## Testing Testing — a test framework |

## Functions

void | g_test_minimized_result ()
void | g_test_maximized_result ()
void | g_test_init ()
#define | g_test_initialized
#define | g_test_quick
#define | g_test_slow
#define | g_test_thorough
#define | g_test_perf
#define | g_test_verbose
#define | g_test_undefined
#define | g_test_quiet
gboolean | g_test_subprocess ()
int | g_test_run ()
void | (*GTestFunc) ()
void | g_test_add_func ()
void | (*GTestDataFunc) ()
void | g_test_add_data_func ()
void | g_test_add_data_func_full ()
#define | g_test_add()
gchar * | g_test_build_filename ()
const gchar * | g_test_get_filename ()
const gchar * | g_test_get_dir ()
void | g_test_fail ()
void | g_test_skip ()
void | g_test_incomplete ()
gboolean | g_test_failed ()
void | g_test_message ()
void | g_test_bug_base ()
void | g_test_bug ()
gboolean | (*GTestLogFatalFunc) ()
void | g_test_log_set_fatal_handler ()
void | g_test_timer_start ()
double | g_test_timer_elapsed ()
double | g_test_timer_last ()
void | g_test_queue_free ()
void | g_test_queue_destroy ()
#define | g_test_queue_unref()
void | g_test_expect_message ()
#define | g_test_assert_expected_messages
void | g_test_trap_subprocess ()
gboolean | g_test_trap_has_passed ()
gboolean | g_test_trap_reached_timeout ()
#define | g_test_trap_assert_passed
#define | g_test_trap_assert_failed
#define | g_test_trap_assert_stdout()
#define | g_test_trap_assert_stdout_unmatched()
#define | g_test_trap_assert_stderr()
#define | g_test_trap_assert_stderr_unmatched()
gboolean | g_test_trap_fork ()
#define | g_test_rand_bit
gint32 | g_test_rand_int ()
gint32 | g_test_rand_int_range ()
double | g_test_rand_double ()
double | g_test_rand_double_range ()
#define | g_assert()
#define | g_assert_not_reached
#define | g_assert_cmpstr()
#define | g_assert_cmpint()
#define | g_assert_cmpuint()
#define | g_assert_cmphex()
#define | g_assert_cmpfloat()
#define | g_assert_no_error()
#define | g_assert_error()
#define | g_assert_true()
#define | g_assert_false()
#define | g_assert_null()
#define | g_assert_nonnull()
void | g_test_set_nonfatal_assertions ()
void | (*GTestFixtureFunc) ()
GTestCase * | g_test_create_case ()
GTestSuite * | g_test_create_suite ()
GTestSuite * | g_test_get_root ()
void | g_test_suite_add ()
void | g_test_suite_add_suite ()
int | g_test_run_suite ()

## Types and Values

enum | GTestFileType
enum | GTestTrapFlags
enum | GTestSubprocessFlags
typedef | GTestCase
typedef | GTestSuite

## Includes

    #include <glib.h>

## Description

GLib provides a framework for writing and maintaining unit tests in parallel to the code they are testing. The API is designed according to established concepts found in the other test frameworks (JUnit, NUnit, RUnit), which in turn is based on smalltalk unit testing concepts.

- Test case: Tests (test methods) are grouped together with their fixture into test cases.

- Fixture: A test fixture consists of fixture data and setup and teardown methods to establish the environment for the test functions. We use fresh fixtures, i.e. fixtures are newly set up and torn down around each test invocation to avoid dependencies between tests.

- Test suite: Test cases can be grouped into test suites, to allow subsets of the available tests to be run. Test suites can be grouped into other test suites as well.

The API is designed to handle creation and registration of test suites and test cases implicitly. A simple call like

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    g_test_add_func ("/misc/assertions", test_assertions);

creates a test suite called "misc" with a single test case named "assertions", which consists of running the test_assertions function.

In addition to the traditional `g_assert()`, the test framework provides an extended set of assertions for string and numerical comparisons: `g_assert_cmpfloat()`, `g_assert_cmpint()`, `g_assert_cmpuint()`, `g_assert_cmphex()`, `g_assert_cmpstr()`. The advantage of these variants over plain `g_assert()` is that the assertion messages can be more elaborate, and include the values of the compared entities.

GLib ships with two utilities called gtester and gtester-report to facilitate running tests and producing nicely formatted test reports.

A full example of creating a test suite with two tests using fixtures:

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    #include <glib.h>
    #include <locale.h>

    typedef struct {
      MyObject *obj;
      OtherObject *helper;
    } MyObjectFixture;

    static void
    my_object_fixture_set_up (MyObjectFixture *fixture,
                              gconstpointer user_data)
    {
      fixture->obj = my_object_new ();
      my_object_set_prop1 (fixture->obj, "some-value");
      my_object_do_some_complex_setup (fixture->obj, user_data);

      fixture->helper = other_object_new ();
    }

    static void
    my_object_fixture_tear_down (MyObjectFixture *fixture,
                                 gconstpointer user_data)
    {
      g_clear_object (&fixture->helper);
      g_clear_object (&fixture->obj);
    }

    static void
    test_my_object_test1 (MyObjectFixture *fixture,
                          gconstpointer user_data)
    {
      g_assert_cmpstr (my_object_get_property (fixture->obj), ==, "initial-value");
    }

    static void
    test_my_object_test2 (MyObjectFixture *fixture,
                          gconstpointer user_data)
    {
      my_object_do_some_work_using_helper (fixture->obj, fixture->helper);
      g_assert_cmpstr (my_object_get_property (fixture->obj), ==, "updated-value");
    }

    int
    main (int argc, char *argv[])
    {
      setlocale (LC_ALL, "");

      g_test_init (&argc, &argv, NULL);
      g_test_bug_base ("http://bugzilla.gnome.org/show_bug.cgi?id=");

