.. SPDX-License-Identifier: GPL-2.0+:

.. index::
   single: ut (command)

ut command
==========

Synopsis
--------

::

    ut [-r<runs>] [-f] [-I<n>:<one_test>] [<suite> [<test>]]

       <runs>      Number of times to run each test
       -f          Force 'manual' tests to run as well
       <n>         Run <one test> after <n> other tests have run
       <one_test>  Name of the 'one' test to run
       <suite>     Test suite to run, or `all`
       <test>      Name of single test to run

Description
-----------

The ut command runs unit tests written in C.

Typically the command is run on :ref:`arch/sandbox/sandbox:sandbox` since it
includes a near-complete set of emulators, no code-size limits, many CONFIG
options enabled and runs easily in CI without needing QEMU. It is also possible
to run some tests on real boards.

For a list of available test suites, type `ut` by itself.

Each test is normally run once, although those marked with `UT_TESTF_DM` are
run with livetree and flattree where possible. To run a test more than once,
use the `-r` flag.

Manual tests are normally skipped by this command. Use `-f` to run them. See
See :ref:`develop/tests_writing:mixing python and c` for more information on
manual test.

When running unit tests, some may have side effects which cause a subsequent
test to break. This can sometimes be seen when using 'ut dm' or similar. To
fix this, select the 'one' test which breaks. Then tell the 'ut' command to
run this one test after a certain number of other tests have run. Using a
binary search method with `-I` you can quickly figure one which test is causing
the problem.

Generally all tests in the suite are run. To run just a single test from the
suite, provide the <test> argument.

See :ref:`develop/tests_writing:writing c tests` for more information on how to
write unit tests.

Example
-------

List available unit-test suites::

    => ut
    ut - unit tests

    Usage:
    ut [-r] [-f] [<suite>] - run unit tests
    -r<runs>   Number of times to run each test
    -f         Force 'manual' tests to run as well
    <suite>    Test suite to run, or all

    Suites:
    all - execute all enabled tests
    addrmap - very basic test of addrmap command
    bloblist - bloblist implementation
    bootstd - standard boot implementation
    compression - compressors and bootm decompression
    dm - driver model
    env - environment
    fdt - fdt command
    loadm - loadm command parameters and loading memory blob
    lib - library functions
    log - logging functions
    mem - memory-related commands
    overlay - device tree overlays
    print  - printing things to the console
    setexpr - setexpr command
    str - basic test of string functions
    time - very basic test of time functions
    unicode - Unicode functions

Run one of the suites::

    => ut bloblist
    Running 14 bloblist tests
    Test: bloblist_test_align: bloblist.c
    Test: bloblist_test_bad_blob: bloblist.c
    Test: bloblist_test_blob: bloblist.c
    Test: bloblist_test_blob_ensure: bloblist.c
    Test: bloblist_test_blob_maxsize: bloblist.c
    Test: bloblist_test_checksum: bloblist.c
    Test: bloblist_test_cmd_info: bloblist.c
    Test: bloblist_test_cmd_list: bloblist.c
    Test: bloblist_test_grow: bloblist.c
    Test: bloblist_test_init: bloblist.c
    Test: bloblist_test_reloc: bloblist.c
    Test: bloblist_test_resize_fail: bloblist.c
    Test: bloblist_test_resize_last: bloblist.c
    Test: bloblist_test_shrink: bloblist.c
    Failures: 0

Run just a single test in a suite::

    => ut bloblist bloblist_test_grow
    Test: bloblist_test_grow: bloblist.c
    Failures: 0

Show information about tests::

    => ut info
    Test suites: 21
    Total tests: 642