content: /*
   *  Copyright (C) 2019 Alpha Jiang. All rights reserved.
   *
   *  Licensed 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 io.github.alphajiang.hyena.utils;
  
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.Test;
  
  import java.util.ArrayList;
  import java.util.List;
  
  public class TestCollectionUtils {
  
      @Test
      public void test_join_null() {
          String result = CollectionUtils.join(null, ",");
          Assertions.assertEquals("", result);
      }
  
      @Test
      public void test_join_string() {
          List<String> list = new ArrayList<>();
          list.add("aaa");
          list.add(null);
          list.add("bbb");
          String result = CollectionUtils.join(list, "==");
          Assertions.assertEquals("aaa==bbb", result);
      }
  
      @Test
      public void test_join_empty() {
          String result = CollectionUtils.join(List.of("", ""), "==");
          Assertions.assertEquals("", result);
      }
  
      @Test
      public void test_join_char() {
          String result = CollectionUtils.join(List.of(Character.valueOf('a'), Character.valueOf('b')), "-");
          Assertions.assertEquals("a-b", result);
      }
  
      @Test
      public void test_join_int() {
          List<Integer> list = new ArrayList<>();
          list.add(123);
          list.add(null);
          list.add(456);
          String result = CollectionUtils.join(list, "-");
          Assertions.assertEquals("123-456", result);
      }
  }
  