使用Google Test的一个简单例子(接合上一篇看)

水深无声 2022-06-17 07:26 104阅读 0赞

0. 引子

本例是从 gtest-1.5.0 自带的 sample 中的 sample1 改写而来，笔者只添加了一个求 n 的阶层的函数，如下。

> void Factorial(int n, **int** **&** **result** )
> 
> \{
> 
> result = 1;
> 
> for (int i = 1; i <= n; i++)
> 
> result \*= i;
> 
> \}

目的是想[测试][Link 1]像这样将返回值放在参数中返回的函数。

对于该函数，添加的单元测试代码如下。

> TEST (FactorialTest , Mytest )
> 
> \{
> 
> int result = 0;
> 
> Factorial (5, result);
> 
> EXPECT\_EQ (120, result);
> 
> \}

1. 要测试的代码

要测试的代码 (Sample.h) 代码如下。

**\[c-sharp\]** [view plain][] [copy][view plain]

1.  /\*\*
2.   \* GoogleTest test
3.   \* platform: win32, visual studio 2005/2010; <a href="http://lib.csdn.net/base/linux" class='replace\_word' title="Linux知识库" target='\_blank' style='color:\#df3434; font-weight:bold;'>Linux</a>, gcc4.1.2
4.   \*/
5.  \#ifndef \_SAMPLE\_H\_
6.  \#define \_SAMPLE\_H\_
7.  // Returns n! (the factorial of n). For negative n, n! is defined to be 1.
8.  **int** Factorial(**int** n); 
9.  **void** Factorial(**int** n, **int** &result); 
10. // Returns true iff n is a prime number.
11. **bool** IsPrime(**int** n); 
12. \#endif

要测试的代码 (Sample.cpp) 代码如下。

**\[cpp\]** [view plain][] [copy][view plain]

1.  /\*\*
2.   \* GoogleTest test
3.   \* platform: win32, visual studio 2005/2010; Linux, gcc4.1.2
4.   \*/
5.  \#include "sample.h"
6.  // Returns n! (the factorial of n). For negative n, n! is defined to be 1.
7.  **int** Factorial(**int** n) 
8.  \{ 
9.  **int** result = 1; 
10. **for** (**int** i = 1; i <= n; i++) 
11.  result \*= i; 
12. **return** result; 
13. \} 
14. **void** Factorial(**int** n, **int** &result) 
15. \{ 
16.  result = 1; 
17. **for** (**int** i = 1; i <= n; i++) 
18.  result \*= i; 
19. \} 
20. 
21. // Returns true iff n is a prime number.
22. **bool** IsPrime(**int** n) 
23. \{ 
24. // Trivial case 1: small numbers
25. **if** (n <= 1) 
26. **return****false**; 
27. // Trivial case 2: even numbers
28. **if** (n % 2 == 0) 
29. **return** n==2; 
30. // Now, we have that n is odd and n >= 3.
31. // Try to divide n by every odd number i, starting from 3
32. **for** (**int** i = 3; ; i += 2) 
33.  \{ 
34. // We only have to try i up to the squre root of n
35. **if** (i > n/i) 
36. **break**; 
37. // Now, we have i <= n/i < n.
38. // If n is divisible by i, n is not prime.
39. **if** (n % i == 0) 
40. **return****false**; 
41.  \} 
42. // n has no integer factor in the range (1, n), and thus is prime.
43. **return****true**; 
44. \}

