/*
    * 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.maven.surefire.api.util;
  
  import java.lang.reflect.Constructor;
  
  import org.junit.Test;
  
  import static org.assertj.core.api.Assertions.assertThat;
  
  /**
   * Unit test for {@link ReflectionUtils}.
   *
   * @author <a href="mailto:tibordigana@apache.org">Tibor Digana (tibor17)</a>
   * @since 2.20.1
   */
  public class ReflectionUtilsTest {
      @Test
      public void shouldGetConstructor() throws Exception {
          Constructor<ClassWithParameterizedConstructor> constructor =
                  ReflectionUtils.tryGetConstructor(ClassWithParameterizedConstructor.class, int.class);
          assertThat(constructor).isNotNull();
          // Verify the Constructor returned really is for the class it should be
          assertThat(constructor.newInstance(10)).isInstanceOf(ClassWithParameterizedConstructor.class);
      }
  
      @Test
      public void shouldNotGetNonExistingConstructor() {
          assertThat(ReflectionUtils.tryGetConstructor(ClassWithParameterizedConstructor.class, String.class))
                  .isNull();
      }
  
      @Test
      public void shouldReloadClass() throws Exception {
          ClassLoader cl = Thread.currentThread().getContextClassLoader();
          assertThat(ReflectionUtils.reloadClass(cl, new B())).isEqualTo(B.class);
      }
  
      @Test(expected = RuntimeException.class)
      public void shouldNotInvokeStaticMethod() {
          ReflectionUtils.invokeStaticMethod(ReflectionUtilsTest.class, "notCallable", new Class<?>[0], new Object[0]);
      }
  
      @Test
      public void shouldInvokeStaticMethod() {
          Object o = ReflectionUtils.invokeStaticMethod(
                  ReflectionUtilsTest.class, "callable", new Class<?>[0], new Object[0]);
          assertThat(o).isEqualTo(3L);
      }
  
      @Test
      public void shouldInvokeMethodChain() {
          Class<?>[] classes1 = {A.class, A.class};
          String[] chain = {"current", "pid"};
          Object o = ReflectionUtils.invokeMethodChain(classes1, chain, null);
          assertThat(o).isEqualTo(3L);
  
          Class<?>[] classes2 = {A.class, A.class, B.class};
          String[] longChain = {"current", "createB", "pid"};
          o = ReflectionUtils.invokeMethodChain(classes2, longChain, null);
          assertThat(o).isEqualTo(1L);
      }
  
      @Test
      public void shouldInvokeFallbackOnMethodChain() {
          Class<?>[] classes1 = {A.class, A.class};
          String[] chain = {"current", "abc"};
          Object o = ReflectionUtils.invokeMethodChain(classes1, chain, 5L);
          assertThat(o).isEqualTo(5L);
  
          Class<?>[] classes2 = {A.class, B.class, B.class};
          String[] longChain = {"current", "createB", "abc"};
          o = ReflectionUtils.invokeMethodChain(classes2, longChain, 6L);
          assertThat(o).isEqualTo(6L);
      }
  
      private static void notCallable() {}
  
      public static long callable() {
          return 3L;
      }
  
      static class A {
         public static A current() {
             return new A();
         }
 
         public long pid() {
             return 3L;
         }
 
         public B createB() {
             return new B();
         }
     }
 
     static class B {
         public long pid() {
             return 1L;
         }
     }
 
     // The constructor has to be public for ReflectionUtils.tryGetConstructor to find it. Currently, the checkstyle
     // rules require that class be public too, and a public class must be documented, hence minimalist javadoc.
     /** */
     public static class ClassWithParameterizedConstructor {
         public ClassWithParameterizedConstructor(int param) {}
     }
 }