/*
    * 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.assertNotNull;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  import java.text.DateFormat;
  import java.text.ParseException;
  import java.text.SimpleDateFormat;
  import java.util.Date;
  
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests {@link DateStringLookup}.
   */
  class DateStringLookupTest {
  
      @Test
      void testBadFormat() {
          assertThrows(IllegalArgumentException.class,
              () -> DateStringLookup.INSTANCE.apply("this-is-a-bad-format-dontcha-know"));
      }
  
      @Test
      void testDefault() throws ParseException {
          final String formatted = DateStringLookup.INSTANCE.apply(null);
          DateFormat.getInstance().parse(formatted); // throws ParseException
  
      }
  
      @Test
      void testFormat() {
          final String format = "yyyy-MM-dd";
          final String value = DateStringLookup.INSTANCE.apply(format);
          // System.out.println(value);
          assertNotNull(value, "No Date");
          final SimpleDateFormat simpleDateFormat = new SimpleDateFormat(format);
          final String today = simpleDateFormat.format(new Date());
          assertEquals(value, today);
  
      }
  
      @Test
      void testToString() {
          // does not blow up and gives some kind of string.
          Assertions.assertFalse(DateStringLookup.INSTANCE.toString().isEmpty());
      }
  
  }