/*
    * Copyright (C) 2009 The Guava Authors
    *
    * 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 com.google.common.testing;
  
  import junit.framework.AssertionFailedError;
  import junit.framework.TestCase;
  
  import java.io.Serializable;
  
  /**
   * Tests for {@link SerializableTester}.
   *
   * @author Nick Kralevich
   */
  public class SerializableTesterTest extends TestCase {
    public void testStringAssertions() {
      String original = "hello world";
      String copy = SerializableTester.reserializeAndAssert(original);
      assertEquals(original, copy);
      assertNotSame(original, copy);
    }
  
    public void testClassWhichDoesNotImplementEquals() {
      ClassWhichDoesNotImplementEquals orig =
          new ClassWhichDoesNotImplementEquals();
      boolean errorNotThrown = false;
      try {
        SerializableTester.reserializeAndAssert(orig);
        errorNotThrown = true;
      } catch (AssertionFailedError error) {
        // expected
        assertContains("must be Object#equals to", error.getMessage());
      }
      assertFalse(errorNotThrown);
    }
  
    public void testClassWhichIsAlwaysEqualButHasDifferentHashcodes() {
      ClassWhichIsAlwaysEqualButHasDifferentHashcodes orig =
          new ClassWhichIsAlwaysEqualButHasDifferentHashcodes();
      boolean errorNotThrown = false;
      try {
        SerializableTester.reserializeAndAssert(orig);
        errorNotThrown = true;
      } catch (AssertionFailedError error) {
        // expected
        assertContains("must be equal to the Object#hashCode", error.getMessage());
      }
      assertFalse(errorNotThrown);
    }
  
    public void testObjectWhichIsEqualButChangesClass() {
      ObjectWhichIsEqualButChangesClass orig =
          new ObjectWhichIsEqualButChangesClass();
      boolean errorNotThrown = false;
      try {
        SerializableTester.reserializeAndAssert(orig);
        errorNotThrown = true;
      } catch (AssertionFailedError error) {
        // expected
        assertContains("expected:<class ", error.getMessage());
      }
      assertFalse(errorNotThrown);
    }
  
    private static class ClassWhichDoesNotImplementEquals
        implements Serializable {
      private static final long serialVersionUID = 1L;
    }
  
    private static class ClassWhichIsAlwaysEqualButHasDifferentHashcodes
        implements Serializable {
      private static final long serialVersionUID = 2L;
  
      @Override
      public boolean equals(Object other) {
        return (other instanceof ClassWhichIsAlwaysEqualButHasDifferentHashcodes);
      }
    }
  
    private static class ObjectWhichIsEqualButChangesClass
        implements Serializable {
      private static final long serialVersionUID = 1L;
  
      @Override
      public boolean equals(Object other) {
       return (other instanceof ObjectWhichIsEqualButChangesClass
           || other instanceof OtherForm);
     }
 
     @Override
     public int hashCode() {
       return 1;
     }
 
     private Object writeReplace() {
       return new OtherForm();
     }
 
     private static class OtherForm implements Serializable {
       @Override
       public boolean equals(Object other) {
         return (other instanceof ObjectWhichIsEqualButChangesClass
             || other instanceof OtherForm);
       }
 
       @Override
       public int hashCode() {
         return 1;
       }
     }
   }
 
   private static void assertContains(String expectedSubstring, String actual) {
     // TODO(kevinb): use a Truth assertion here
     if (!actual.contains(expectedSubstring)) {
       fail("expected <" + actual + "> to contain <" + expectedSubstring + ">");
     }
   }
 }