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30// Author: wan@google.com (Zhanyong Wan)
31
32// This sample teaches how to reuse a test fixture in multiple test
33// cases by deriving sub-fixtures from it.
34//
35// When you define a test fixture, you specify the name of the test
36// case that will use this fixture.  Therefore, a test fixture can
37// be used by only one test case.
38//
39// Sometimes, more than one test cases may want to use the same or
40// slightly different test fixtures.  For example, you may want to
41// make sure that all tests for a GUI library don't leak important
42// system resources like fonts and brushes.  In Google Test, you do
43// this by putting the shared logic in a super (as in "super class")
44// test fixture, and then have each test case use a fixture derived
45// from this super fixture.
46
47#include <limits.h>
48#include <time.h>
49#include "sample3-inl.h"
50#include "gtest/gtest.h"
51#include "sample1.h"
52
53// In this sample, we want to ensure that every test finishes within
54// ~5 seconds.  If a test takes longer to run, we consider it a
55// failure.
56//
57// We put the code for timing a test in a test fixture called
58// "QuickTest".  QuickTest is intended to be the super fixture that
59// other fixtures derive from, therefore there is no test case with
60// the name "QuickTest".  This is OK.
61//
62// Later, we will derive multiple test fixtures from QuickTest.
63class QuickTest : public testing::Test {
64 protected:
65  // Remember that SetUp() is run immediately before a test starts.
66  // This is a good place to record the start time.
67  virtual void SetUp() {
68    start_time_ = time(NULL);
69  }
70
71  // TearDown() is invoked immediately after a test finishes.  Here we
72  // check if the test was too slow.
73  virtual void TearDown() {
74    // Gets the time when the test finishes
75    const time_t end_time = time(NULL);
76
77    // Asserts that the test took no more than ~5 seconds.  Did you
78    // know that you can use assertions in SetUp() and TearDown() as
79    // well?
80    EXPECT_TRUE(end_time - start_time_ <= 5) << "The test took too long.";
81  }
82
83  // The UTC time (in seconds) when the test starts
84  time_t start_time_;
85};
86
87
88// We derive a fixture named IntegerFunctionTest from the QuickTest
89// fixture.  All tests using this fixture will be automatically
90// required to be quick.
91class IntegerFunctionTest : public QuickTest {
92  // We don't need any more logic than already in the QuickTest fixture.
93  // Therefore the body is empty.
94};
95
96
97// Now we can write tests in the IntegerFunctionTest test case.
98
99// Tests Factorial()
100TEST_F(IntegerFunctionTest, Factorial) {
101  // Tests factorial of negative numbers.
102  EXPECT_EQ(1, Factorial(-5));
103  EXPECT_EQ(1, Factorial(-1));
104  EXPECT_GT(Factorial(-10), 0);
105
106  // Tests factorial of 0.
107  EXPECT_EQ(1, Factorial(0));
108
109  // Tests factorial of positive numbers.
110  EXPECT_EQ(1, Factorial(1));
111  EXPECT_EQ(2, Factorial(2));
112  EXPECT_EQ(6, Factorial(3));
113  EXPECT_EQ(40320, Factorial(8));
114}
115
116
117// Tests IsPrime()
118TEST_F(IntegerFunctionTest, IsPrime) {
119  // Tests negative input.
120  EXPECT_FALSE(IsPrime(-1));
121  EXPECT_FALSE(IsPrime(-2));
122  EXPECT_FALSE(IsPrime(INT_MIN));
123
124  // Tests some trivial cases.
125  EXPECT_FALSE(IsPrime(0));
126  EXPECT_FALSE(IsPrime(1));
127  EXPECT_TRUE(IsPrime(2));
128  EXPECT_TRUE(IsPrime(3));
129
130  // Tests positive input.
131  EXPECT_FALSE(IsPrime(4));
132  EXPECT_TRUE(IsPrime(5));
133  EXPECT_FALSE(IsPrime(6));
134  EXPECT_TRUE(IsPrime(23));
135}
136
137
138// The next test case (named "QueueTest") also needs to be quick, so
139// we derive another fixture from QuickTest.
140//
141// The QueueTest test fixture has some logic and shared objects in
142// addition to what's in QuickTest already.  We define the additional
143// stuff inside the body of the test fixture, as usual.
144class QueueTest : public QuickTest {
145 protected:
146  virtual void SetUp() {
147    // First, we need to set up the super fixture (QuickTest).
148    QuickTest::SetUp();
149
150    // Second, some additional setup for this fixture.
151    q1_.Enqueue(1);
152    q2_.Enqueue(2);
153    q2_.Enqueue(3);
154  }
155
156  // By default, TearDown() inherits the behavior of
157  // QuickTest::TearDown().  As we have no additional cleaning work
158  // for QueueTest, we omit it here.
159  //
160  // virtual void TearDown() {
161  //   QuickTest::TearDown();
162  // }
163
164  Queue<int> q0_;
165  Queue<int> q1_;
166  Queue<int> q2_;
167};
168
169
170// Now, let's write tests using the QueueTest fixture.
171
172// Tests the default constructor.
173TEST_F(QueueTest, DefaultConstructor) {
174  EXPECT_EQ(0u, q0_.Size());
175}
176
177// Tests Dequeue().
178TEST_F(QueueTest, Dequeue) {
179  int* n = q0_.Dequeue();
180  EXPECT_TRUE(n == NULL);
181
182  n = q1_.Dequeue();
183  EXPECT_TRUE(n != NULL);
184  EXPECT_EQ(1, *n);
185  EXPECT_EQ(0u, q1_.Size());
186  delete n;
187
188  n = q2_.Dequeue();
189  EXPECT_TRUE(n != NULL);
190  EXPECT_EQ(2, *n);
191  EXPECT_EQ(1u, q2_.Size());
192  delete n;
193}
194
195// If necessary, you can derive further test fixtures from a derived
196// fixture itself.  For example, you can derive another fixture from
197// QueueTest.  Google Test imposes no limit on how deep the hierarchy
198// can be.  In practice, however, you probably don't want it to be too
199// deep as to be confusing.
200