Report Hooks

Report hooks are functions that are called at key moments during the testing process. These are useful to report statistics gathered during the execution.

A report hook can be declared using the ReportHook macro:

#include <criterion/criterion.h>
#include <criterion/hooks.h>

ReportHook(Phase)() {

The macro takes a Phase parameter that indicates the phase at which the function shall be run. Valid phases are described below.


There are no guarantees regarding the order of execution of report hooks on the same phase. In other words, all report hooks of a specific phase could be executed in any order.


Aborting the runner with any means (abort(), exit(), cr_assert(), ...) is unsupported. If you need to abort the runner, you need to iterate all subsequent tests and set their disabled field to 1.

Testing Phases

The flow of the test process goes as follows:

  1. PRE_ALL: occurs before running the tests.
  2. PRE_SUITE: occurs before a suite is initialized.
  3. PRE_INIT: occurs before a test is initialized.
  4. PRE_TEST: occurs after the test initialization, but before the test is run.
  5. ASSERT: occurs when an assertion is hit
  6. THEORY_FAIL: occurs when a theory iteration fails.
  7. TEST_CRASH: occurs when a test crashes unexpectedly.
  8. POST_TEST: occurs after a test ends, but before the test finalization.
  9. POST_FINI: occurs after a test finalization.
  10. POST_SUITE: occurs before a suite is finalized.
  11. POST_ALL: occurs after all the tests are done.

Hook Parameters

A report hook takes exactly one parameter. Valid types for each phases are:

  • struct criterion_test_set * for PRE_ALL.
  • struct criterion_suite_set * for PRE_SUITE.
  • struct criterion_test * for PRE_INIT and PRE_TEST.
  • struct criterion_assert_stats * for ASSERT.
  • struct criterion_theory_stats * for THEORY_FAIL.
  • struct criterion_test_stats * for POST_TEST, POST_FINI, and TEST_CRASH.
  • struct criterion_suite_stats * for POST_SUITE.
  • struct criterion_global_stats * for POST_ALL.

For instance, this is a valid report hook declaration for the PRE_TEST phase:

#include <criterion/criterion.h>
#include <criterion/hooks.h>

ReportHook(PRE_TEST)(struct criterion_test *test) {
    // using the parameter