开发时候，先写测试是个好习惯，就算不是正式意义上的测试驱动开发，也对开发质量有明显提升。C++开发写测试代码，几种工具里面，我最喜欢gTest. 初上手时，以为它不能选择部分用例单独执行，其实它是提供了这功能的，可以先简单的做到。
假定写了下面这样若干测试用例。
------------------------------------------------------
TEST(case1, functionA_test） {
....
}
TEST(case1, functionB_test） {
....
}
TEST(case2, functionA_test) {
.....
}
TEST(case2, functionB_test){
....
}
TEST(case3, functionA_test) {
....
}
再假定编译出来的程序名test.exe,
比如我们现在想要只跑case2这几个测试，那么一个命令行参数就可以搞定：
--gtest_filter=case2.*
如果想在VS集成环境运行，那么就把这一串加进命令参数：
配置属性=〉调试=〉命令参数 设置
---------------------------------
其实在命令行带/？参数执行编译好的测试程序，就知道gTest这些开关：
附在下面
----------------------------------
This program contains tests written using Google Test. You can use the
following command line flags to control its behavior:
Test Selection:
--gtest_list_tests
List the names of all tests instead of running them. The name of
TEST(Foo, Bar) is "Foo.Bar".
--gtest_filter=POSTIVE_PATTERNS[-NEGATIVE_PATTERNS]
Run only the tests whose name matches one of the positive patterns but
none of the negative patterns. '?' matches any single character; '*'
matches any substring; ':' separates two patterns.
--gtest_also_run_disabled_tests
Run all disabled tests too.
Test Execution:
--gtest_repeat=[COUNT]
Run the tests repeatedly; use a negative count to repeat forever.
--gtest_shuffle
Randomize tests' orders on every iteration.
--gtest_random_seed=[NUMBER]
Random number seed to use for shuffling test orders (between 1 and
99999, or 0 to use a seed based on the current time).
Test Output:
--gtest_color=(yes|no|auto)
Enable/disable colored output. The default is auto.
--gtest_print_time=0
Don't print the elapsed time of each test.
--gtest_output=xml[:DIRECTORY_PATH\|:FILE_PATH]
Generate an XML report in the given directory or with the given file
name. FILE_PATH defaults to test_details.xml.
Assertion Behavior:
--gtest_break_on_failure
Turn assertion failures into debugger break-points.
--gtest_throw_on_failure
Turn assertion failures into C++ exceptions.
--gtest_catch_exceptions=0
Do not report exceptions as test failures. Instead, allow them
to crash the program or throw a pop-up (on Windows).
Except for --gtest_list_tests, you can alternatively set the corresponding
environment variable of a flag (all letters in upper-case). For example, to
disable colored text output, you can either specify --gtest_color=no or set
the GTEST_COLOR environment variable to no.
For more information, please read the Google Test documentation at
http://code.google.com/p/googletest/. If you find a bug in Google Test
(not one in your own code or tests), please report it to
<[email protected]>.