      // Define the tests.
      g_test_add ("/my-object/test1", MyObjectFixture, "some-user-data",
                  my_object_fixture_set_up, test_my_object_test1,
                  my_object_fixture_tear_down);
      g_test_add ("/my-object/test2", MyObjectFixture, "some-user-data",
                  my_object_fixture_set_up, test_my_object_test2,
                  my_object_fixture_tear_down);

      return g_test_run ();
    }

## Functions

### g_test_minimized_result ()

    void
    g_test_minimized_result (double minimized_quantity,
                             const char *format,
                             ...);

Report the result of a performance or measurement test. The test should generally strive to minimize the reported quantities (smaller values are better than larger ones), this and `minimized_quantity` can determine sorting order for test result reports.

#### Parameters

minimized_quantity | the reported value |
format | the format string of the report message |
... | arguments to pass to the `printf()` function |

Since 2.16

### g_test_maximized_result ()

    void
    g_test_maximized_result (double maximized_quantity,
                             const char *format,
                             ...);

Report the result of a performance or measurement test. The test should generally strive to maximize the reported quantities (larger values are better than smaller ones), this and `maximized_quantity` can determine sorting order for test result reports.

#### Parameters

maximized_quantity | the reported value |
format | the format string of the report message |
... | arguments to pass to the `printf()` function |

Since 2.16

### g_test_init ()

    void
    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. 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.

  `slow`, `thorough`: Slow and thorough tests, may take quite long and maximize coverage.

  `quick`: Quick tests, should run really quickly and give good coverage.

  `undefined`: Tests for undefined behaviour, may provoke programming errors under `g_test_trap_subprocess()` or `g_test_expect_messages()` to check that appropriate assertions or warnings are given

  `no-undefined`: Avoid tests for undefined behaviour

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

#### Parameters

argc | Address of the `argc` parameter of the `main()` function. Changed if any arguments were handled. |
argv | Address of the `argv` parameter of `main()`. Any parameters understood by `g_test_init()` stripped before return. |
... | `NULL`-terminated list of special options. Currently the only defined option is `"no_g_set_prgname"`, which will cause `g_test_init()` to not call `g_set_prgname()`. |

Since 2.16

### g_test_initialized

    #define             g_test_initialized()

Returns `TRUE` if `g_test_init()` has been called.

#### Returns

`TRUE` if `g_test_init()` has been called.

Since 2.36

### g_test_quick

    #define             g_test_quick()

Returns `TRUE` if tests are run in quick mode. Exactly one of `g_test_quick()` and `g_test_slow()` is active in any run; there is no "medium speed".

#### Returns

`TRUE` if in quick mode

### g_test_slow

    #define             g_test_slow()

Returns `TRUE` if tests are run in slow mode. Exactly one of `g_test_quick()` and `g_test_slow()` is active in any run; there is no "medium speed".

#### Returns

the opposite of `g_test_quick()`

### g_test_thorough

    #define             g_test_thorough()

Returns `TRUE` if tests are run in thorough mode, equivalent to `g_test_slow()`.

#### Returns

the same thing as `g_test_slow()`

### g_test_perf

    #define             g_test_perf()

Returns `TRUE` if tests are run in performance mode.

#### Returns

`TRUE` if in performance mode

### g_test_verbose

    #define             g_test_verbose()

Returns `TRUE` if tests are run in verbose mode. The default is neither `g_test_verbose()` nor `g_test_quiet()`.

#### Returns

`TRUE` if in verbose mode

### g_test_undefined

    #define             g_test_undefined()

Returns `TRUE` if tests may provoke assertions and other formally-undefined behaviour, to verify that appropriate warnings are given. It might, in some cases, be useful to turn this off if running tests under valgrind.

#### Returns

`TRUE` if tests may provoke programming errors

### g_test_quiet

    #define             g_test_quiet()

Returns `TRUE` if tests are run in quiet mode. The default is neither `g_test_verbose()` nor `g_test_quiet()`.

#### Returns

`TRUE` if in quiet mode

### g_test_subprocess ()

    gboolean
    g_test_subprocess (void);

Returns `TRUE` (after `g_test_init()` has been called) if the test program is running under `g_test_trap_subprocess()`.

#### Returns

`TRUE` if the test program is running under `g_test_trap_subprocess()`.

Since 2.38

### g_test_run ()

    int
    g_test_run (void);

Runs all tests under the toplevel suite which can be retrieved with `g_test_get_root()`. Similar to `g_test_run_suite()`, the test cases to be run are filtered according to test path arguments (`-p testpath`) as parsed by `g_test_init()`. `g_test_run_suite()` or `g_test_run()` may only be called once in a program.

In general, the tests and sub-suites within each suite are run in the order in which they are defined. However, note that prior to GLib 2.36, there was a bug in the `g_test_add_*` functions which caused them to create multiple suites with the same name, meaning that if you created tests "/foo/simple", "/bar/simple", and "/foo/using-bar" in that order, they would get run in that order (since `g_test_run()` would run the first "/foo" suite, then the "/bar" suite, then the second "/foo" suite). As of 2.36, this bug is fixed, and adding the tests in that order would result in a running order of "/foo/simple", "/foo/using-bar", "/bar/simple". If this new ordering is sub-optimal (because it puts more-complicated tests before simpler ones, making it harder to figure out exactly what has failed), you can fix it by changing the test paths to group tests by suite in a way that will result in the desired running order. Eg, "/simple/foo", "/simple/bar", "/complex/foo-using-bar".

