DIFF_PASSED=$$(bc <<<"$$TESTS_PASSED - $$LAST_PASSED"); \
DIFF_FAILED=$$(bc <<<"$$TESTS_FAILED - $$LAST_FAILED"); \
printf " %+d/%+d" $$DIFF_PASSED $$DIFF_FAILED >>$@; \
DIFF_PASSED=$$(bc <<<"$$TESTS_PASSED - $$LAST_PASSED"); \
DIFF_FAILED=$$(bc <<<"$$TESTS_FAILED - $$LAST_FAILED"); \
printf " %+d/%+d" $$DIFF_PASSED $$DIFF_FAILED >>$@; \