/*
    * 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 java.util.HashMap;
  import java.util.Map;
  
  import org.junit.jupiter.api.Test;
  
  class CosineSimilarityTest {
  
      @Test
      void testCosineSimilarityReturningDoubleWhereByteValueIsZero() {
          final Map<CharSequence, Integer> hashMap = new HashMap<>();
          assertEquals(0.0, CosineSimilarity.INSTANCE.cosineSimilarity(hashMap, hashMap), 0.01);
      }
  
      @Test
      void testCosineSimilarityThrowsIllegalArgumentException() {
          assertThrows(IllegalArgumentException.class, () -> CosineSimilarity.INSTANCE.cosineSimilarity(new HashMap<>(), null));
      }
  
      @Test
      void testCosineSimilarityWithNonEmptyMap() {
          final Map<CharSequence, Integer> hashMap = new HashMap<>();
          final Integer integer = -397;
          hashMap.put("3J/$3.L", integer);
          final Map<CharSequence, Integer> hashMapTwo = new HashMap<>();
          assertEquals(0.0, CosineSimilarity.INSTANCE.cosineSimilarity(hashMap, hashMapTwo), 0.01);
      }
  
      @Test
      void testCosineSimilarityWithNull() {
          assertThrows(IllegalArgumentException.class, () -> CosineSimilarity.INSTANCE.cosineSimilarity(null, null));
      }
  
  }