[Boost-users] [Test] Global Fixtures

2 Oct 2014

      I am trying to use global fixtures in my tests but I may be misinterpreting
the documentations. The following toy example doesn't work :

#include <boost/test/unit_test.hpp>

struct TruthFixture {
  int x = 3;

  int f (int a) {
    return a + 3;
  }
};

BOOST_GLOBAL_FIXTURE( TruthFixture )

BOOST_AUTO_TEST_CASE(test_variable) {
  printf("x = %d\n", x);
}

BOOST_AUTO_TEST_CASE(test_function) {
  printf("f(2) = %d\n", f(2));
}

the error message I get is the following:

test/test.cpp:14:22: error: use of undeclared identifier 'x'; did you mean
'TruthFixture::x'?
  printf("x = %d\n", x);
                     ^
                     TruthFixture::x
test/test.cpp:4:7: note: 'TruthFixture::x' declared here
  int x = 3;
      ^
test/test.cpp:14:22: error: invalid use of non-static data member 'x'
  printf("x = %d\n", x);
                     ^
test/test.cpp:18:25: error: use of undeclared identifier 'f'; did you mean
'TruthFixture::f'?
  printf("f(2) = %d\n", f(2));
                        ^
                        TruthFixture::f
test/test.cpp:6:7: note: 'TruthFixture::f' declared here
  int f (int a) {
      ^
test/test.cpp:18:25: error: call to non-static member function without an
object argument
  printf("f(2) = %d\n", f(2));
                        ^
4 errors generated.

clearly the BOOST_GLOBAL_FIXTURE declaration is not doing anything.

But if I drop the global fixture declaration and revert to the per function
declaration, it works:
#include <boost/test/unit_test.hpp>

struct TruthFixture {
  int x = 3;

  int f (int a) {
    return a + 3;
  }
};

BOOST_FIXTURE_TEST_CASE(test_variable, TruthFixture) {
  printf("x = %d\n", x);
}

BOOST_FIXTURE_TEST_CASE(test_function, TruthFixture) {
  printf("f(2) = %d\n", f(2));
}

then everything works perfectly as intended.

Any input on what I am doing wrong with the *global* fixture declaration?
Thank you!

Mauricio Carneiro, Ph.D.
http://www.broadinstitute.org/~carneiro/