However, you should never make the actual result of a test depend on the order that tests are run in. If you need to ensure that some particular code runs before or after a given test case, use `g_test_add()`, which lets you specify setup and teardown functions.

If all tests are skipped, this function will return 0 if producing TAP output, or 77 (treated as "skip test" by Automake) otherwise.

#### Returns

0 on success, 1 on failure (assuming it returns at all), 0 or 77 if all tests were skipped with `g_test_skip()`

Since 2.16

### GTestFunc ()

    void
    (*GTestFunc) (void);

The type used for test case functions.

Since 2.28

### g_test_add_func ()

    void
    g_test_add_func (const char *testpath,
                     GTestFunc test_func);

Create a new test case, similar to `g_test_create_case()`. However the test is assumed to use no fixture, and test suites are automatically created on the fly and added to the root fixture, based on the slash-separated portions of `testpath` .

If `testpath` includes the component "subprocess" anywhere in it, the test will be skipped by default, and only run if explicitly required via the `-p` command-line option or `g_test_trap_subprocess()`.

#### Parameters

testpath | /-separated test case path name for the test. |
test_func | The test function to invoke for this test. | [scope async]

Since 2.16

### GTestDataFunc ()

    void
    (*GTestDataFunc) (gconstpointer user_data);

The type used for test case functions that take an extra pointer argument.

#### Parameters

user_data | the data provided when registering the test |

Since 2.28

### g_test_add_data_func ()

    void
    g_test_add_data_func (const char *testpath,
                          gconstpointer test_data,
                          GTestDataFunc test_func);

Create a new test case, similar to `g_test_create_case()`. However the test is assumed to use no fixture, and test suites are automatically created on the fly and added to the root fixture, based on the slash-separated portions of `testpath` . The `test_data` argument will be passed as first argument to `test_func` .

If `testpath` includes the component "subprocess" anywhere in it, the test will be skipped by default, and only run if explicitly required via the `-p` command-line option or `g_test_trap_subprocess()`.

#### Parameters

testpath | /-separated test case path name for the test. |
test_data | Test data argument for the test function. |
test_func | The test function to invoke for this test. | [scope async]

Since 2.16

### g_test_add_data_func_full ()

    void
    g_test_add_data_func_full (const char *testpath,
                               gpointer test_data,
                               GTestDataFunc test_func,
                               GDestroyNotify data_free_func);

Create a new test case, as with `g_test_add_data_func()`, but freeing `test_data` after the test run is complete.

#### Parameters

testpath | /-separated test case path name for the test. |
test_data | Test data argument for the test function. |
test_func | The test function to invoke for this test. |
data_free_func | GDestroyNotify for `test_data` . |

Since 2.34

### g_test_add()

    #define             g_test_add(testpath, Fixture, tdata, fsetup, ftest, fteardown)

Hook up a new test case at `testpath` , similar to `g_test_add_func()`. A fixture data structure with setup and teardown functions may be provided, similar to `g_test_create_case()`.

g_test_add() is implemented as a macro, so that the `fsetup()`, `ftest()` and `fteardown()` callbacks can expect a `Fixture` pointer as their first argument in a type safe manner. They otherwise have type GTestFixtureFunc.

#### Parameters

testpath | The test path for a new test case. |
Fixture | The type of a fixture data structure. |
tdata | Data argument for the test functions. |
fsetup | The function to set up the fixture data. |
ftest | The actual test function. |
fteardown | The function to tear down the fixture data. |

Since 2.16

### g_test_build_filename ()

    gchar *
    g_test_build_filename (GTestFileType file_type,
                           const gchar *first_path,
                           ...);

Creates the pathname to a data file that is required for a test.

This function is conceptually similar to `g_build_filename()` except that the first argument has been replaced with a GTestFileType argument.

The data file should either have been distributed with the module containing the test (`G_TEST_DIST`) or built as part of the build system of that module (`G_TEST_BUILT`).

In order for this function to work in srcdir != builddir situations, the G_TEST_SRCDIR and G_TEST_BUILDDIR environment variables need to have been defined. As of 2.38, this is done by the glib.mk included in GLib. Please ensure that your copy is up to date before using this function.

In case neither variable is set, this function will fall back to using the dirname portion of argv[0], possibly removing ".libs". This allows for casual running of tests directly from the commandline in the srcdir == builddir case and should also support running of installed tests, assuming the data files have been installed in the same relative path as the test binary.

#### Parameters

file_type | the type of file (built vs. distributed) |
first_path | the first segment of the pathname |
... | `NULL`-terminated additional path segments |

#### Returns

the path of the file, to be freed using `g_free()`

Since 2.38

### g_test_get_filename ()

    const gchar *
    g_test_get_filename (GTestFileType file_type,
                         const gchar *first_path,
                         ...);

Gets the pathname to a data file that is required for a test.

This is the same as `g_test_build_filename()` with two differences. The first difference is that must only use this function from within a testcase function. The second difference is that you need not free the return value -- it will be automatically freed when the testcase finishes running.

It is safe to use this function from a thread inside of a testcase but you must ensure that all such uses occur before the main testcase function returns (ie: it is best to ensure that all threads have been joined).

#### Parameters

file_type | the type of file (built vs. distributed) |
first_path | the first segment of the pathname |
... | `NULL`-terminated additional path segments |

#### Returns

the path, automatically freed at the end of the testcase

Since 2.38

### g_test_get_dir ()

    const gchar *
    g_test_get_dir (GTestFileType file_type);

Gets the pathname of the directory containing test files of the type specified by `file_type` .

This is approximately the same as calling g_test_build_filename("."), but you don't need to free the return value.

