/*
    * 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.text.translate;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests {@link UnicodeEscaper}.
   */
  class UnicodeUnescaperTest {
  
      @Test
      void testLessThanFour() {
          final UnicodeUnescaper escaper = new UnicodeUnescaper();
          final String input = "\\0047\\u006";
          assertThrows(IllegalArgumentException.class, () -> escaper.translate(input));
      }
  
      @Test
      void testTooShort() {
          assertThrows(IllegalArgumentException.class, () -> new UnicodeUnescaper().translate("\\u"));
      }
  
      // Requested in LANG-507
      @Test
      void testUPlus() {
          final UnicodeUnescaper escaper = new UnicodeUnescaper();
          final String input = "\\u+0047";
          assertEquals("G", escaper.translate(input), "Failed to unescape Unicode characters with 'u+' notation");
      }
  
      @Test
      void testUuuuu() {
          final UnicodeUnescaper escaper = new UnicodeUnescaper();
          final String input = "\\uuuuuuuu0047";
          final String result = escaper.translate(input);
          assertEquals("G", result, "Failed to unescape Unicode characters with many 'u' characters");
      }
  }