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// A sample program demonstrating using Google C++ testing framework.

//

// Author: wan@google.com (Zhanyong Wan)

// In this example, we use a more advanced feature of Google Test called

// test fixture.

//

// A test fixture is a place to hold objects and functions shared by

// all tests in a test case.  Using a test fixture avoids duplicating

// the test code necessary to initialize and cleanup those common

// objects for each test.  It is also useful for defining sub-routines

// that your tests need to invoke a lot.

//

// <TechnicalDetails>

//

// The tests share the test fixture in the sense of code sharing, not

// data sharing.  Each test is given its own fresh copy of the

// fixture.  You cannot expect the data modified by one test to be

// passed on to another test, which is a bad idea.

//

// The reason for this design is that tests should be independent and

// repeatable.  In particular, a test should not fail as the result of

// another test's failure.  If one test depends on info produced by

// another test, then the two tests should really be one big test.

//

// The macros for indicating the success/failure of a test

// (EXPECT_TRUE, FAIL, etc) need to know what the current test is

// (when Google Test prints the test result, it tells you which test

// each failure belongs to).  Technically, these macros invoke a

// member function of the Test class.  Therefore, you cannot use them

// in a global function.  That's why you should put test sub-routines

// in a test fixture.

//

// </TechnicalDetails>

#include "sample3-inl.h"

#include "gtest/gtest.h"

// To use a test fixture, derive a class from testing::Test.

class QueueTest : public testing::Test {

 protected:  // You should make the members protected s.t. they can be

             // accessed from sub-classes.

  // virtual void SetUp() will be called before each test is run.  You

  // should define it if you need to initialize the varaibles.

  // Otherwise, this can be skipped.

  virtual void SetUp() {

    q1_.Enqueue(1);

    q2_.Enqueue(2);

    q2_.Enqueue(3);

  }

  // virtual void TearDown() will be called after each test is run.

  // You should define it if there is cleanup work to do.  Otherwise,

  // you don't have to provide it.

  //

  // virtual void TearDown() {

  // }

  // A helper function that some test uses.

  static int Double(int n) {

    return 2*n;

  }

  // A helper function for testing Queue::Map().

  void MapTester(const Queue<int> * q) {

    // Creates a new queue, where each element is twice as big as the

    // corresponding one in q.

    const Queue<int> * const new_q = q->Map(Double);

    // Verifies that the new queue has the same size as q.

    ASSERT_EQ(q->Size(), new_q->Size());

    // Verifies the relationship between the elements of the two queues.

    for ( const QueueNode<int> * n1 = q->Head(), * n2 = new_q->Head();

          n1 != NULL; n1 = n1->next(), n2 = n2->next() ) {

      EXPECT_EQ(2 * n1->element(), n2->element());

    }

    delete new_q;

  }

  // Declares the variables your tests want to use.

  Queue<int> q0_;

  Queue<int> q1_;

  Queue<int> q2_;

};

// When you have a test fixture, you define a test using TEST_F

// instead of TEST.

// Tests the default c'tor.

TEST_F(QueueTest, DefaultConstructor) {

  // You can access data in the test fixture here.

  EXPECT_EQ(0u, q0_.Size());

}

// Tests Dequeue().

TEST_F(QueueTest, Dequeue) {

  int * n = q0_.Dequeue();

  EXPECT_TRUE(n == NULL);

  n = q1_.Dequeue();

  ASSERT_TRUE(n != NULL);

  EXPECT_EQ(1, *n);

  EXPECT_EQ(0u, q1_.Size());

  delete n;

  n = q2_.Dequeue();

  ASSERT_TRUE(n != NULL);

  EXPECT_EQ(2, *n);

  EXPECT_EQ(1u, q2_.Size());

  delete n;

}

// Tests the Queue::Map() function.

TEST_F(QueueTest, Map) {

  MapTester(&q0_);

  MapTester(&q1_);

  MapTester(&q2_);

}