#### Parameters

file_type | the type of file (built vs. distributed) |

#### Returns

the path of the directory, owned by GLib

Since 2.38

### g_test_fail ()

    void
    g_test_fail (void);

Indicates that a test failed. This function can be called multiple times from the same test. You can use this function if your test failed in a recoverable way.

Do not use this function if the failure of a test could cause other tests to malfunction.

Calling this function will not stop the test from running, you need to return from the test function yourself. So you can produce additional diagnostic messages or even continue running the test.

If not called from inside a test, this function does nothing.

Since 2.30

### g_test_skip ()

    void
    g_test_skip (const gchar *msg);

Indicates that a test was skipped.

Calling this function will not stop the test from running, you need to return from the test function yourself. So you can produce additional diagnostic messages or even continue running the test.

If not called from inside a test, this function does nothing.

#### Parameters

msg | explanation. | [allow-none]

Since 2.38

### g_test_incomplete ()

    void
    g_test_incomplete (const gchar *msg);

Indicates that a test failed because of some incomplete functionality. This function can be called multiple times from the same test.

Calling this function will not stop the test from running, you need to return from the test function yourself. So you can produce additional diagnostic messages or even continue running the test.

If not called from inside a test, this function does nothing.

#### Parameters

msg | explanation. | [allow-none]

Since 2.38

### g_test_failed ()

    gboolean
    g_test_failed (void);

Returns whether a test has already failed. This will be the case when `g_test_fail()`, `g_test_incomplete()` or `g_test_skip()` have been called, but also if an assertion has failed.

This can be useful to return early from a test if continuing after a failed assertion might be harmful.

The return value of this function is only meaningful if it is called from inside a test function.

#### Returns

`TRUE` if the test has failed

Since 2.38

### g_test_message ()

    void
    g_test_message (const char *format,
                    ...);

Add a message to the test report.

#### Parameters

format | the format string |
... | printf-like arguments to `format` |

Since 2.16

### g_test_bug_base ()

    void
    g_test_bug_base (const char *uri_pattern);

Specify the base URI for bug reports.

The base URI is used to construct bug report messages for `g_test_message()` when `g_test_bug()` is called. Calling this function outside of a test case sets the default base URI for all test cases. Calling it from within a test case changes the base URI for the scope of the test case only. Bug URIs are constructed by appending a bug specific URI portion to `uri_pattern` , or by replacing the special string '%s' within `uri_pattern` if that is present.

#### Parameters

uri_pattern | the base pattern for bug URIs |

Since 2.16

### g_test_bug ()

    void
    g_test_bug (const char *bug_uri_snippet);

This function adds a message to test reports that associates a bug URI with a test case. Bug URIs are constructed from a base URI set with `g_test_bug_base()` and `bug_uri_snippet` .

#### Parameters

bug_uri_snippet | Bug specific bug tracker URI portion. |

Since 2.16

### GTestLogFatalFunc ()

    gboolean
    (*GTestLogFatalFunc) (const gchar *log_domain,
                          GLogLevelFlags log_level,
                          const gchar *message,
                          gpointer user_data);

Specifies the prototype of fatal log handler functions.

#### Parameters

log_domain | the log domain of the message |
log_level | the log level of the message (including the fatal and recursion flags) |
message | the message to process |
user_data | user data, set in `g_test_log_set_fatal_handler()` |

#### Returns

`TRUE` if the program should abort, `FALSE` otherwise

Since 2.22

### g_test_log_set_fatal_handler ()

    void
    g_test_log_set_fatal_handler (GTestLogFatalFunc log_func,
                                  gpointer user_data);

Installs a non-error fatal log handler which can be used to decide whether log messages which are counted as fatal abort the program.

The use case here is that you are running a test case that depends on particular libraries or circumstances and cannot prevent certain known critical or warning messages. So you install a handler that compares the domain and message to precisely not abort in such a case.

Note that the handler is reset at the beginning of any test case, so you have to set it inside each test function which needs the special behavior.

This handler has no effect on g_error messages.

#### Parameters

log_func | the log handler function. |
user_data | data passed to the log handler. |

Since 2.22

### g_test_timer_start ()

    void
    g_test_timer_start (void);

Start a timing test. Call `g_test_timer_elapsed()` when the task is supposed to be done. Call this function again to restart the timer.

Since 2.16

### g_test_timer_elapsed ()

    double
    g_test_timer_elapsed (void);

Get the time since the last start of the timer with `g_test_timer_start()`.

#### Returns

the time since the last start of the timer, as a double

Since 2.16

### g_test_timer_last ()

    double
    g_test_timer_last (void);

Report the last result of `g_test_timer_elapsed()`.

#### Returns

the last result of `g_test_timer_elapsed()`, as a double

Since 2.16

### g_test_queue_free ()

    void
    g_test_queue_free (gpointer gfree_pointer);

Enqueue a pointer to be released with `g_free()` during the next teardown phase. This is equivalent to calling `g_test_queue_destroy()` with a destroy callback of `g_free()`.

#### Parameters

gfree_pointer | the pointer to be stored. |

Since 2.16

### g_test_queue_destroy ()

    void
    g_test_queue_destroy (GDestroyNotify destroy_func,
                          gpointer destroy_data);

This function enqueus a callback `destroy_func` to be executed during the next test case teardown phase. This is most useful to auto destruct allocted test resources at the end of a test run. Resources are released in reverse queue order, that means enqueueing callback A before callback B will cause `B()` to be called before `A()` during teardown.

#### Parameters

destroy_func | Destroy callback for teardown phase. |
destroy_data | Destroy callback data. |

Since 2.16

### g_test_queue_unref()

    #define             g_test_queue_unref(gobject)

Enqueue an object to be released with `g_object_unref()` during the next teardown phase. This is equivalent to calling `g_test_queue_destroy()` with a destroy callback of `g_object_unref()`.

