/*
    * 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.lookup;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertNull;
  
  import java.util.HashMap;
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  import java.util.function.Function;
  
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests {@link FunctionStringLookup}.
   */
  class FunctionStringLookupTest {
  
      @Test
      void testConcurrentHashMapNull() {
          assertNull(FunctionStringLookup.on(new ConcurrentHashMap<>()).apply(null));
      }
  
      @Test
      void testHashMapNull() {
          assertNull(FunctionStringLookup.on(new HashMap<>()).apply(null));
      }
  
      @Test
      void testNullFunction() {
          assertNull(FunctionStringLookup.on((Function<String, Object>) null).apply(null));
      }
  
      @Test
      void testOne() {
          final String key = "key";
          final String value = "value";
          final Map<String, String> map = new HashMap<>();
          map.put(key, value);
          assertEquals(value, FunctionStringLookup.on(map).apply(key));
      }
  
      @Test
      void testToString() {
          // does not blow up and gives some kind of string.
          assertFalse(FunctionStringLookup.on(new HashMap<>()).toString().isEmpty());
      }
  
  }