CMakeLists.txt

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

enable_language(C ASM)

# Provides the unity library
add_subdirectory(Unity)

# Allows us to use ctest
enable_testing()

# ctest will not rebuild targets before running tests, so we instead make a target
# that invokes ctest.
add_custom_target(ctest COMMAND ${CMAKE_CTEST_COMMAND} --verbose)

# Function to add a unit test in a simple way
# Example usage:
#
#     add_unit_test(
#        TARGET_NAME test_minimal
#        SOURCE_FILES ${CMAKE_SOURCE_DIR}/src/0_minimal/test/test_minimal.c
#     )
#
function(add_unit_test)
    # Parse keyword arguments
    set(_flags)
    set(_single_values TARGET_NAME)
    set(_list_values SOURCE_FILES)
    cmake_parse_arguments(ARG "${_flags}" "${_single_values}" "${_list_values}" ${ARGN})

    # Assume the first source file is the test file
    list(GET ARG_SOURCE_FILES 0 TEST_SOURCE)

    # Place the autogenerated test runner in the build directory
    set(TEST_RUNNER ${CMAKE_CURRENT_BINARY_DIR}/${ARG_TARGET_NAME}_runner.c)

    # Define how the test runner should be generated
    add_custom_command(
        OUTPUT ${TEST_RUNNER}
        COMMAND ruby ${CMAKE_SOURCE_DIR}/Unity/auto/generate_test_runner.rb ${TEST_SOURCE} ${TEST_RUNNER}
        DEPENDS ${ARG_SOURCE_FILES}
    )

    # Define the executable for the test runner
    add_executable(${ARG_TARGET_NAME} ${TEST_RUNNER} ${ARG_SOURCE_FILES})

    # Enable testing with ctest. Running the test is just a matter of running the executable.
    add_test(NAME ${ARG_TARGET_NAME} COMMAND ${ARG_TARGET_NAME})

    # Always link in the Unity library
    target_link_libraries(${ARG_TARGET_NAME} PUBLIC unity)

    # Add dependencies so the test runner rebuilds everything when any of the sources change
    add_dependencies(ctest ${ARG_TARGET_NAME})
endfunction()

add_subdirectory(src)