cmake/Modules/UnitTestFramework.cmake

#
# SPDX-License-Identifier: BSD-3-Clause
# SPDX-FileCopyrightText: Copyright TF-RMM Contributors.
#

#[=======================================================================[.rst:
rmm_build_unittest
------------------

.. default-domain:: unit tests

.. command:: rmm_build_unittest

Build a unit test group for a given target

.. code:: cmake

    rmm_build_unittest(NAME <name> TARGET <target> SOURCES <sources>
                       [RUN_ISOLATED_TESTS <LIST of tests to run>]
                       [LIBRARIES <libraries_to_link>]
                       [ITERATIONS <iterations>])

This helper function simplifies the mechanics to setup and enable an unit test.

Basics
^^^^^^

Every unit test configuration has the following parameters (defined as
strings):

- ``NAME`` Name of the test. It must match the name of the CppUtest test group.
- ``TARGET`` Target where the tests will be linked against.
- ``SOURCES`` Source files for the tests. This is usually a single C++ file.
- ``RUN_ISOLATED_TESTS`` Optional parameter that specifies a list of tests
                         implemented within ``SOURCES`` to be run. When this
                         list is specified, the binary is re-spawned for each
                         test and only executed once (``ITERATIONS`` is
                         ignored). Any test not included on the list will be
                         ignored.
                         If this parameter is not used, all the tests included
                         in the group will be run automatically by CppUTest,
                         the number of times specified by ``ITERATIONS``
- ``LIBRARIES`` Optional parameter to define libraries to link against
                the tests.
- ``ITERATIONS`` Optional parameter that defines how many times the test will
                 run. By default it is 1 times.
                 This option is ignored when using ``RUN_ISOLATED_TESTS``

#]=======================================================================]

if(RMM_UNITTESTS)
    include("${CMAKE_SOURCE_DIR}/cmake/BuildCppUTest.cmake")

    # Clean ${IMPORT_TEST_GROUPS}, used to generate test_groups.h later.
    SET(IMPORT_TEST_GROUPS "" CACHE INTERNAL "IMPORT_TEST_GROUP List")

    # Generate an empty test_groups.h, needed if we don't have unittests
    configure_file(${CMAKE_SOURCE_DIR}/plat/host/host_test/src/test_groups.h.in
                   ${CMAKE_BINARY_DIR}/plat/host/host_test/src/test_groups.h
                   @ONLY)

    # Include CTest for unittests
    include(CTest)

    # Custom target to run the unit tests
    add_custom_target(run-unittests
        WORKING_DIRECTORY "${CMAKE_BINARY_DIR}"
        COMMAND ctest -C "$<CONFIG>"
        DEPENDS rmm.elf rmm.map
    )
endif()

function(rmm_build_unittest)
    if(RMM_UNITTESTS)
        set(_options "")
        set(_multi_args "SOURCES;LIBRARIES;RUN_ISOLATED_TESTS")
        set(_single_args "NAME;TARGET;ITERATIONS")

        cmake_parse_arguments(
            arg "${_options}" "${_single_args}" "${_multi_args}" ${ARGN})

        if("NAME" IN_LIST arg_KEYWORDS_MISSING_VALUES OR
            NOT DEFINED arg_NAME)
            message(FATAL_ERROR "Missing unit test name")
        endif()

        if("TARGET" IN_LIST arg_KEYWORDS_MISSING_VALUES OR
            NOT DEFINED arg_TARGET)
            message(FATAL_ERROR "Missing test target")
        endif()

        if("SOURCES" IN_LIST arg_KEYWORDS_MISSING_VALUES OR
            NOT DEFINED arg_SOURCES)
            message(FATAL_ERROR "Missing test sources")
        endif()

        if("ITERATIONS" IN_LIST arg_KEYWORDS_MISSING_VALUES OR
            NOT DEFINED arg_ITERATIONS)
            set(arg_ITERATIONS "1")
        endif()

        target_sources("${arg_TARGET}"
            PRIVATE ${arg_SOURCES})

        target_link_libraries("${arg_TARGET}"
            PRIVATE CppUTest ${arg_LIBRARIES})

        # Add the test to the CMake test builder, so we can automate
        # the test run process.
        if("RUN_ISOLATED_TESTS" IN_LIST arg_KEYWORDS_MISSING_VALUES OR
            NOT DEFINED arg_RUN_ISOLATED_TESTS)
            # Run all tests at once
            add_test(NAME "${arg_NAME}"
                    COMMAND ${CMAKE_BINARY_DIR}/rmm.elf
                            -g${arg_NAME}
                            -r${arg_ITERATIONS})
        else()
            # Register a test for each test case, so each one on them can
            # run on isolation.
            foreach(TEST IN LISTS arg_RUN_ISOLATED_TESTS)
                add_test(NAME "${arg_NAME}::${TEST}"
                         COMMAND ${CMAKE_BINARY_DIR}/rmm.elf
                                 -sg${arg_NAME}
                                 -sn${TEST})
            endforeach()
        endif()

        # Use CppUtest IMPORT_TEST_GROUP macro to explicitly include the new test
        # group. This is needed as otherwise the linker will ignore the test code.
        SET(IMPORT_TEST_GROUPS "${IMPORT_TEST_GROUPS} IMPORT_TEST_GROUP(${arg_NAME});"
            CACHE INTERNAL "IMPORT_TEST_GROUP List")

        # Generate the test_groups.h
        configure_file(${CMAKE_SOURCE_DIR}/plat/host/host_test/src/test_groups.h.in
                       ${CMAKE_BINARY_DIR}/plat/host/host_test/src/test_groups.h
                       @ONLY)
    endif()
endfunction()