2. 单元测试代码

单元测试代码 (test.cpp) 如下。

**\[cpp\]** [view plain][] [copy][view plain]

1.  /\*\*
2.   \* GoogleTest test
3.   \* platform: win32, visual studio 2005/2010; Linux, gcc4.1.2
4.   \*/
5.  \#include "sample.h"
6.  \#include <gtest/gtest.h>
7.  // Step 2. Use the TEST macro to define your tests.
8.  // Tests Factorial().
9.  // Tests factorial of negative numbers.
10. // Test Case name is FactorialTest, Test name is Negative
11. TEST(FactorialTest, Negative) 
12. \{ 
13.  EXPECT\_EQ(1, Factorial(-5)); 
14.  EXPECT\_EQ(1, Factorial(-1)); 
15.  EXPECT\_TRUE(Factorial(-10) > 0); 
16. \} 
17. // Tests factorial of 0.
18. TEST(FactorialTest, Zero) 
19. \{ 
20.  EXPECT\_EQ(1, Factorial(0)); 
21. \} 
22. // Tests factorial of positive numbers.
23. TEST(FactorialTest, Positive) 
24. \{ 
25.  EXPECT\_EQ(1, Factorial(1)); 
26.  EXPECT\_EQ(2, Factorial(2)); 
27.  EXPECT\_EQ(6, Factorial(3)); 
28.  EXPECT\_EQ(40320, Factorial(8)); 
29. \} 
30. TEST(FactorialTest, Mytest) 
31. \{ 
32. **int** result = 0; 
33.  Factorial(5, result); 
34.  EXPECT\_EQ(120, result); 
35. \} 
36. // Tests IsPrime()
37. // Tests negative input.
38. TEST(IsPrimeTest, Negative) 
39. \{ 
40.  EXPECT\_FALSE(IsPrime(-1)); 
41.  EXPECT\_FALSE(IsPrime(-2)); 
42.  EXPECT\_FALSE(IsPrime(INT\_MIN)); 
43. \} 
44. // Tests some trivial cases.
45. TEST(IsPrimeTest, Trivial) 
46. \{ 
47.  EXPECT\_FALSE(IsPrime(0)); 
48.  EXPECT\_FALSE(IsPrime(1)); 
49.  EXPECT\_TRUE(IsPrime(2)); 
50.  EXPECT\_TRUE(IsPrime(3)); 
51. \} 
52. // Tests positive input.
53. TEST(IsPrimeTest, Positive) 
54. \{ 
55.  EXPECT\_FALSE(IsPrime(4)); 
56.  EXPECT\_TRUE(IsPrime(5)); 
57.  EXPECT\_FALSE(IsPrime(6)); 
58.  EXPECT\_TRUE(IsPrime(23)); 
59. \} 
60. 
61. // Step 3. Call RUN\_ALL\_TESTS() in main().
62. //
63. // We do this by linking in src/gtest\_main.cc file, which consists of
64. // a main() function which calls RUN\_ALL\_TESTS() for us.
65. //
66. // This runs all the tests you've defined, prints the result, and
67. // returns 0 if successful, or 1 otherwise.
68. //
69. // Did you notice that we didn't register the tests? The
70. // RUN\_ALL\_TESTS() macro magically knows about all the tests we
71. // defined. Isn't this convenient?

3. 编译

3.1 Linux 平台

makefile 文件，请参考 [“ Linux平台如何编译使用Google test写的单元测试？ ”][Linux_Google test_]

3.2 Win32 平台

Make.bat 文件，请参考 [“ Win32 平台如何编译使用 Google test 编 写的单元测试？ ” ][Win32 _ Google test _ _ _]。

4. 运行结果

4.1 Linux 平台

运行结果如下。

> \# ./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 个测试均通过。

4.2 Win32 平台

运行结果如下。

![0_12952771588xx0.gif][]

Technorati 标签: [单元测试；google test][google test]

网址：http://blog.csdn.net/livelylittlefish/article/details/6148171

[Link 1]: http://lib.csdn.net/base/softwaretest
[view plain]: http://blog.csdn.net/livelylittlefish/article/details/6148171#
[Linux_Google test_]: http://blog.csdn.net/livelylittlefish/archive/2011/01/16/6143559.aspx
[Win32 _ Google test _ _ _]: http://blog.csdn.net/livelylittlefish/archive/2011/01/17/6148133.aspx
[0_12952771588xx0.gif]: /images/20220617/bfc8ef2122574987936eae750ad6c8bb.png
[google test]: http://technorati.com/tag/%E5%8D%95%E5%85%83%E6%B5%8B%E8%AF%95%EF%BC%9Bgoogle%20test