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Global fixture

Any global initialization that needs to be performed before any test begins, or a cleanup that is to be performed after all tests are finished is called a global fixture. A global fixture is equivalent to a test-suite entry/exit fixture (executed once), where in this case the test-suite is the master test suite.

The Unit Test Framework global fixture design is based on the generic test class fixture model. The global fixture design allows any number of global fixtures to be defined in any test file that constitutes a test module. Though some initialization can be implemented in the test module initialization function, there are several reasons to prefer the global fixture approach:

To define a global test module fixture you need:

  1. to implement a class that matches the fixture model
  2. and to pass the class as an argument to the macro BOOST_TEST_GLOBAL_FIXTURE.

The statement, that performs global fixture definition, has to reside at a test file scope.

Example: Global fixture


#define BOOST_TEST_MODULE fixture_04
#include <boost/test/included/unit_test.hpp>

struct MyGlobalFixture {
  MyGlobalFixture() {
      BOOST_TEST_MESSAGE( "ctor fixture i=" << i );
  void setup() {
      BOOST_TEST_MESSAGE( "setup fixture i=" << i );
  void teardown() {
      BOOST_TEST_MESSAGE( "teardown fixture i=" << i );
      i += 2;
  ~MyGlobalFixture() {
      BOOST_TEST_MESSAGE( "dtor fixture i=" << i );
  static int i;
int MyGlobalFixture::i = 0;


  BOOST_TEST_MESSAGE("running test_case1");
  BOOST_TEST(MyGlobalFixture::i == 1);

  BOOST_TEST_MESSAGE("running test_case2");
  BOOST_TEST(MyGlobalFixture::i == 3);


> fixture_04 --log_level=message
Running 2 test cases...
ctor fixture i=0
setup fixture i=0
running test_case1
running test_case2
./ error: in "test_case2": check MyGlobalFixture::i == 3 has failed [1 != 3]
teardown fixture i=1
dtor fixture i=3

*** 1 failure is detected in the test module "fixture_04"