fchdir tests: Fix test failure on native Windows

[Bruno Haible]

On native Windows, in a testdir of module 'fchdir' (but not in a testdir of
all of Gnulib), I'm seeing a test failure:

test-fchdir.c:74: assertion 'fchdir (fd) == 0' failed

What happens? fchdir.c contains logic for keeping track which file
descriptor corresponds to which directory. In the test's line

          int new_fd = dup (fd);

the information is expected to be copied from fd to new_fd. But that
does not happen, because 'dup' is not overridden.

This patch fixes it.


2023-04-26  Bruno Haible  <bruno@clisp.org>

        fchdir tests: Fix test failure on native Windows.
        * modules/fchdir-tests (Depends-on): Add dup.

diff --git a/modules/fchdir-tests b/modules/fchdir-tests
index 89ddf713ac..6ac141079c 100644
--- a/modules/fchdir-tests
+++ b/modules/fchdir-tests
@@ -6,6 +6,7 @@ tests/macros.h
 Depends-on:
 cloexec
 getcwd-lgpl
+dup
 
 configure.ac: