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

Tests Under the Hood
====================

Running sandbox tests directly
------------------------------

Typically tests are run using the pytest suite. Running pytests on sandbox is
easy and always gets things right. For example some tests require files to be
set up before they can work.

But it is also possible to run some sandbox tests directly. For example, this
runs the dm_test_gpio() test which you can find in test/dm/gpio.c::

   $ ./u-boot -T -c "ut dm gpio"


   U-Boot 2021.01

   Model: sandbox
   DRAM:  128 MiB
   WDT:   Started with servicing (60s timeout)
   MMC:   mmc2: 2 (SD), mmc1: 1 (SD), mmc0: 0 (SD)
   In:    serial
   Out:   vidconsole
   Err:   vidconsole
   Model: sandbox
   SCSI:
   Net:   eth0: eth@10002000, eth5: eth@10003000, eth3: sbe5, eth6: eth@10004000
   Test: dm_test_gpio: gpio.c
   Test: dm_test_gpio: gpio.c (flat tree)
   Failures: 0

The -T option tells the U-Boot sandbox to run with the 'test' devicetree
(test.dts) instead of -D which selects the normal sandbox.dts - this is
necessary because many tests rely on nodes or properties in the test devicetree.
If you try running tests without -T then you may see failures, like::

   $ ./u-boot -c "ut dm gpio"


   U-Boot 2021.01

   DRAM:  128 MiB
   WDT:   Not found!
   MMC:
   In:    serial
   Out:   serial
   Err:   serial
   SCSI:
   Net:   No ethernet found.
   Please run with test device tree:
       ./u-boot -d arch/sandbox/dts/test.dtb
   Test: dm_test_gpio: gpio.c
   test/dm/gpio.c:37, dm_test_gpio(): 0 == gpio_lookup_name("b4", &dev, &offset, &gpio): Expected 0x0 (0), got 0xffffffea (-22)
   Test: dm_test_gpio: gpio.c (flat tree)
   test/dm/gpio.c:37, dm_test_gpio(): 0 == gpio_lookup_name("b4", &dev, &offset, &gpio): Expected 0x0 (0), got 0xffffffea (-22)
   Failures: 2

The message above should provide a hint if you forget to use the -T flag. Even
running with -D will produce different results.

You can easily use gdb on these tests, without needing --gdbserver::

   $ gdb u-boot --args -T -c "ut dm gpio"
   ...
   (gdb) break dm_test_gpio
   Breakpoint 1 at 0x1415bd: file test/dm/gpio.c, line 37.
   (gdb) run -T -c "ut dm gpio"
   Starting program: u-boot -T -c "ut dm gpio"
   Test: dm_test_gpio: gpio.c

   Breakpoint 1, dm_test_gpio (uts=0x5555558029a0 <global_dm_test_state>)
       at files/test/dm/gpio.c:37
   37		ut_assertok(gpio_lookup_name("b4", &dev, &offset, &gpio));
   (gdb)

You can then single-step and look at variables as needed.


Running sandbox_spl tests directly
----------------------------------

SPL is the phase before U-Boot proper. It is present in the sandbox_spl build,
so you can run SPL like this::

   ./spl/u-boot-spl

SPL tests are special in that they run (only in the SPL phase, of course) if the
-u flag is given::

   ./spl/u-boot-spl -u

   U-Boot SPL 2021.01-00723-g43c77b51be5-dirty (Jan 24 2021 - 16:38:24 -0700)
   Running 5 driver model tests
   Test: dm_test_of_plat_base: of_platdata.c (flat tree)
   Test: dm_test_of_plat_dev: of_platdata.c (flat tree)
   Test: dm_test_of_plat_parent: of_platdata.c (flat tree)
   Test: dm_test_of_plat_phandle: of_platdata.c (flat tree)
   Test: dm_test_of_plat_props: of_platdata.c (flat tree)
   Failures: 0


   U-Boot 2021.01-00723-g43c77b51be5-dirty (Jan 24 2021 - 16:38:24 -0700)

   DRAM:  128 MiB
   ...

It is not possible to run SPL tests in U-Boot proper, firstly because they are
not built into U-Boot proper and secondly because the environment is very
different, e.g. some SPL tests rely on of-platdata which is only available in
SPL.

Note that after running, SPL continues to boot into U-Boot proper. You can add
'-c exit' to make U-Boot quit without doing anything further. It is not
currently possible to run SPL tests and then stop, since the pytests require
that U-Boot produces the expected banner.

You can use the -k flag to select which tests run::

   ./spl/u-boot-spl -u -k dm_test_of_plat_parent

Of course you can use gdb with sandbox_spl, just as with sandbox.


Running all tests directly
--------------------------

A fast way to run all sandbox tests is::

   ./u-boot -T -c "ut all"

It typically runs single-thread in 6 seconds on 2021 hardware, with 2s of that
to the delays in the time test.

This should not be considered a substitute for 'make check', but can be helpful
for git bisect, etc.


What tests are built in?
------------------------

Whatever sandbox build is used, which tests are present is determined by which
source files are built. For sandbox_spl, the of_platdata tests are built
because of the build rule in test/dm/Makefile::

   ifeq ($(CONFIG_SPL_BUILD),y)
   obj-$(CONFIG_SPL_OF_PLATDATA) += of_platdata.o
   else
   ...other tests for non-spl
   endif

You can get a list of tests in a U-Boot ELF file by looking for the
linker_list::

   $ nm /tmp/b/sandbox_spl/spl/u-boot-spl |grep 2_dm_test
   000000000001f200 D _u_boot_list_2_dm_test_2_dm_test_of_plat_base
   000000000001f220 D _u_boot_list_2_dm_test_2_dm_test_of_plat_dev
   000000000001f240 D _u_boot_list_2_dm_test_2_dm_test_of_plat_parent
   000000000001f260 D _u_boot_list_2_dm_test_2_dm_test_of_plat_phandle
   000000000001f280 D _u_boot_list_2_dm_test_2_dm_test_of_plat_props