#### Parameters

gobject | the object to unref |

Since 2.16

### g_test_expect_message ()

    void
    g_test_expect_message (const gchar *log_domain,
                           GLogLevelFlags log_level,
                           const gchar *pattern);

Indicates that a message with the given `log_domain` and `log_level` , with text matching `pattern` , is expected to be logged. When this message is logged, it will not be printed, and the test case will not abort.

Use `g_test_assert_expected_messages()` to assert that all previously-expected messages have been seen and suppressed.

You can call this multiple times in a row, if multiple messages are expected as a result of a single call. (The messages must appear in the same order as the calls to `g_test_expect_message()`.)

For example:

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    // g_main_context_push_thread_default() should fail if the
    // context is already owned by another thread.
    g_test_expect_message (G_LOG_DOMAIN,
                           G_LOG_LEVEL_CRITICAL,
                           "assertion*acquired_context*failed");
    g_main_context_push_thread_default (bad_context);
    g_test_assert_expected_messages ();

Note that you cannot use this to test `g_error()` messages, since `g_error()` intentionally never returns even if the program doesn't abort; use `g_test_trap_subprocess()` in this case.

If messages at `G_LOG_LEVEL_DEBUG` are emitted, but not explicitly expected via `g_test_expect_message()` then they will be ignored.

#### Parameters

log_domain | the log domain of the message. | [allow-none]
log_level | the log level of the message |
pattern | a glob-style pattern |

Since 2.34

### g_test_assert_expected_messages

    #define             g_test_assert_expected_messages()

Asserts that all messages previously indicated via `g_test_expect_message()` have been seen and suppressed.

If messages at `G_LOG_LEVEL_DEBUG` are emitted, but not explicitly expected via `g_test_expect_message()` then they will be ignored.

Since 2.34

### g_test_trap_subprocess ()

    void
    g_test_trap_subprocess (const char *test_path,
                            guint64 usec_timeout,
                            GTestSubprocessFlags test_flags);

Respawns the test program to run only `test_path` in a subprocess. This can be used for a test case that might not return, or that might abort.

If `test_path` is `NULL` then the same test is re-run in a subprocess. You can use `g_test_subprocess()` to determine whether the test is in a subprocess or not.

`test_path` can also be the name of the parent test, followed by "`/subprocess/`" and then a name for the specific subtest (or just ending with "`/subprocess`" if the test only has one child test); tests with names of this form will automatically be skipped in the parent process.

If `usec_timeout` is non-0, the test subprocess is aborted and considered failing if its run time exceeds it.

The subprocess behavior can be configured with the GTestSubprocessFlags flags.

You can use methods such as `g_test_trap_assert_passed()`, `g_test_trap_assert_failed()`, and `g_test_trap_assert_stderr()` to check the results of the subprocess. (But note that `g_test_trap_assert_stdout()` and `g_test_trap_assert_stderr()` cannot be used if `test_flags` specifies that the child should inherit the parent stdout/stderr.)

If your ``main()`` needs to behave differently in the subprocess, you can call `g_test_subprocess()` (after calling `g_test_init()`) to see whether you are in a subprocess.

The following example tests that calling `my_object_new(1000000)` will abort with an error message.

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    static void
    test_create_large_object_subprocess (void)
    {
      if (g_test_subprocess ())
        {
          my_object_new (1000000);
          return;
        }

      // Reruns this same test in a subprocess
      g_test_trap_subprocess (NULL, 0, 0);
      g_test_trap_assert_failed ();
      g_test_trap_assert_stderr ("*ERROR*too large*");
    }

    int
    main (int argc, char **argv)
    {
      g_test_init (&argc, &argv, NULL);

      g_test_add_func ("/myobject/create_large_object",
                       test_create_large_object);
      return g_test_run ();
    }

#### Parameters

test_path | Test to run in a subprocess. | [allow-none]
usec_timeout | Timeout for the subprocess test in micro seconds. |
test_flags | Flags to modify subprocess behaviour. |

Since 2.38

### g_test_trap_has_passed ()

    gboolean
    g_test_trap_has_passed (void);

Check the result of the last `g_test_trap_subprocess()` call.

#### Returns

`TRUE` if the last test subprocess terminated successfully.

Since 2.16

### g_test_trap_reached_timeout ()

    gboolean
    g_test_trap_reached_timeout (void);

Check the result of the last `g_test_trap_subprocess()` call.

#### Returns

`TRUE` if the last test subprocess got killed due to a timeout.

Since 2.16

### g_test_trap_assert_passed

    #define             g_test_trap_assert_passed()

Assert that the last test subprocess passed. See `g_test_trap_subprocess()`.

Since 2.16

### g_test_trap_assert_failed

    #define             g_test_trap_assert_failed()

Assert that the last test subprocess failed. See `g_test_trap_subprocess()`.

This is sometimes used to test situations that are formally considered to be undefined behaviour, like inputs that fail a `g_return_if_fail()` check. In these situations you should skip the entire test, including the call to `g_test_trap_subprocess()`, unless `g_test_undefined()` returns `TRUE` to indicate that undefined behaviour may be tested.

Since 2.16

### g_test_trap_assert_stdout()

    #define             g_test_trap_assert_stdout(soutpattern)

Assert that the stdout output of the last test subprocess matches `soutpattern` . See `g_test_trap_subprocess()`.

