200 lines
6.5 KiB
C++
200 lines
6.5 KiB
C++
// Copyright 2005, Google Inc.
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// Author: wan@google.com (Zhanyong Wan)
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// This sample teaches how to reuse a test fixture in multiple test
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// cases by deriving sub-fixtures from it.
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//
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// When you define a test fixture, you specify the name of the test
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// case that will use this fixture. Therefore, a test fixture can
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// be used by only one test case.
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//
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// Sometimes, more than one test cases may want to use the same or
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// slightly different test fixtures. For example, you may want to
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// make sure that all tests for a GUI library don't leak important
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// system resources like fonts and brushes. In Google Test, you do
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// this by putting the shared logic in a super (as in "super class")
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// test fixture, and then have each test case use a fixture derived
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// from this super fixture.
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#include <limits.h>
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#include <time.h>
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#include "gtest/gtest.h"
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#include "sample1.h"
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#include "sample3-inl.h"
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namespace {
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// In this sample, we want to ensure that every test finishes within
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// ~5 seconds. If a test takes longer to run, we consider it a
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// failure.
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//
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// We put the code for timing a test in a test fixture called
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// "QuickTest". QuickTest is intended to be the super fixture that
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// other fixtures derive from, therefore there is no test case with
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// the name "QuickTest". This is OK.
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//
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// Later, we will derive multiple test fixtures from QuickTest.
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class QuickTest : public testing::Test {
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protected:
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// Remember that SetUp() is run immediately before a test starts.
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// This is a good place to record the start time.
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virtual void SetUp() {
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start_time_ = time(NULL);
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}
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// TearDown() is invoked immediately after a test finishes. Here we
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// check if the test was too slow.
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virtual void TearDown() {
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// Gets the time when the test finishes
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const time_t end_time = time(NULL);
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// Asserts that the test took no more than ~5 seconds. Did you
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// know that you can use assertions in SetUp() and TearDown() as
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// well?
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EXPECT_TRUE(end_time - start_time_ <= 5) << "The test took too long.";
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}
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// The UTC time (in seconds) when the test starts
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time_t start_time_;
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};
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// We derive a fixture named IntegerFunctionTest from the QuickTest
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// fixture. All tests using this fixture will be automatically
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// required to be quick.
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class IntegerFunctionTest : public QuickTest {
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// We don't need any more logic than already in the QuickTest fixture.
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// Therefore the body is empty.
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};
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// Now we can write tests in the IntegerFunctionTest test case.
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// Tests Factorial()
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TEST_F(IntegerFunctionTest, Factorial) {
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// Tests factorial of negative numbers.
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EXPECT_EQ(1, Factorial(-5));
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EXPECT_EQ(1, Factorial(-1));
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EXPECT_GT(Factorial(-10), 0);
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// Tests factorial of 0.
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EXPECT_EQ(1, Factorial(0));
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// Tests factorial of positive numbers.
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EXPECT_EQ(1, Factorial(1));
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EXPECT_EQ(2, Factorial(2));
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EXPECT_EQ(6, Factorial(3));
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EXPECT_EQ(40320, Factorial(8));
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}
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// Tests IsPrime()
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TEST_F(IntegerFunctionTest, IsPrime) {
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// Tests negative input.
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EXPECT_FALSE(IsPrime(-1));
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EXPECT_FALSE(IsPrime(-2));
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EXPECT_FALSE(IsPrime(INT_MIN));
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// Tests some trivial cases.
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EXPECT_FALSE(IsPrime(0));
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EXPECT_FALSE(IsPrime(1));
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EXPECT_TRUE(IsPrime(2));
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EXPECT_TRUE(IsPrime(3));
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// Tests positive input.
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EXPECT_FALSE(IsPrime(4));
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EXPECT_TRUE(IsPrime(5));
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EXPECT_FALSE(IsPrime(6));
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EXPECT_TRUE(IsPrime(23));
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}
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// The next test case (named "QueueTest") also needs to be quick, so
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// we derive another fixture from QuickTest.
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//
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// The QueueTest test fixture has some logic and shared objects in
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// addition to what's in QuickTest already. We define the additional
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// stuff inside the body of the test fixture, as usual.
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class QueueTest : public QuickTest {
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protected:
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virtual void SetUp() {
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// First, we need to set up the super fixture (QuickTest).
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QuickTest::SetUp();
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// Second, some additional setup for this fixture.
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q1_.Enqueue(1);
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q2_.Enqueue(2);
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q2_.Enqueue(3);
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}
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// By default, TearDown() inherits the behavior of
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// QuickTest::TearDown(). As we have no additional cleaning work
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// for QueueTest, we omit it here.
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//
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// virtual void TearDown() {
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// QuickTest::TearDown();
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// }
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Queue<int> q0_;
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Queue<int> q1_;
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Queue<int> q2_;
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};
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// Now, let's write tests using the QueueTest fixture.
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// Tests the default constructor.
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TEST_F(QueueTest, DefaultConstructor) {
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EXPECT_EQ(0u, q0_.Size());
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}
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// Tests Dequeue().
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TEST_F(QueueTest, Dequeue) {
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int* n = q0_.Dequeue();
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EXPECT_TRUE(n == NULL);
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n = q1_.Dequeue();
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EXPECT_TRUE(n != NULL);
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EXPECT_EQ(1, *n);
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EXPECT_EQ(0u, q1_.Size());
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delete n;
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n = q2_.Dequeue();
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EXPECT_TRUE(n != NULL);
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EXPECT_EQ(2, *n);
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EXPECT_EQ(1u, q2_.Size());
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delete n;
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}
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} // namespace
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// If necessary, you can derive further test fixtures from a derived
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// fixture itself. For example, you can derive another fixture from
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// QueueTest. Google Test imposes no limit on how deep the hierarchy
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// can be. In practice, however, you probably don't want it to be too
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// deep as to be confusing.
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