iio: Add basic unit test for iio_format_value()
authorLars-Peter Clausen <lars@metafoo.de>
Tue, 15 Dec 2020 19:17:43 +0000 (20:17 +0100)
committerJonathan Cameron <Jonathan.Cameron@huawei.com>
Thu, 11 Mar 2021 20:47:00 +0000 (20:47 +0000)
commit0bf49ffbfe949df21e95b8f95b5f308db379ac74
tree61a2f9f13c0354190dc0d720a21089164affd721
parent38a52cdef5b3ba2e4ac6b24a073a231e04d2c552
iio: Add basic unit test for iio_format_value()

The IIO core provides a function to do formatting of fixedpoint numbers.

In the past there have been some issues with the implementation of the
function where for example negative numbers were not handled correctly.

Introduce a basic unit test based on kunit that tests the function and
ensures that the generated output matches the expected output.

This gives us some confidence that future modifications to the function
implementation will not break ABI compatibility.

To run the unit tests follow the kunit documentation and add

  CONFIG_IIO=y
  CONFIG_IIO_TEST_FORMAT=y

to the .kunitconfig and run

  > ./tools/testing/kunit/kunit.py run
  Configuring KUnit Kernel ...
  Building KUnit Kernel ...
  Starting KUnit Kernel ...
  ============================================================
  ======== [PASSED] iio-format ========
  [PASSED] iio_test_iio_format_value_integer
  [PASSED] iio_test_iio_format_value_fixedpoint
  [PASSED] iio_test_iio_format_value_fractional
  [PASSED] iio_test_iio_format_value_fractional_log2
  [PASSED] iio_test_iio_format_value_multiple
  ============================================================
  Testing complete. 21 tests run. 0 failed. 0 crashed.
  Elapsed time: 8.242s total, 0.001s configuring, 3.865s building, 0.000s running

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Link: https://lore.kernel.org/r/20201215191743.2725-3-lars@metafoo.de
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
drivers/iio/Kconfig
drivers/iio/Makefile
drivers/iio/test/Kconfig [new file with mode: 0644]
drivers/iio/test/Makefile [new file with mode: 0644]
drivers/iio/test/iio-test-format.c [new file with mode: 0644]