/*
    * 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;
  import org.junit.jupiter.params.ParameterizedTest;
  import org.junit.jupiter.params.provider.MethodSource;
  
  /**
   * Tests {@link HammingDistance}.
   */
  class HammingDistanceTest {
  
      private static HammingDistance distance;
  
      @BeforeAll
      public static void setUp() {
          distance = new HammingDistance();
      }
  
      @Test
      void testApply_DifferentSimilarityInputLength() {
          assertThrows(IllegalArgumentException.class, () -> distance.apply(new SimilarityCharacterInput("a"), new SimilarityCharacterInput("ab")));
      }
  
      @Test
      void testApply_NullSimilarityInput() {
          assertThrows(IllegalArgumentException.class, () -> distance.apply(null, new SimilarityCharacterInput("a")));
      }
  
      @Test
      void testApply_SimilarityInputNull() {
          assertThrows(IllegalArgumentException.class, () -> distance.apply(new SimilarityCharacterInput("a"), null));
      }
  
      @ParameterizedTest
      @MethodSource("org.apache.commons.text.similarity.SimilarityInputTest#similarityInputsEquals()")
      void testHammingDistance(final Class<?> cls) {
          assertEquals(0, distance.apply(SimilarityInputTest.build(cls, ""), SimilarityInputTest.build(cls, "")));
          assertEquals(0, distance.apply(SimilarityInputTest.build(cls, "pappa"), SimilarityInputTest.build(cls, "pappa")));
          assertEquals(1, distance.apply(SimilarityInputTest.build(cls, "papaa"), SimilarityInputTest.build(cls, "pappa")));
          assertEquals(3, distance.apply(SimilarityInputTest.build(cls, "karolin"), SimilarityInputTest.build(cls, "kathrin")));
          assertEquals(3, distance.apply(SimilarityInputTest.build(cls, "karolin"), SimilarityInputTest.build(cls, "kerstin")));
          assertEquals(2, distance.apply(SimilarityInputTest.build(cls, "1011101"), SimilarityInputTest.build(cls, "1001001")));
          assertEquals(3, distance.apply(SimilarityInputTest.build(cls, "2173896"), SimilarityInputTest.build(cls, "2233796")));
          assertEquals(2, distance.apply(SimilarityInputTest.build(cls, "ATCG"), SimilarityInputTest.build(cls, "ACCC")));
      }
  
      @Test
      void testHammingDistance_nullLeftValue() {
          assertThrows(IllegalArgumentException.class, () -> distance.apply(null, ""));
      }
  
      @Test
      void testHammingDistance_nullRightValue() {
          assertThrows(IllegalArgumentException.class, () -> distance.apply("", null));
      }
  
      @Test
      void testHammingDistanceCharSequence() {
          assertEquals(0, distance.apply("", ""));
          assertEquals(0, distance.apply("pappa", "pappa"));
          assertEquals(1, distance.apply("papaa", "pappa"));
          assertEquals(3, distance.apply("karolin", "kathrin"));
          assertEquals(3, distance.apply("karolin", "kerstin"));
          assertEquals(2, distance.apply("1011101", "1001001"));
          assertEquals(3, distance.apply("2173896", "2233796"));
          assertEquals(2, distance.apply("ATCG", "ACCC"));
      }
  }