unittests
*********

run_tests.sh is driven by the <arch>/unittests.cfg file. That file defines
test cases by specifying an executable (target image) under the <arch>/
directory, and how to run it. This way, for example, a single file can
provide multiple test cases by being run with different host configurations
and/or different parameters passed to it.

Detailed output from run_tests.sh unit tests are stored in files under
the logs/ directory.

unittests.cfg format
====================

# is the comment symbol, all following contents of the line is ignored.

Each unit test is defined with a [unit-test-name] line, followed by
a set of parameters that control how the test case is run. The name is
arbitrary and appears in the status reporting output.

Parameters appear on their own lines under the test name, and have a
param = value format.

Available parameters
====================
Note! Some parameters like smp and extra_params modify how a test is run,
while others like arch and accel restrict the configurations in which the
test is run.

file
----
file = <filename>

This parameter is mandatory and specifies which binary under the <arch>/
directory to run. Typically this is <name>.flat or <name>.elf, depending
on the arch. The directory name is not included, only the file name.

arch
----
For <arch>/ directories that support multiple architectures, this restricts
the test to the specified arch. By default, the test will run on any
architecture.

smp
---
smp = <number>

Optional, the number of processors created in the machine to run the test.
Defaults to 1. $MAX_SMP can be used to specify the maximum supported.

extra_params
------------
These are extra parameters supplied to the QEMU process. -append '...' can
be used to pass arguments into the test case argv. Multiple parameters can
be added, for example:

extra_params = -m 256 -append 'smp=2'

groups
------
groups = <group_name1> <group_name2> ...

Used to group the test cases for the `run_tests.sh -g ...` run group
option. Adding a test to the nodefault group will cause it to not be
run by default.

accel
-----
accel = kvm|tcg

This restricts the test to the specified accelerator. By default, the
test will run on either accelerator. (Note, the accelerator can be
specified with ACCEL= environment variable, and defaults to KVM if
available).

timeout
-------
timeout = <duration>

Optional timeout in seconds, after which the test will be killed and fail.

check
-----
check = <path>=<<value>

Check a file for a particular value before running a test. The check line
can contain multiple files to check separated by a space, but each check
parameter needs to be of the form <path>=<value>