bytes) {
              return bytes;
          }
  
          @Override
          protected byte[] doEncoding(final byte[] bytes) {
              return bytes;
          }
  
          @Override
          protected String getEncoding() {
              return "T";
          }
      }
  
      static void assertExpectedDecoderException(final String text) {
          assertThrows(DecoderException.class, () -> new RFC1522TestCodec().decodeText(text));
      }
  
      @ParameterizedTest
      // @formatter:off
      @ValueSource(strings = {
          "whatever",
          "=?",
          "?=",
          "==",
          "=?=",
          "=??=",
          "=?stuff?=",
          "=?UTF-8??=",
          "=?UTF-8?stuff?=",
          "=?UTF-8?T?stuff",
          "=??T?stuff?=",
          "=?UTF-8??stuff?=",
          "=?UTF-8?W?stuff?=",
          "=?UTF-8?T?stuff?more?=",
          "=?UTF-8?T?stuff??=",
          "=?UTF-8?T???="
      })
      // @formatter:on
      void testDecodeInvalid(final String text) throws Exception {
          assertExpectedDecoderException(text);
      }
  
      @Test
      void testNullInput() throws Exception {
          final RFC1522TestCodec testCodec = new RFC1522TestCodec();
          assertNull(testCodec.decodeText(null));
          assertNull(testCodec.encodeText(null, CharEncoding.UTF_8));
      }
  }