I'm using gtest (google's testing framework), and use the following code for my test fixtures:

#define TEST_NAME test_foo

TEST( TEST_NAME, bar )
{
    reset_ports();
    /* test body begins here */
}

The function reset_ports is part of some very primitive micro controller hardware emulation code, and I'd like it to be called between every test fixture to ensure a clean state. I tried writing a small macro for doing this for me, but I can't get it to work:

#define BEGIN(x) (TEST((TEST_NAME), (x)) { reset_ports();)
#define END }

BEGIN( bar )
    /* test body begins here */
END

The errors I'm getting are:

error: pasting ")" and "_" does not give a valid preprocessing token|
error: pasting "_" and "(" does not give a valid preprocessing token|
error: pasting ")" and "_Test" does not give a valid preprocessing token|
error: pasting ")" and "_" does not give a valid preprocessing token|
error: pasting "_" and "(" does not give a valid preprocessing token|
error: pasting ")" and "_Test" does not give a valid preprocessing token|
error: pasting ")" and "_" does not give a valid preprocessing token|
...

Any help? I've not practiced my preprocessor-voodoo enough to understand what's wrong.

UPDATE

The following appears to be closer to solving the problem:

#define TEST_NAME test_regulator_getters_and_setters
#define BEGIN(x) (TEST(TEST_NAME, x)) { reset_ports();
#define END }

Now I'm only getting two errors:

error: expected unqualified-id before 'class'|
error: expected ')' before 'class'|

Also some more helpful information: the TEST macro is defined as:

#define GTEST_TEST(test_case_name, test_name)\
  GTEST_TEST_(test_case_name, test_name, \
              ::testing::Test, ::testing::internal::GetTestTypeId())

#if !GTEST_DONT_DEFINE_TEST
# define TEST(test_case_name, test_name) GTEST_TEST(test_case_name, test_name)
#endif

Looks to me like you're trying to reinvent, using a 1960's era text processor, what's already available in the test fixture SetUp() and TearDown() function. Have you tried using those to set up and tear down your fixture instead?

Exactly what I was looking for, thanks!