/*
    * 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.Arrays;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Set;
  import java.util.stream.Collectors;
  import java.util.stream.Stream;
  
  import org.apache.commons.lang3.exception.UncheckedException;
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests {@link MethodInvokers#asFailableFunction(Method)}.
   */
  public class MethodInvokersFailableFunctionTest extends MethodFixtures {
  
      @Test
      public void testApply0Arg() throws Throwable {
          assertEquals(INSTANCE.getString(), MethodInvokers.asFailableFunction(getMethodForGetString()).apply(INSTANCE));
      }
  
      @Test
      public void testBuildVarArg() throws SecurityException, NoSuchMethodException {
          MethodInvokers.asFailableFunction(getMethodForGetStringVarStringArgs());
      }
  
      @Test
      public void testConstructorForNull() throws SecurityException {
          assertThrows(NullPointerException.class, () -> MethodInvokers.asFailableFunction((Method) null));
      }
  
      @Test
      public void testFindAndInvoke() throws SecurityException {
          // Finding
          final List<FailableFunction<Object, Object, Throwable>> invokers = Stream.of(MethodFixtures.class.getDeclaredMethods())
              .filter(m -> m.isAnnotationPresent(AnnotationTestFixture.class)).map(MethodInvokers::asFailableFunction).collect(Collectors.toList());
          assertEquals(2, invokers.size());
          // ...
          // Invoking
          final Set<Object> set = invokers.stream().map(i -> {
              try {
                  return i.apply(MethodFixtures.INSTANCE);
              } catch (final Throwable e) {
                  throw new UncheckedException(e);
              }
          }).collect(Collectors.toSet());
          assertEquals(new HashSet<>(Arrays.asList(INSTANCE.getString(), INSTANCE.getString2())), set);
      }
  
      @Test
      public void testThrowsChecked() throws Exception {
          assertThrows(Exception.class, () -> MethodInvokers.asFailableFunction(getMethodForGetStringThrowsChecked()).apply(INSTANCE));
      }
  
      @Test
      public void testToString() throws SecurityException, ReflectiveOperationException {
          // Should not blow up and must return _something_
          assertFalse(MethodInvokers.asFailableFunction(getMethodForGetString()).toString().isEmpty());
      }
  
  }