catch2/extras/CatchShardTestsImpl.cmake

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# Copyright Catch2 Authors
# Distributed under the Boost Software License, Version 1.0.
# (See accompanying file LICENSE.txt or copy at
# https://www.boost.org/LICENSE_1_0.txt)
# SPDX-License-Identifier: BSL-1.0
# Indirection for CatchShardTests that allows us to delay the script
# file generation until build time.
# Expected args:
# * TEST_BINARY - full path to the test binary to run sharded
# * CTEST_FILE - full path to ctest script file to write to
# * TARGET_NAME - name of the target to shard (used for test names)
# * SHARD_COUNT - number of shards to split the binary into
# Optional args:
# * REPORTER_SPEC - reporter specs to be passed down to the binary
# * TEST_SPEC - test spec to pass down to the test binary
if(NOT EXISTS "${TEST_BINARY}")
message(FATAL_ERROR
"Specified test binary '${TEST_BINARY}' does not exist"
)
endif()
set(other_args "")
if (TEST_SPEC)
set(other_args "${other_args} ${TEST_SPEC}")
endif()
if (REPORTER_SPEC)
set(other_args "${other_args} --reporter ${REPORTER_SPEC}")
endif()
# foreach RANGE in cmake is inclusive of the end, so we have to adjust it
math(EXPR adjusted_shard_count "${SHARD_COUNT} - 1")
file(WRITE "${CTEST_FILE}"
"string(RANDOM LENGTH 8 ALPHABET \"0123456789abcdef\" rng_seed)\n"
"\n"
"foreach(shard_idx RANGE ${adjusted_shard_count})\n"
" add_test(${TARGET_NAME}-shard-" [[${shard_idx}]] "/${adjusted_shard_count}\n"
" ${TEST_BINARY}"
" --shard-index " [[${shard_idx}]]
" --shard-count ${SHARD_COUNT}"
" --rng-seed " [[0x${rng_seed}]]
" --order rand"
"${other_args}"
"\n"
" )\n"
"endforeach()\n"
)