/*
    * 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;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  import static org.junit.jupiter.api.Assertions.assertNull;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  import java.lang.reflect.Constructor;
  import java.lang.reflect.Modifier;
  
  import org.junit.jupiter.api.Test;
  import org.junitpioneer.jupiter.DefaultLocale;
  
  /**
   * Tests {@link CaseUtils} class.
   */
  class CaseUtilsTest {
  
      @Test
      void testConstructor() {
          assertNotNull(new CaseUtils());
          final Constructor<?>[] cons = CaseUtils.class.getDeclaredConstructors();
          assertEquals(1, cons.length);
          assertTrue(Modifier.isPublic(cons[0].getModifiers()));
          assertTrue(Modifier.isPublic(CaseUtils.class.getModifiers()));
          assertFalse(Modifier.isFinal(CaseUtils.class.getModifiers()));
      }
  
      @Test
      void testToCamelCase() {
          assertNull(CaseUtils.toCamelCase(null, false, null));
          assertEquals("", CaseUtils.toCamelCase("", true, null));
          assertEquals("", CaseUtils.toCamelCase("  ", false, null));
          assertEquals("aBC@def", CaseUtils.toCamelCase("a  b  c  @def", false, null));
          assertEquals("ABC@def", CaseUtils.toCamelCase("a b c @def", true));
          assertEquals("ABC@def", CaseUtils.toCamelCase("a b c @def", true, '-'));
          assertEquals("ABC@def", CaseUtils.toCamelCase("a b c @def", true, '-'));
  
          final char[] chars = { '-', '+', ' ', '@' };
          assertEquals("", CaseUtils.toCamelCase("-+@ ", true, chars));
          assertEquals("toCamelCase", CaseUtils.toCamelCase("   to-CAMEL-cASE", false, chars));
          assertEquals("ToCamelCase", CaseUtils.toCamelCase("@@@@   to+CAMEL@cASE ", true, chars));
          assertEquals("ToCaMeLCase", CaseUtils.toCamelCase("To+CA+ME L@cASE", true, chars));
  
          assertEquals("toCamelCase", CaseUtils.toCamelCase("To.Camel.Case", false, '.'));
          assertEquals("toCamelCase", CaseUtils.toCamelCase("To.Camel-Case", false, '-', '.'));
          assertEquals("toCamelCase", CaseUtils.toCamelCase(" to @ Camel case", false, '-', '@'));
          assertEquals("ToCamelCase", CaseUtils.toCamelCase(" @to @ Camel case", true, '-', '@'));
  
          assertEquals("ToCamelCase", CaseUtils.toCamelCase("TO CAMEL CASE", true, null));
          assertEquals("toCamelCase", CaseUtils.toCamelCase("TO CAMEL CASE", false, null));
          assertEquals("toCamelCase", CaseUtils.toCamelCase("TO CAMEL CASE", false, null));
          assertEquals("tocamelcase", CaseUtils.toCamelCase("tocamelcase", false, null));
          assertEquals("Tocamelcase", CaseUtils.toCamelCase("tocamelcase", true, null));
          assertEquals("tocamelcase", CaseUtils.toCamelCase("Tocamelcase", false, null));
  
          assertEquals("Tocamelcase", CaseUtils.toCamelCase("tocamelcase", true));
          assertEquals("tocamelcase", CaseUtils.toCamelCase("tocamelcase", false));
  
          assertEquals("\uD800\uDF00\uD800\uDF02", CaseUtils.toCamelCase("\uD800\uDF00 \uD800\uDF02", true));
          assertEquals("\uD800\uDF00\uD800\uDF01\uD800\uDF02\uD800\uDF03",
                  CaseUtils.toCamelCase("\uD800\uDF00\uD800\uDF01\uD800\uDF14\uD800\uDF02\uD800\uDF03", true, '\uD800', '\uDF14'));
      }
  
      @Test
      @DefaultLocale(language = "tr", country = "TR")
      void testToCamelCaseLocaleIndependent() {
          // Turkish lower-cases 'I' (U+0049) to dotless 'i' (U+0131), which would otherwise leak into the result.
          assertEquals("TipTop", CaseUtils.toCamelCase("TIP.TOP", true, '.'));
          assertEquals("toCamelCase", CaseUtils.toCamelCase("TO CAMEL CASE", false, null));
      }
  }