/*
    * 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.text.similarity;
  
  import static org.assertj.core.api.Assertions.assertThatIllegalArgumentException;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  import org.junit.jupiter.api.BeforeAll;
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests {@link JaccardDistance}.
   */
  public class JaccardDistanceTest {
  
      private static JaccardDistance classBeingTested;
  
      @BeforeAll
      public static void setUp() {
          classBeingTested = new JaccardDistance();
      }
  
      @Test
      public void testGettingJaccardDistance() {
          // Expected Jaccard distance = 1.0 - (intersect / union)
          assertEquals(0.0, classBeingTested.apply("", ""));
          assertEquals(1.0, classBeingTested.apply("left", ""));
          assertEquals(1.0, classBeingTested.apply("", "right"));
          assertEquals(1.0 - 3.0 / 4, classBeingTested.apply("frog", "fog"));
          assertEquals(1.0, classBeingTested.apply("fly", "ant"));
          assertEquals(1.0 - 2.0 / 9, classBeingTested.apply("elephant", "hippo"));
          assertEquals(1.0 - 7.0 / 11, classBeingTested.apply("ABC Corporation", "ABC Corp"));
          assertEquals(1.0 - 13.0 / 17,
                  classBeingTested.apply("D N H Enterprises Inc", "D & H Enterprises, Inc."));
          assertEquals(1.0 - 16.0 / 18,
                  classBeingTested.apply("My Gym Children's Fitness Center", "My Gym. Childrens Fitness"));
          assertEquals(1.0 - 9.0 / 10, classBeingTested.apply("PENNSYLVANIA", "PENNCISYLVNIA"));
          assertEquals(1.0 - 1.0 / 8, classBeingTested.apply("left", "right"));
          assertEquals(1.0 - 1.0 / 8, classBeingTested.apply("leettteft", "ritttght"));
          assertEquals(0.0, classBeingTested.apply("the same string", "the same string"));
      }
  
      @Test
      public void testGettingJaccardDistanceNullNull() {
          assertThatIllegalArgumentException().isThrownBy(() -> classBeingTested.apply(null, null));
      }
  
      @Test
      public void testGettingJaccardDistanceNullString() {
          assertThatIllegalArgumentException().isThrownBy(() -> classBeingTested.apply(null, "right"));
      }
  
      @Test
      public void testGettingJaccardDistanceStringNull() {
          assertThatIllegalArgumentException().isThrownBy(() -> classBeingTested.apply(" ", null));
      }
  }