0.?引子

?

本例是從?gtest-1.5.0?自帶的?sample?中的?sample1?改寫而來，筆者只添加了一個求?n?的階層的函數，如下。

void?Factorial(int?n,?int?&?result?)

{

????result = 1;

????for?(int?i = 1; i <= n; i++)

????????result *= i;

}

目的是想測試像這樣將返回值放在參數中返回的函數。

對于該函數，添加的單元測試代碼如下。

TEST?(FactorialTest?,?Mytest?)

{

????int?result = 0;

????Factorial?(5, result);

????EXPECT_EQ?(120, result);

}

1.?要測試的代碼

?

要測試的代碼?(Sample.h)?代碼如下。

[c-sharp]?view plaincopy

/**?

?*?GoogleTest?test?

?*?platform:?win32,?visual?studio?2005/2010;?Linux,?gcc4.1.2?

?*/??

#ifndef?_SAMPLE_H_??

#define?_SAMPLE_H_??

//?Returns?n!?(the?factorial?of?n).??For?negative?n,?n!?is?defined?to?be?1.??

int?Factorial(int?n);??

void?Factorial(int?n,?int?&result);??

//?Returns?true?iff?n?is?a?prime?number.??

bool?IsPrime(int?n);??

#endif??

要測試的代碼?(Sample.cpp)?代碼如下。

[cpp]?view plaincopy

/**?

?*?GoogleTest?test?

?*?platform:?win32,?visual?studio?2005/2010;?Linux,?gcc4.1.2?

?*/??

#include?"sample.h"??

//?Returns?n!?(the?factorial?of?n).??For?negative?n,?n!?is?defined?to?be?1.??

int?Factorial(int?n)??

{??

????int?result?=?1;??

????for?(int?i?=?1;?i?<=?n;?i++)??

????????result?*=?i;??

????return?result;??

}??

void?Factorial(int?n,?int?&result)??

{??

????result?=?1;??

????for?(int?i?=?1;?i?<=?n;?i++)??

????????result?*=?i;??

}??

??

//?Returns?true?iff?n?is?a?prime?number.??

bool?IsPrime(int?n)??

{??

????//?Trivial?case?1:?small?numbers??

????if?(n?<=?1)??

????????return?false;??

????//?Trivial?case?2:?even?numbers??

????if?(n?%?2?==?0)??

????????return?n==2;??

????//?Now,?we?have?that?n?is?odd?and?n?>=?3.??

????//?Try?to?divide?n?by?every?odd?number?i,?starting?from?3??

????for?(int?i?=?3;?;?i?+=?2)??

????{??

????????//?We?only?have?to?try?i?up?to?the?squre?root?of?n??

????????if?(i?>?n/i)??

????????????break;??

????????//?Now,?we?have?i?<=?n/i?<?n.??

????????//?If?n?is?divisible?by?i,?n?is?not?prime.??

????????if?(n?%?i?==?0)??

????????????return?false;??

????}??

????//?n?has?no?integer?factor?in?the?range?(1,?n),?and?thus?is?prime.??

????return?true;??

}??

2.?單元測試代碼

?

單元測試代碼?(test.cpp)?如下。

[cpp]?view plaincopy

/**?

?*?GoogleTest?test?

?*?platform:?win32,?visual?studio?2005/2010;?Linux,?gcc4.1.2?

?*/??

#include?"sample.h"??

#include?<gtest/gtest.h>??

//?Step?2.?Use?the?TEST?macro?to?define?your?tests.??

//?Tests?Factorial().??

//?Tests?factorial?of?negative?numbers.??

//?Test?Case?name?is?FactorialTest,?Test?name?is?Negative??

TEST(FactorialTest,?Negative)??

{??

????EXPECT_EQ(1,?Factorial(-5));??

????EXPECT_EQ(1,?Factorial(-1));??

????EXPECT_TRUE(Factorial(-10)?>?0);??

}??

//?Tests?factorial?of?0.??

TEST(FactorialTest,?Zero)??

{??

