macro(require file)
    include("${CMAKE_CURRENT_LIST_DIR}/../cmake/${file}.cmake")
    set(FILE_UNDER_TEST ${file})
endmacro()

macro(describe subject)
    message(STATUS "Describe: ${subject}")
    set(SUBJECT ${subject})
endmacro()

macro(when message)
    message(STATUS "when ${message}")
    set(CONTEXT "when ${message}")
endmacro()

macro(it behavior)
    set(CURRENT_BEHAVIOR ${behavior})
endmacro()

function(expect condition value)
    cmake_language(CALL ${FILE_UNDER_TEST})

    if(${condition} STREQUAL "TO_BE")
        if("${${SUBJECT}}" STREQUAL "${value}")
            message(STATUS "  PASSED: ${CONTEXT} ${SUBJECT} ${CURRENT_BEHAVIOR}")
        else()
            message(FATAL_ERROR "  FAILED: ${CONTEXT} ${SUBJECT} ${CURRENT_BEHAVIOR}\n    Expected ${SUBJECT} to be [${value}], but got [${${SUBJECT}}]")
        endif()
    endif()
endfunction()