g_test_init (
  int* argc,
  char*** argv,


Initialize the GLib testing framework, e.g. by seeding the test random number generator, the name for g_get_prgname() and parsing test related command line args.

So far, the following arguments are understood:

  • -l: List test cases available in a test executable.
  • --seed=SEED: Provide a random seed to reproduce test runs using random numbers.
  • --verbose: Run tests verbosely.
  • -q, --quiet: Run tests quietly.
  • -p PATH: Execute all tests matching the given path.
  • -s PATH: Skip all tests matching the given path. This can also be used to force a test to run that would otherwise be skipped (ie, a test whose name contains “/subprocess”).
  • -m {perf|slow|thorough|quick|undefined|no-undefined}: Execute tests according to these test modes:

perf: Performance tests, may take long and report results (off by default).

slow, thorough: Slow and thorough tests, may take quite long and maximize coverage (off by default).

quick: Quick tests, should run really quickly and give good coverage (the default).

undefined: Tests for undefined behaviour, may provoke programming errors under g_test_trap_subprocess() or g_test_expect_message() to check that appropriate assertions or warnings are given (the default).

no-undefined: Avoid tests for undefined behaviour

  • --debug-log: Debug test logging output.

Options which can be passed to @… are:

  • "no_g_set_prgname": Causes g_test_init() to not call g_set_prgname().
  • G_TEST_OPTION_ISOLATE_DIRS: Creates a unique temporary directory for each unit test and uses g_set_user_dirs() to set XDG directories to point into that temporary directory for the duration of the unit test. See the documentation for G_TEST_OPTION_ISOLATE_DIRS.

Since 2.58, if tests are compiled with G_DISABLE_ASSERT defined, g_test_init() will print an error and exit. This is to prevent no-op tests from being executed, as g_assert() is commonly (erroneously) used in unit tests, and is a no-op when compiled with G_DISABLE_ASSERT. Ensure your tests are compiled without G_DISABLE_ASSERT defined.

Available since:2.16


argc int*

Address of the argc parameter of the main() function. Changed if any arguments were handled.

 The data is owned by the caller of the function.
argv char***

Address of the argv parameter of main(). Any parameters understood by g_test_init() stripped before return.

 The data is owned by the caller of the function.
 The string is a NUL terminated UTF-8 string.
... none

NULL-terminated list of special options, documented below.