#### Parameters

soutpattern | a glob-style pattern |

Since 2.16

### g_test_trap_assert_stdout_unmatched()

    #define             g_test_trap_assert_stdout_unmatched(soutpattern)

Assert that the stdout output of the last test subprocess does not match `soutpattern` . See `g_test_trap_subprocess()`.

#### Parameters

soutpattern | a glob-style pattern |

Since 2.16

### g_test_trap_assert_stderr()

    #define             g_test_trap_assert_stderr(serrpattern)

Assert that the stderr output of the last test subprocess matches `serrpattern` . See `g_test_trap_subprocess()`.

This is sometimes used to test situations that are formally considered to be undefined behaviour, like code that hits a `g_assert()` or `g_error()`. In these situations you should skip the entire test, including the call to `g_test_trap_subprocess()`, unless `g_test_undefined()` returns `TRUE` to indicate that undefined behaviour may be tested.

#### Parameters

serrpattern | a glob-style pattern |

Since 2.16

### g_test_trap_assert_stderr_unmatched()

    #define             g_test_trap_assert_stderr_unmatched(serrpattern)

Assert that the stderr output of the last test subprocess does not match `serrpattern` . See `g_test_trap_subprocess()`.

#### Parameters

serrpattern | a glob-style pattern |

Since 2.16

### g_test_trap_fork ()

    gboolean
    g_test_trap_fork (guint64 usec_timeout,
                      GTestTrapFlags test_trap_flags);

`g_test_trap_fork` is deprecated and should not be used in newly-written code.

This function is implemented only on Unix platforms, and is not always reliable due to problems inherent in fork-without-exec. Use `g_test_trap_subprocess()` instead.

Fork the current test program to execute a test case that might not return or that might abort.

If `usec_timeout` is non-0, the forked test case is aborted and considered failing if its run time exceeds it.

The forking behavior can be configured with the GTestTrapFlags flags.

In the following example, the test code forks, the forked child process produces some sample output and exits successfully. The forking parent process then asserts successful child program termination and validates child program outputs.

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    static void
    test_fork_patterns (void)
    {
      if (g_test_trap_fork (0, G_TEST_TRAP_SILENCE_STDOUT | G_TEST_TRAP_SILENCE_STDERR))
        {
          g_print ("some stdout text: somagic17\n");
          g_printerr ("some stderr text: semagic43\n");
          exit (0); // successful test run
        }
      g_test_trap_assert_passed ();
      g_test_trap_assert_stdout ("*somagic17*");
      g_test_trap_assert_stderr ("*semagic43*");
    }

#### Parameters

usec_timeout | Timeout for the forked test in micro seconds. |
test_trap_flags | Flags to modify forking behaviour. |

#### Returns

`TRUE` for the forked child and `FALSE` for the executing parent process.

Since 2.16

### g_test_rand_bit

    #define             g_test_rand_bit()

Get a reproducible random bit (0 or 1), see `g_test_rand_int()` for details on test case random numbers.

Since 2.16

### g_test_rand_int ()

    gint32
    g_test_rand_int (void);

Get a reproducible random integer number.

The random numbers generated by the g_test_rand_*() family of functions change with every new test program start, unless the --seed option is given when starting test programs.

For individual test cases however, the random number generator is reseeded, to avoid dependencies between tests and to make --seed effective for all test cases.

#### Returns

a random number from the seeded random number generator.

Since 2.16

### g_test_rand_int_range ()

    gint32
    g_test_rand_int_range (gint32 begin,
                           gint32 end);

Get a reproducible random integer number out of a specified range, see `g_test_rand_int()` for details on test case random numbers.

#### Parameters

begin | the minimum value returned by this function |
end | the smallest value not to be returned by this function |

#### Returns

a number with `begin` <= number < `end` .

Since 2.16

### g_test_rand_double ()

    double
    g_test_rand_double (void);

Get a reproducible random floating point number, see `g_test_rand_int()` for details on test case random numbers.

#### Returns

a random number from the seeded random number generator.

Since 2.16

### g_test_rand_double_range ()

    double
    g_test_rand_double_range (double range_start,
                              double range_end);

Get a reproducible random floating pointer number out of a specified range, see `g_test_rand_int()` for details on test case random numbers.

#### Parameters

range_start | the minimum value returned by this function |
range_end | the minimum value not returned by this function |

#### Returns

a number with `range_start` <= number < `range_end` .

Since 2.16

### g_assert()

    #define             g_assert(expr)

Debugging macro to terminate the application if the assertion fails. If the assertion fails (i.e. the expression is not true), an error message is logged and the application is terminated.

The macro can be turned off in final releases of code by defining `G_DISABLE_ASSERT` when compiling the application.

#### Parameters

expr | the expression to check |

### g_assert_not_reached

    #define             g_assert_not_reached()

Debugging macro to terminate the application if it is ever reached. If it is reached, an error message is logged and the application is terminated.

The macro can be turned off in final releases of code by defining `G_DISABLE_ASSERT` when compiling the application.

### g_assert_cmpstr()

    #define             g_assert_cmpstr(s1, cmp, s2)

Debugging macro to compare two strings. If the comparison fails, an error message is logged and the application is either terminated or the testcase marked as failed. The strings are compared using `g_strcmp0()`.

The effect of `g_assert_cmpstr (s1, op, s2)` is the same as `g_assert_true (g_strcmp0 (s1, s2) op 0)`. The advantage of this macro is that it can produce a message that includes the actual values of `s1` and `s2` .

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    g_assert_cmpstr (mystring, ==, "fubar");

#### Parameters

s1 | a string (may be `NULL`) |
cmp | The comparison operator to use. One of ==, !=, <, >, <=, >=. |
s2 | another string (may be `NULL`) |

Since 2.16

### g_assert_cmpint()

    #define             g_assert_cmpint(n1, cmp, n2)

Debugging macro to compare two integers.

