transmission/tests/utils/run_transmission_show.cmake

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# compare the output of transmission-show to a reference file.
# returns 0 if the files match, nonzero otherwise.
##
if(CMAKE_VERSION VERSION_LESS 3.14)
# --ignore-eol was introduced in CMake 3.14
message(status "skipping transmission-show test; cmake version too old")
else()
get_filename_component(torrent_basename "${torrent_file}" NAME)
set(output_file ${CMAKE_CURRENT_BINARY_DIR}/${torrent_basename}.out)
message(STATUS "transmission_show ${transmission_show}")
message(STATUS " input_file ${torrent_file}")
message(STATUS " output_file ${output_file}")
message(STATUS " reference_file ${reference_file}")
# The app's output includes timestamps, so fake our TZ to ensure
# the test doesn't depend on the physical TZ of the test machine
set(ENV{TZ} "UTC")
execute_process(
COMMAND ${transmission_show} ${torrent_file}
OUTPUT_FILE ${output_file})
execute_process(
COMMAND ${CMAKE_COMMAND} -E compare_files --ignore-eol ${reference_file} ${output_file}
RESULT_VARIABLE STATUS)
if(STATUS AND NOT STATUS EQUAL 0)
file(READ ${reference_file} CONTENTS)
message("EXPECTED CONTENTS (${reference_file}):")
message(${CONTENTS})
file(READ ${output_file} CONTENTS)
message("RECEIVED CONTENTS (${output_file}):")
message(${CONTENTS})
find_program(DIFF_EXEC diff)
if(DIFF_EXEC)
message("DIFF:")
execute_process(COMMAND ${DIFF_EXEC} -u ${output_file} ${reference_file})
endif()
file(REMOVE ${output_file})
message(FATAL_ERROR "failed: files '${reference_file}' and '${output_file}' do not match")
else()
file(REMOVE ${output_file})
message("passed")
endif()
endif()