source: src/unittests/ObserverTest.cpp@ bd6bfa

/*
 * ObserverTest.cpp
 *
 *  Created on: Jan 19, 2010
 *      Author: crueger
 */

#include "ObserverTest.hpp"

#include <cppunit/CompilerOutputter.h>
#include <cppunit/extensions/TestFactoryRegistry.h>
#include <cppunit/ui/text/TestRunner.h>
#include <set>

#include "Patterns/Observer.hpp"
#include "Patterns/ObservedIterator.hpp"
#include "Helpers/Assert.hpp"

#include <iostream>

using namespace std;

#ifdef HAVE_TESTRUNNER
#include "UnitTestMain.hpp"
#endif /*HAVE_TESTRUNNER*/

// Registers the fixture into the 'registry'
CPPUNIT_TEST_SUITE_REGISTRATION( ObserverTest );

/******************* Test stubs ************************/

class UpdateCountObserver : public Observer {
public:
  UpdateCountObserver() :
    updates(0)
  {};
  void update(Observable *publisher){
    updates++;
  }
  void subjectKilled(Observable *publisher) {
  }
  int updates;
};

class SimpleObservable : public Observable {
public:
  void changeMethod() {
    OBSERVE;
    int i = 0;
    i++;
  }
};

class CallObservable : public Observable {
public:
  void changeMethod1() {
    OBSERVE;
    int i = 0;
    i++;
  }

  void changeMethod2() {
    OBSERVE;
    int i = 0;
    i++;
    changeMethod1();
  }
};

class BlockObservable : public Observable {
public:
  void changeMethod1(){
    OBSERVE;
    // test if we report correctly as blocked
    CPPUNIT_ASSERT(isBlocked());
  }

  void changeMethod2(){
    OBSERVE;
    internalMethod1();
    internalMethod2();
  }

  void internalMethod1(){
    // we did not block, but our caller did...
    // see if this is found
    CPPUNIT_ASSERT(isBlocked());
  }

  void internalMethod2(){
    OBSERVE;
    // Both this method and the caller do block
    // Does the reporting still work as expected?
    CPPUNIT_ASSERT(isBlocked());
  }

  void noChangeMethod(){
    // No Block introduced here
    // reported correctely?
    CPPUNIT_ASSERT(!isBlocked());
  }
};

class SuperObservable : public Observable {
public:
  SuperObservable(){
    subObservable = new SimpleObservable();
    subObservable->signOn(this);
  }
  ~SuperObservable(){
    delete subObservable;
  }
  void changeMethod() {
    OBSERVE;
    int i = 0;
    i++;
    subObservable->changeMethod();
  }
  SimpleObservable *subObservable;
};

class NotificationObservable : public Observable {
public:
  NotificationObservable() :
      notification1(new Notification(this)),
      notification2(new Notification(this))
  {}

  ~NotificationObservable(){
    delete notification1;
    delete notification2;
  }

  void operation1(){
    OBSERVE;
    NOTIFY(notification1);
  }

  void operation2(){
    OBSERVE;
    NOTIFY(notification2);
  }

  Notification_ptr notification1;
  Notification_ptr notification2;
};

class NotificationObserver : public Observer {
public:
  NotificationObserver(Notification_ptr notification) :
    requestedNotification(notification),
    wasNotified(false)
  {}

  void update(Observable*){}
  void subjectKilled(Observable*){}
  void recieveNotification(Observable *publisher, Notification_ptr notification){
    ASSERT(requestedNotification==notification,"Notification received that was not requested");
    wasNotified = true;
  }

  Notification_ptr requestedNotification;

  bool wasNotified;
};

class ObservableCollection : public Observable {
public:
  typedef std::set<SimpleObservable*> set;
  typedef ObservedIterator<set> iterator;
  typedef set::const_iterator const_iterator;

  ObservableCollection(int _num) :
  num(_num)
  {
    for(int i=0; i<num; ++i){
      SimpleObservable *content = new SimpleObservable();
      content->signOn(this);
      theSet.insert(content);
    }
  }

  ~ObservableCollection(){
    set::iterator iter;
    for(iter=theSet.begin(); iter!=theSet.end(); ++iter ){
      delete (*iter);
    }
  }

  iterator begin(){
    return iterator(theSet.begin(),this);
  }

  iterator end(){
    return iterator(theSet.end(),this);
  }

  const int num;

private:
  set theSet;
};


/******************* actuall tests ***************/

void ObserverTest::setUp() {
  ASSERT_DO(Assert::Throw);
  simpleObservable1 = new SimpleObservable();
  simpleObservable2 = new SimpleObservable();
  callObservable = new CallObservable();
  superObservable = new SuperObservable();
  blockObservable = new BlockObservable();
  notificationObservable = new NotificationObservable();
  collection = new ObservableCollection(5);

  observer1 = new UpdateCountObserver();
  observer2 = new UpdateCountObserver();
  observer3 = new UpdateCountObserver();
  observer4 = new UpdateCountObserver();

  notificationObserver1 = new NotificationObserver(notificationObservable->notification1);
  notificationObserver2 = new NotificationObserver(notificationObservable->notification2);
}

void ObserverTest::tearDown() {
  delete simpleObservable1;
  delete simpleObservable2;
  delete callObservable;
  delete superObservable;
  delete blockObservable;
  delete notificationObservable;
  delete collection;

  delete observer1;
  delete observer2;
  delete observer3;
  delete observer4;
  delete notificationObserver1;
  delete notificationObserver2;
}

void ObserverTest::doesUpdateTest()
{
  simpleObservable1->signOn(observer1);
  simpleObservable1->signOn(observer2);
  simpleObservable1->signOn(observer3);