The effect of `g_assert_cmpint (n1, op, n2)` is the same as `g_assert_true (n1 op n2)`. The advantage of this macro is that it can produce a message that includes the actual values of `n1` and `n2` .

#### Parameters

n1 | an integer |
cmp | The comparison operator to use. One of ==, !=, <, >, <=, >=. |
n2 | another integer |

Since 2.16

### g_assert_cmpuint()

    #define             g_assert_cmpuint(n1, cmp, n2)

Debugging macro to compare two unsigned integers.

The effect of `g_assert_cmpuint (n1, op, n2)` is the same as `g_assert_true (n1 op n2)`. The advantage of this macro is that it can produce a message that includes the actual values of `n1` and `n2` .

#### Parameters

n1 | an unsigned integer |
cmp | The comparison operator to use. One of ==, !=, <, >, <=, >=. |
n2 | another unsigned integer |

Since 2.16

### g_assert_cmphex()

    #define             g_assert_cmphex(n1, cmp, n2)

Debugging macro to compare to unsigned integers.

This is a variant of `g_assert_cmpuint()` that displays the numbers in hexadecimal notation in the message.

#### Parameters

n1 | an unsigned integer |
cmp | The comparison operator to use. One of ==, !=, <, >, <=, >=. |
n2 | another unsigned integer |

Since 2.16

### g_assert_cmpfloat()

    #define             g_assert_cmpfloat(n1,cmp,n2)

Debugging macro to compare two floating point numbers.

The effect of `g_assert_cmpfloat (n1, op, n2)` is the same as `g_assert_true (n1 op n2)`. The advantage of this macro is that it can produce a message that includes the actual values of `n1` and `n2` .

#### Parameters

n1 | an floating point number |
cmp | The comparison operator to use. One of ==, !=, <, >, <=, >=. |
n2 | another floating point number |

Since 2.16

### g_assert_no_error()

    #define             g_assert_no_error(err)

Debugging macro to check that a GError is not set.

The effect of `g_assert_no_error (err)` is the same as `g_assert_true (err == NULL)`. The advantage of this macro is that it can produce a message that includes the error message and code.

#### Parameters

err | a GError, possibly `NULL` |

Since 2.20

### g_assert_error()

    #define             g_assert_error(err, dom, c)

Debugging macro to check that a method has returned the correct GError.

The effect of `g_assert_error (err, dom, c)` is the same as `g_assert_true (err != NULL && err->domain == dom && err->code == c)`. The advantage of this macro is that it can produce a message that includes the incorrect error message and code.

This can only be used to test for a specific error. If you want to test that `err` is set, but don't care what it's set to, just use `g_assert (err != NULL)`

#### Parameters

err | a GError, possibly `NULL` |
dom | the expected error domain (a GQuark) |
c | the expected error code |

Since 2.20

### g_assert_true()

    #define             g_assert_true(expr)

Debugging macro to check that an expression is true.

If the assertion fails (i.e. the expression is not true), an error message is logged and the application is either terminated or the testcase marked as failed.

See `g_test_set_nonfatal_assertions()`.

#### Parameters

expr | the expression to check |

Since 2.38

### g_assert_false()

    #define             g_assert_false(expr)

Debugging macro to check an expression is false.

If the assertion fails (i.e. the expression is not false), an error message is logged and the application is either terminated or the testcase marked as failed.

See `g_test_set_nonfatal_assertions()`.

#### Parameters

expr | the expression to check |

Since 2.38

### g_assert_null()

    #define             g_assert_null(expr)

Debugging macro to check an expression is `NULL`.

If the assertion fails (i.e. the expression is not `NULL`), an error message is logged and the application is either terminated or the testcase marked as failed.

See `g_test_set_nonfatal_assertions()`.

#### Parameters

expr | the expression to check |

Since 2.38

### g_assert_nonnull()

    #define             g_assert_nonnull(expr)

Debugging macro to check an expression is not `NULL`.

If the assertion fails (i.e. the expression is `NULL`), an error message is logged and the application is either terminated or the testcase marked as failed.

See `g_test_set_nonfatal_assertions()`.

#### Parameters

expr | the expression to check |

Since 2.40

### g_test_set_nonfatal_assertions ()

    void
    g_test_set_nonfatal_assertions (void);

Changes the behaviour of `g_assert_cmpstr()`, `g_assert_cmpint()`, `g_assert_cmpuint()`, `g_assert_cmphex()`, `g_assert_cmpfloat()`, `g_assert_true()`, `g_assert_false()`, `g_assert_null()`, `g_assert_no_error()`, `g_assert_error()`, `g_test_assert_expected_messages()` and the various g_test_trap_assert_*() macros to not abort to program, but instead call `g_test_fail()` and continue. (This also changes the behavior of `g_test_fail()` so that it will not cause the test program to abort after completing the failed test.)

Note that the `g_assert_not_reached()` and `g_assert()` are not affected by this.

This function can only be called after `g_test_init()`.

Since 2.38

### GTestFixtureFunc ()

    void
    (*GTestFixtureFunc) (gpointer fixture,
                         gconstpointer user_data);

The type used for functions that operate on test fixtures. This is used for the fixture setup and teardown functions as well as for the testcases themselves.

`user_data` is a pointer to the data that was given when registering the test case.

`fixture` will be a pointer to the area of memory allocated by the test framework, of the size requested. If the requested size was zero then `fixture` will be equal to `user_data` .

