/*
    * 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
    *
    *      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 org.apache.commons.lang3.function;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  import java.lang.reflect.Method;
  import java.util.function.BiFunction;
  
  import org.apache.commons.lang3.exception.CustomUncheckedException;
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests {@link MethodInvokers#asBiFunction(Method)}.
   */
  public class MethodInvokersBiFunctionTest extends MethodFixtures {
  
      @Test
      public void testApply1Arg() throws NoSuchMethodException, SecurityException {
          final BiFunction<MethodFixtures, String, String> func = MethodInvokers.asBiFunction(getMethodForGetString1Arg());
          assertEquals(INSTANCE.getString1Arg("A"), func.apply(INSTANCE, "A"));
      }
  
      @Test
      public void testApply1ArgThrowsUnchecked() throws NoSuchMethodException, SecurityException {
          final BiFunction<MethodFixtures, String, String> func = MethodInvokers.asBiFunction(getMethodForGetString1ArgThrowsUnchecked());
          assertThrows(CustomUncheckedException.class, () -> func.apply(INSTANCE, "A"));
      }
  
      @Test
      public void testConstructorForNull() throws SecurityException {
          assertThrows(NullPointerException.class, () -> MethodInvokers.asBiFunction(null));
      }
  
      @Test
      public void testFullExample() throws SecurityException, ReflectiveOperationException {
          final Method method = String.class.getMethod("charAt", int.class);
          final BiFunction<String, Integer, Character> function = MethodInvokers.asBiFunction(method);
          assertEquals('C', function.apply("ABC", 2));
      }
  
      @Test
      public void testToString() throws SecurityException, ReflectiveOperationException {
          // Should not blow up and must return _something_
          assertFalse(MethodInvokers.asBiFunction(getMethodForGetString1Arg()).toString().isEmpty());
      }
  
  }