  simpleObservable2->signOn(observer2);
  simpleObservable2->signOn(observer4);

  simpleObservable1->changeMethod();
  CPPUNIT_ASSERT_EQUAL( 1, observer1->updates );
  CPPUNIT_ASSERT_EQUAL( 1, observer2->updates );
  CPPUNIT_ASSERT_EQUAL( 1, observer3->updates );
  CPPUNIT_ASSERT_EQUAL( 0, observer4->updates );

  simpleObservable1->signOff(observer3);

  simpleObservable1->changeMethod();
  CPPUNIT_ASSERT_EQUAL( 2, observer1->updates );
  CPPUNIT_ASSERT_EQUAL( 2, observer2->updates );
  CPPUNIT_ASSERT_EQUAL( 1, observer3->updates );
  CPPUNIT_ASSERT_EQUAL( 0, observer4->updates );

  simpleObservable2->changeMethod();
  CPPUNIT_ASSERT_EQUAL( 2, observer1->updates );
  CPPUNIT_ASSERT_EQUAL( 3, observer2->updates );
  CPPUNIT_ASSERT_EQUAL( 1, observer3->updates );
  CPPUNIT_ASSERT_EQUAL( 1, observer4->updates );
}


void ObserverTest::doesBlockUpdateTest() {
  callObservable->signOn(observer1);

  callObservable->changeMethod1();
  CPPUNIT_ASSERT_EQUAL( 1, observer1->updates );

  callObservable->changeMethod2();
  CPPUNIT_ASSERT_EQUAL( 2, observer1->updates );
}

void ObserverTest::doesSubObservableTest() {
  superObservable->signOn(observer1);
  superObservable->subObservable->signOn(observer2);

  superObservable->subObservable->changeMethod();
  CPPUNIT_ASSERT_EQUAL( 1, observer1->updates );
  CPPUNIT_ASSERT_EQUAL( 1, observer2->updates );

  superObservable->changeMethod();
  CPPUNIT_ASSERT_EQUAL( 2, observer1->updates );
  CPPUNIT_ASSERT_EQUAL( 2, observer2->updates );
}

void ObserverTest::doesNotifyTest(){
  notificationObservable->signOn(notificationObserver1,
                                 notificationObservable->notification1);
  notificationObservable->signOn(notificationObserver2,
                                 notificationObservable->notification2);

  notificationObservable->operation1();
  CPPUNIT_ASSERT(notificationObserver1->wasNotified);
  CPPUNIT_ASSERT(!notificationObserver2->wasNotified);

  notificationObserver1->wasNotified=false;

  notificationObservable->operation2();
  CPPUNIT_ASSERT(!notificationObserver1->wasNotified);
  CPPUNIT_ASSERT(notificationObserver2->wasNotified);

}

void ObserverTest::doesReportTest(){
  // Actual checks are in the Stub-methods for this
  blockObservable->changeMethod1();
  blockObservable->changeMethod2();
  blockObservable->noChangeMethod();
}

void ObserverTest::iteratorTest(){
  int i = 0;
  // test the general iterator methods
  for(ObservableCollection::iterator iter=collection->begin(); iter!=collection->end();++iter){
    CPPUNIT_ASSERT(i< collection->num);
    i++;
  }

  i=0;
  for(ObservableCollection::const_iterator iter=collection->begin(); iter!=collection->end();++iter){
    CPPUNIT_ASSERT(i<collection->num);
    i++;
  }

  collection->signOn(observer1);
  {
    // we construct this out of the loop, so the iterator dies at the end of
    // the scope and not the end of the loop (allows more testing)
    ObservableCollection::iterator iter;
    for(iter=collection->begin(); iter!=collection->end(); ++iter){
      (*iter)->changeMethod();
    }
    // At this point no change should have been propagated
    CPPUNIT_ASSERT_EQUAL( 0, observer1->updates);
  }
  // After the Iterator has died the propagation should take place
  CPPUNIT_ASSERT_EQUAL( 1, observer1->updates);

  // when using a const_iterator no changes should be propagated
  for(ObservableCollection::const_iterator iter = collection->begin(); iter!=collection->end();++iter);
  CPPUNIT_ASSERT_EQUAL( 1, observer1->updates);
  collection->signOff(observer1);
}

void ObserverTest::CircleDetectionTest() {
  cout << endl << "Warning: the next test involved methods that can produce infinite loops." << endl;
  cout << "Errors in this methods can not be checked using the CPPUNIT_ASSERT Macros." << endl;
  cout << "Instead tests are run on these methods to see if termination is assured" << endl << endl;
  cout << "If this test does not complete in a few seconds, kill the test-suite and fix the Error in the circle detection mechanism" << endl;

  cout << endl << endl << "The following errors displayed by the observer framework can be ignored" << endl;

  // make this Observable its own subject. NEVER DO THIS IN ACTUAL CODE
  simpleObservable1->signOn(simpleObservable1);
  CPPUNIT_ASSERT_THROW(simpleObservable1->changeMethod(),Assert::AssertionFailure);

  // more complex test
  simpleObservable1->signOff(simpleObservable1);
  simpleObservable1->signOn(simpleObservable2);
  simpleObservable2->signOn(simpleObservable1);
  CPPUNIT_ASSERT_THROW(simpleObservable1->changeMethod(),Assert::AssertionFailure);
  simpleObservable1->signOff(simpleObservable2);
  simpleObservable2->signOff(simpleObservable1);
  // when we reach this line, although we broke the DAG assumption the circle check works fine
  CPPUNIT_ASSERT(true);
}