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

// This sample teaches how to reuse a test fixture in multiple test

// cases by deriving sub-fixtures from it.

//

// When you define a test fixture, you specify the name of the test

// case that will use this fixture.  Therefore, a test fixture can

// be used by only one test case.

//

// Sometimes, more than one test cases may want to use the same or

// slightly different test fixtures.  For example, you may want to

// make sure that all tests for a GUI library don't leak important

// system resources like fonts and brushes.  In Google Test, you do

// this by putting the shared logic in a super (as in "super class")

// test fixture, and then have each test case use a fixture derived

// from this super fixture.

#include <limits.h>

#include <time.h>

#include "sample3-inl.h"

#include "gtest/gtest.h"

#include "sample1.h"

// In this sample, we want to ensure that every test finishes within

// ~5 seconds.  If a test takes longer to run, we consider it a

// failure.

//

// We put the code for timing a test in a test fixture called

// "QuickTest".  QuickTest is intended to be the super fixture that

// other fixtures derive from, therefore there is no test case with

// the name "QuickTest".  This is OK.

//

// Later, we will derive multiple test fixtures from QuickTest.

class QuickTest : public testing::Test {

 protected:

  // Remember that SetUp() is run immediately before a test starts.

  // This is a good place to record the start time.

  virtual void SetUp() {

    start_time_ = time(NULL);

  }

  // TearDown() is invoked immediately after a test finishes.  Here we

  // check if the test was too slow.

  virtual void TearDown() {

    // Gets the time when the test finishes

    const time_t end_time = time(NULL);

    // Asserts that the test took no more than ~5 seconds.  Did you

    // know that you can use assertions in SetUp() and TearDown() as

    // well?

    EXPECT_TRUE(end_time - start_time_ <= 5) << "The test took too long.";

  }

  // The UTC time (in seconds) when the test starts

  time_t start_time_;

};

// We derive a fixture named IntegerFunctionTest from the QuickTest

// fixture.  All tests using this fixture will be automatically

// required to be quick.

class IntegerFunctionTest : public QuickTest {

  // We don't need any more logic than already in the QuickTest fixture.

  // Therefore the body is empty.

};

// Now we can write tests in the IntegerFunctionTest test case.

// Tests Factorial()

TEST_F(IntegerFunctionTest, Factorial) {

  // Tests factorial of negative numbers.

  EXPECT_EQ(1, Factorial(-5));

  EXPECT_EQ(1, Factorial(-1));

  EXPECT_GT(Factorial(-10), 0);

  // Tests factorial of 0.

  EXPECT_EQ(1, Factorial(0));

  // Tests factorial of positive numbers.

  EXPECT_EQ(1, Factorial(1));

  EXPECT_EQ(2, Factorial(2));

  EXPECT_EQ(6, Factorial(3));

  EXPECT_EQ(40320, Factorial(8));

}

// Tests IsPrime()

TEST_F(IntegerFunctionTest, IsPrime) {

  // Tests negative input.

  EXPECT_FALSE(IsPrime(-1));

  EXPECT_FALSE(IsPrime(-2));

  EXPECT_FALSE(IsPrime(INT_MIN));

  // Tests some trivial cases.

  EXPECT_FALSE(IsPrime(0));

  EXPECT_FALSE(IsPrime(1));

  EXPECT_TRUE(IsPrime(2));

  EXPECT_TRUE(IsPrime(3));

  // Tests positive input.

  EXPECT_FALSE(IsPrime(4));

  EXPECT_TRUE(IsPrime(5));

  EXPECT_FALSE(IsPrime(6));

  EXPECT_TRUE(IsPrime(23));

}

// The next test case (named "QueueTest") also needs to be quick, so

// we derive another fixture from QuickTest.

//

// The QueueTest test fixture has some logic and shared objects in

// addition to what's in QuickTest already.  We define the additional

// stuff inside the body of the test fixture, as usual.

class QueueTest : public QuickTest {

 protected:

  virtual void SetUp() {

    // First, we need to set up the super fixture (QuickTest).

    QuickTest::SetUp();

    // Second, some additional setup for this fixture.

    q1_.Enqueue(1);

    q2_.Enqueue(2);

    q2_.Enqueue(3);

  }

  // By default, TearDown() inherits the behavior of

  // QuickTest::TearDown().  As we have no additional cleaning work

  // for QueueTest, we omit it here.

  //

  // virtual void TearDown() {

  //   QuickTest::TearDown();

  // }

  Queue<int> q0_;

  Queue<int> q1_;

  Queue<int> q2_;

};

// Now, let's write tests using the QueueTest fixture.

// Tests the default constructor.

TEST_F(QueueTest, DefaultConstructor) {

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

}

// Tests Dequeue().

TEST_F(QueueTest, Dequeue) {

  int* n = q0_.Dequeue();

  EXPECT_TRUE(n == NULL);

  n = q1_.Dequeue();

  EXPECT_TRUE(n != NULL);

  EXPECT_EQ(1, *n);

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

  delete n;

  n = q2_.Dequeue();

  EXPECT_TRUE(n != NULL);

  EXPECT_EQ(2, *n);

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

  delete n;

}

// If necessary, you can derive further test fixtures from a derived

// fixture itself.  For example, you can derive another fixture from

// QueueTest.  Google Test imposes no limit on how deep the hierarchy

// can be.  In practice, however, you probably don't want it to be too

// deep as to be confusing.