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When running inline tests, jenga first gets the output of
[inline_tests_runner -list-partitions], then loops through those lines, testing
the partitions one-by-one. If code linked into [inline_tests_runner] produces
other toplevel output, it can mangle the partition list and cause jenga to try
running nonexistent tests instead (while the real ones are silently ignored).
$ cd $TEST_DIR
$ ./inline_tests_runner -list-partitions
PRINTED FROM TEST FILEtest
$ ./inline_tests_runner -list-partitions | while read partition; do ./inline_tests_runner -partition "$partition"; done
PRINTED FROM TEST FILE (no-eol)
Since the test succeeded, it means no tests were run.
Instead, we use the [-list-partitions-into-file] flag, which will separate the
partition list from stray STDIO:
$ PARTITION_FILE=tmp.partitions
$ touch "${PARTITION_FILE}"
$ ./inline_tests_runner -list-partitions-into-file $PARTITION_FILE
PRINTED FROM TEST FILE (no-eol)
$ cat $PARTITION_FILE
test
$ while read partition; do ./inline_tests_runner -partition "$partition"; done < $PARTITION_FILE
File "test.ml", line 2, characters 0-18: <<false>> is false.
FAILED 1 / 1 tests
PRINTED FROM TEST FILE (no-eol)
[2]
This time, the test failed (as it should).
To help catch situations where jenga and the inline_tests_runner can't
communicate over the filesystem (because, for example, the inline_tests_runner
has been wrapped in bwrap), the inline_tests_runner complains if asked to list
partitions into a file that does not exist.
$ rm $PARTITION_FILE
$ OCAMLRUNPARAM=b=0 ./inline_tests_runner -list-partitions-into-file $PARTITION_FILE
PRINTED FROM TEST FILEFatal error: exception Sys_error("tmp.partitions: No such file or directory")
[2]
In reality, jenga does not interact with the inline test runner using real
files. Instead, it runs a script that manipulates some file descriptors to
collect the partition list like so:
$ exec {stdout}>&1; ./inline_tests_runner -list-partitions-into-file /dev/fd/${stdout} > /dev/null
test
$ ( exec {stdout}>&1; ./inline_tests_runner -list-partitions-into-file /dev/fd/${stdout} > /dev/null ) | while read partition; do ./inline_tests_runner -partition "$partition"; done
File "test.ml", line 2, characters 0-18: <<false>> is false.
FAILED 1 / 1 tests
PRINTED FROM TEST FILE (no-eol)
[2]
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