#### Parameters

fixture | the test fixture |
user_data | the data provided when registering the test |

Since 2.28

### g_test_create_case ()

    GTestCase *
    g_test_create_case (const char *test_name,
                        gsize data_size,
                        gconstpointer test_data,
                        GTestFixtureFunc data_setup,
                        GTestFixtureFunc data_test,
                        GTestFixtureFunc data_teardown);

Create a new GTestCase, named `test_name` , this API is fairly low level, calling `g_test_add()` or `g_test_add_func()` is preferable. When this test is executed, a fixture structure of size `data_size` will be automatically allocated and filled with zeros. Then `data_setup` is called to initialize the fixture. After fixture setup, the actual test function `data_test` is called. Once the test run completes, the fixture structure is torn down by calling `data_teardown` and after that the memory is automatically released by the test framework.

Splitting up a test run into fixture setup, test function and fixture teardown is most useful if the same fixture is used for multiple tests. In this cases, `g_test_create_case()` will be called with the same fixture, but varying `test_name` and `data_test` arguments.

#### Parameters

test_name | the name for the test case |
data_size | the size of the fixture data structure |
test_data | test data argument for the test functions |
data_setup | the function to set up the fixture data. | [scope async]
data_test | the actual test function. | [scope async]
data_teardown | the function to teardown the fixture data. | [scope async]

#### Returns

a newly allocated GTestCase.

Since 2.16

### g_test_create_suite ()

    GTestSuite *
    g_test_create_suite (const char *suite_name);

Create a new test suite with the name `suite_name` .

#### Parameters

suite_name | a name for the suite |

#### Returns

A newly allocated GTestSuite instance.

Since 2.16

### g_test_get_root ()

    GTestSuite *
    g_test_get_root (void);

Get the toplevel test suite for the test path API.

#### Returns

the toplevel GTestSuite

Since 2.16

### g_test_suite_add ()

    void
    g_test_suite_add (GTestSuite *suite,
                      GTestCase *test_case);

Adds `test_case` to `suite` .

#### Parameters

suite | a GTestSuite |
test_case | a GTestCase |

Since 2.16

### g_test_suite_add_suite ()

    void
    g_test_suite_add_suite (GTestSuite *suite,
                            GTestSuite *nestedsuite);

Adds `nestedsuite` to `suite` .

#### Parameters

suite | a GTestSuite |
nestedsuite | another GTestSuite |

Since 2.16

### g_test_run_suite ()

    int
    g_test_run_suite (GTestSuite *suite);

Execute the tests within `suite` and all nested GTestSuites. The test suites to be executed are filtered according to test path arguments (`-p testpath`) as parsed by `g_test_init()`. See the `g_test_run()` documentation for more information on the order that tests are run in.

g_test_run_suite() or `g_test_run()` may only be called once in a program.

#### Parameters

suite | a GTestSuite |

#### Returns

0 on success

Since 2.16

## Types and Values

### enum GTestFileType

The type of file to return the filename for, when used with `g_test_build_filename()`.

These two options correspond rather directly to the 'dist' and 'built' terminology that automake uses and are explicitly used to distinguish between the 'srcdir' and 'builddir' being separate. All files in your project should either be dist (in the `DIST_EXTRA` or `dist_schema_DATA` sense, in which case they will always be in the srcdir) or built (in the `BUILT_SOURCES` sense, in which case they will always be in the builddir).

Note: as a general rule of automake, files that are generated only as part of the build-from-git process (but then are distributed with the tarball) always go in srcdir (even if doing a srcdir != builddir build from git) and are considered as distributed files.

#### Members

G_TEST_DIST | a file that was included in the distribution tarball |
G_TEST_BUILT | a file that was built on the compiling machine |

Since 2.38

### enum GTestTrapFlags

`GTestTrapFlags` is deprecated and should not be used in newly-written code.

GTestTrapFlags is used only with `g_test_trap_fork()`, which is deprecated. `g_test_trap_subprocess()` uses GTestTrapSubprocessFlags.

Test traps are guards around forked tests. These flags determine what traps to set.

#### Members

G_TEST_TRAP_SILENCE_STDOUT | Redirect stdout of the test child to `/dev/null` so it cannot be observed on the console during test runs. The actual output is still captured though to allow later tests with `g_test_trap_assert_stdout()`. |
G_TEST_TRAP_SILENCE_STDERR | Redirect stderr of the test child to `/dev/null` so it cannot be observed on the console during test runs. The actual output is still captured though to allow later tests with `g_test_trap_assert_stderr()`. |
G_TEST_TRAP_INHERIT_STDIN | If this flag is given, stdin of the child process is shared with stdin of its parent process. It is redirected to `/dev/null` otherwise. |

### enum GTestSubprocessFlags

Flags to pass to `g_test_trap_subprocess()` to control input and output.

Note that in contrast with `g_test_trap_fork()`, the default is to not show stdout and stderr.

#### Members

G_TEST_SUBPROCESS_INHERIT_STDIN | If this flag is given, the child process will inherit the parent's stdin. Otherwise, the child's stdin is redirected to `/dev/null`. |
G_TEST_SUBPROCESS_INHERIT_STDOUT | If this flag is given, the child process will inherit the parent's stdout. Otherwise, the child's stdout will not be visible, but it will be captured to allow later tests with `g_test_trap_assert_stdout()`. |
G_TEST_SUBPROCESS_INHERIT_STDERR | If this flag is given, the child process will inherit the parent's stderr. Otherwise, the child's stderr will not be visible, but it will be captured to allow later tests with `g_test_trap_assert_stderr()`. |

### GTestCase

    typedef struct GTestCase  GTestCase;

An opaque structure representing a test case.

### GTestSuite

    typedef struct GTestSuite GTestSuite;

An opaque structure representing a test suite.

## See Also

gtester, gtester-report