posix_spawn: more tests

[Bruno Haible]

I've added more unit tests for the posix_spawn and posix_spawnp modules.


2020-12-23  Bruno Haible  <bruno@clisp.org>

        posix_spawn tests: Add two more tests.
        * tests/test-posix_spawn-inherit0.c: New file, based on
        tests/test-posix_spawn-open2.c.
        * tests/test-posix_spawn-inherit1.c: New file, based on
        tests/test-posix_spawn-open2.c.
        * modules/posix_spawn-tests (Files): Add them.
        (Depends-on): Add fflush.
        (Makefile.am): Compile and run test-posix_spawn-inherit0 and
        test-posix_spawn-inherit1.

2020-12-23  Bruno Haible  <bruno@clisp.org>

        posix_spawn tests: Add another test.
        * tests/test-posix_spawn-open2.c: New file, based on
        tests/test-posix_spawn-open1.c.
        * modules/posix_spawn-tests (Files): Add it.
        (Makefile.am): Compile and run test-posix_spawn-open1.

2020-12-16  Bruno Haible  <bruno@clisp.org>

        posix_spawn_file_actions_addfchdir-tests: Rename test.
        * tests/test-posix_spawn-fchdir.c: Renamed from
        tests/test-posix_spawn5.c.
        * modules/posix_spawn_file_actions_addfchdir-tests (Files, Makefile.am):
        Update.

        posix_spawn_file_actions_addchdir-tests: Rename test.
        * tests/test-posix_spawn-chdir.c: Renamed from
        tests/test-posix_spawn4.c.
        * modules/posix_spawn_file_actions_addchdir-tests (Files, Makefile.am):
        Update.

        posix_spawn-tests: Rename test.
        * tests/test-posix_spawn-open1.c: Renamed from
        tests/test-posix_spawn3.c.
        * modules/posix_spawn-tests (Files, Makefile.am): Update.

        posix_spawnp-tests: Rename test.
        * tests/test-posix_spawn-dup2-stdin.c: Renamed from
        tests/test-posix_spawn2.c.
        * tests/test-posix_spawn-dup2-stdin.in.sh: Renamed from
        tests/test-posix_spawn2.in.sh.
        * modules/posix_spawnp-tests (Files, Makefile.am): Update.

        posix_spawnp-tests: Rename test.
        * tests/test-posix_spawn-dup2-stdout.c: Renamed from
        tests/test-posix_spawn1.c.
        * tests/test-posix_spawn-dup2-stdout.in.sh: Renamed from
        tests/test-posix_spawn1.in.sh.
        * modules/posix_spawnp-tests (Files, Makefile.am): Update.