/*
    * 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.similarity;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  import org.junit.jupiter.api.BeforeAll;
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests {@link LongestCommonSubsequenceDistance}.
   */
  class LongestCommonSubsequenceDistanceTest {
  
      private static LongestCommonSubsequenceDistance subject;
  
      @BeforeAll
      public static void setup() {
          subject = new LongestCommonSubsequenceDistance();
      }
  
      @Test
      void testGettingLongestCommonSubsequenceDistance() {
          assertEquals(0, subject.apply("", ""));
          assertEquals(4, subject.apply("left", ""));
          assertEquals(5, subject.apply("", "right"));
          assertEquals(1, subject.apply("frog", "fog"));
          assertEquals(6, subject.apply("fly", "ant"));
          assertEquals(11, subject.apply("elephant", "hippo"));
          assertEquals(7, subject.apply("ABC Corporation", "ABC Corp"));
          assertEquals(4, subject.apply("D N H Enterprises Inc", "D & H Enterprises, Inc."));
          assertEquals(9, subject.apply("My Gym Children's Fitness Center", "My Gym. Childrens Fitness"));
          assertEquals(3, subject.apply("PENNSYLVANIA", "PENNCISYLVNIA"));
          assertEquals(7, subject.apply("left", "right"));
          assertEquals(9, subject.apply("leettteft", "ritttght"));
          assertEquals(0, subject.apply("the same string", "the same string"));
      }
  
      @Test
      void testGettingLongestCommonSubsequenceDistanceNullNull() {
          assertThrows(IllegalArgumentException.class, () -> subject.apply(null, null));
      }
  
      @Test
      void testGettingLongestCommonSubsequenceDistanceNullString() {
          assertThrows(IllegalArgumentException.class, () -> subject.apply(null, "right"));
      }
  
      @Test
      void testGettingLongestCommonSubsequenceDistanceStringNull() {
          assertThrows(IllegalArgumentException.class, () -> subject.apply(" ", null));
      }
  
  }