/*
    * Copyright 2012-2013 smartics, Kronseder & Reiner GmbH
    *
    * Licensed 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 test.de.smartics.properties.spi.core.util;
  
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.is;
  import static org.powermock.api.mockito.PowerMockito.spy;
  import static org.powermock.api.mockito.PowerMockito.when;
  
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.io.ObjectInputStream;
  import java.io.ObjectOutputStream;
  import java.lang.reflect.Method;
  
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  import org.junit.runner.RunWith;
  import org.powermock.core.classloader.annotations.PrepareForTest;
  import org.powermock.modules.junit4.PowerMockRunner;
  
  import de.smartics.properties.spi.core.util.SerializableMethod;
  import de.smartics.testdoc.annotations.Uut;
  import de.smartics.testdoc.categories.Technical;
  
  /**
   * Tests {@link SerializableMethod}.
   */
  @Uut(type = SerializableMethod.class)
  @RunWith(PowerMockRunner.class)
  @PrepareForTest(SerializableMethod.class)
  public class SerializableMethodDeserializeTest
  {
    // ********************************* Fields *********************************
  
    // --- constants ------------------------------------------------------------
  
    private static final Class<?>[] NO_PARAMETER = new Class<?>[0];
  
    private static final Class<?>[] ONE_PARAMETER =
        new Class<?>[] { String.class };
  
    private static final Class<?>[] TWO_PARAMETERS =
        new Class<?>[] { String.class, String.class };
  
    private static final Method METHOD;
  
    static
    {
      try
      {
        METHOD = String.class.getMethod("toString", NO_PARAMETER);
      }
      catch (final Exception e)
      {
        throw new IllegalStateException("Cannot find method for test.", e);
      }
    }
  
    // --- members --------------------------------------------------------------
  
    // ****************************** Inner Classes *****************************
  
    // ********************************* Methods ********************************
  
    // --- prepare --------------------------------------------------------------
  
    // --- helper ---------------------------------------------------------------
  
    private void runDeserialization(final Class<?>[] parameterTypes)
      throws Exception
    {
      final SerializableMethod uut = createUut(parameterTypes);
      final ObjectInputStream input = createInvalidOis(uut);
  
      input.readObject();
    }
  
    private static SerializableMethod createUut(final Class<?>[] parameterTypes)
    {
      try
      {
        final Method spy = spy(METHOD);
        when(spy.getName()).thenReturn("unknown");
        when(spy.getParameterTypes()).thenReturn(parameterTypes);
       assertThat(spy.getName(), is("unknown"));
       final SerializableMethod uut = new SerializableMethod(spy);
       return uut;
     }
     catch (final Throwable e) // NOPMD
     {
       throw new IllegalStateException("Cannot create test spy.", e);
     }
   }
 
   private ObjectInputStream createInvalidOis(final SerializableMethod uut)
   {
     try
     {
       final ByteArrayOutputStream output = new ByteArrayOutputStream(1024);
       final ObjectOutputStream oos = new ObjectOutputStream(output);
 
       oos.writeObject(uut);
 
       final ObjectInputStream ois =
           new ObjectInputStream(new ByteArrayInputStream(output.toByteArray()));
       return ois;
     }
     catch (final Throwable e) // NOPMD
     {
       throw new IllegalStateException(
           "Cannot create invalid object input stream.", e);
     }
   }
 
   // --- tests ----------------------------------------------------------------
 
   @Test(expected = IOException.class)
   public void signalsProblemsIfSerializedFormCannotBeDeserialized()
     throws Exception
   {
     try
     {
       runDeserialization(NO_PARAMETER);
     }
     catch (final IOException e)
     {
       assertThat(e.getMessage(),
           is("Cannot recreate method java.lang.String.unknown()."));
       throw e;
     }
   }
 
   @Test(expected = IOException.class)
   @Category(Technical.class)
   public void signalsProblemsIfSerializedFormCannotBeDeserializedWithOneParameter()
     throws Exception
   {
     try
     {
       runDeserialization(ONE_PARAMETER);
     }
     catch (final IOException e)
     {
       assertThat(
           e.getMessage(),
           is("Cannot recreate method java.lang.String.unknown(java.lang.String)."));
       throw e;
     }
   }
 
   @Test(expected = IOException.class)
   @Category(Technical.class)
   public void signalsProblemsIfSerializedFormCannotBeDeserializedWithTwoParameters()
     throws Exception
   {
     try
     {
       runDeserialization(TWO_PARAMETERS);
     }
     catch (final IOException e)
     {
       assertThat(
           e.getMessage(),
           is("Cannot recreate method java.lang.String.unknown(java.lang.String, java.lang.String)."));
       throw e;
     }
   }
 }