????EXPECT_EQ(1,?Factorial(0));??

}??

//?Tests?factorial?of?positive?numbers.??

TEST(FactorialTest,?Positive)??

{??

????EXPECT_EQ(1,?Factorial(1));??

????EXPECT_EQ(2,?Factorial(2));??

????EXPECT_EQ(6,?Factorial(3));??

????EXPECT_EQ(40320,?Factorial(8));??

}??

TEST(FactorialTest,?Mytest)??

{??

????int?result?=?0;??

????Factorial(5,?result);??

????EXPECT_EQ(120,?result);??

}??

//?Tests?IsPrime()??

//?Tests?negative?input.??

TEST(IsPrimeTest,?Negative)??

{??

????EXPECT_FALSE(IsPrime(-1));??

????EXPECT_FALSE(IsPrime(-2));??

????EXPECT_FALSE(IsPrime(INT_MIN));??

}??

//?Tests?some?trivial?cases.??

TEST(IsPrimeTest,?Trivial)??

{??

????EXPECT_FALSE(IsPrime(0));??

????EXPECT_FALSE(IsPrime(1));??

????EXPECT_TRUE(IsPrime(2));??

????EXPECT_TRUE(IsPrime(3));??

}??

//?Tests?positive?input.??

TEST(IsPrimeTest,?Positive)??

{??

????EXPECT_FALSE(IsPrime(4));??

????EXPECT_TRUE(IsPrime(5));??

????EXPECT_FALSE(IsPrime(6));??

????EXPECT_TRUE(IsPrime(23));??

}??

??

//?Step?3.?Call?RUN_ALL_TESTS()?in?main().??

//??

//?We?do?this?by?linking?in?src/gtest_main.cc?file,?which?consists?of??

//?a?main()?function?which?calls?RUN_ALL_TESTS()?for?us.??

//??

//?This?runs?all?the?tests?you've?defined,?prints?the?result,?and??

//?returns?0?if?successful,?or?1?otherwise.??

//??

//?Did?you?notice?that?we?didn't?register?the?tests???The??

//?RUN_ALL_TESTS()?macro?magically?knows?about?all?the?tests?we??

//?defined.??Isn't?this?convenient???

3.?編譯

?

3.1 Linux?平臺

?

makefile?文件，請參考?“?Linux平臺如何編譯使用Google test寫的單元測試？?”

?

3.2 Win32?平臺

?

Make.bat?文件，請參考?“?Win32?平臺如何編譯使用?Google test?編?寫的單元測試？?”?。

?

4.?運行結果

?

4.1 Linux?平臺

?

運行結果如下。

# ./test

Running main() from gtest_main.cc

[==========] Running 7 tests from 2 test cases.

[----------] Global test environment set-up.

[----------] 4 tests from FactorialTest

[ RUN??????] FactorialTest.Negative

[???????OK ] FactorialTest.Negative (0 ms)

[ RUN??????] FactorialTest.Zero

[???????OK ] FactorialTest.Zero (0 ms)

[ RUN??????] FactorialTest.Positive

[???????OK ] FactorialTest.Positive (0 ms)

[ RUN??????] FactorialTest.Mytest

[???????OK ] FactorialTest.Mytest (0 ms)

[----------] 4 tests from FactorialTest (0 ms total)

?

[----------] 3 tests from IsPrimeTest

[ RUN??????] IsPrimeTest.Negative

[???????OK ] IsPrimeTest.Negative (0 ms)

[ RUN??????] IsPrimeTest.Trivial

[???????OK ] IsPrimeTest.Trivial (0 ms)

[ RUN??????] IsPrimeTest.Positive

[???????OK ] IsPrimeTest.Positive (0 ms)

[----------] 3 tests from IsPrimeTest (0 ms total)

?

[----------] Global test environment tear-down

[==========] 7 tests from 2 test cases ran. (0 ms total)

[??PASSED??] 7 tests.

7?個測試均通過。

?

4.2 Win32?平臺

?

運行結果如下。

?

?

總結

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