curl: --test-duphandle in debug builds runs "duphandled"

Using this option (only available in debug builds) makes curl always
call curl_easy_duphandle() on the handle before using it.

curl: --test-duphandle in debug builds runs "duphandled"

Using this option (only available in debug builds) makes curl always
call curl_easy_duphandle() on the handle before using it.

To help us catch curl_easy_duphandle() mistakes better.

Add a CI job using this.

Bonus: the previous runtests option -e is now also supported as
--test-event

Closes #15504

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tests: Fix FILEFORMAT <file name=""> directive

Follow-up to dcc52095

Closes #15371

GHA: silence proselint warnings and an error

Fix new issues found by `proselint`.

Also:
- silence this technical warning:
```
:0: DeprecationWarning: /home/runner/.p

GHA: silence proselint warnings and an error

Fix new issues found by `proselint`.

Also:
- silence this technical warning:
```
:0: DeprecationWarning: /home/runner/.proselintrc was found instead of a JSON file. Rename to /home/runner/.proselintrc.json.
```
- fix an input filename.
`proselints` fails now if an input file is missing.

Reported-by: Jay Satiro
Bug: https://github.com/curl/curl/pull/15291#issuecomment-2410505100
Closes #15293

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tests: replace hard-coded `/dev/null` with variable

- add variable for the null device filename and use that in Perl code.
- initialize this variable with `NUL` on native Windows.
-

tests: replace hard-coded `/dev/null` with variable

- add variable for the null device filename and use that in Perl code.
- initialize this variable with `NUL` on native Windows.
- add `%DEV_NULL` variable and use it in tests.

Fixes `The system cannot find the path specified.` messages seen when
running `runtests.pl` with native Windows Perl.

Also adjust code to not break mcedit syntax highlighting.

Cherry-picked from #14949
Closes #15098

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tests: remove the %FTPTIME3 variable

Nothing uses it.

Ref: #15056
Closes #15064

tests: add codeset-utf8 as a feature

To avoid having to use <precheck> for tests that require UTF-8 support.

Closes #15039

tests: introduce %CLIENT6IP-NB

This is the %CLIENT6IP variable - but without outmost brackets since
some commmand lines need the address without the brackets. With this
variable we c

tests: introduce %CLIENT6IP-NB

This is the %CLIENT6IP variable - but without outmost brackets since
some commmand lines need the address without the brackets. With this
variable we can run three more tests without prechecks.

Closes #15039

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tests: make precheck for HTTP on 127.0.0.1 into a feature

It can now be required easily in <features> instead of having perl code
in a <precheck>.

Closes #15039

tests: postcheck is now in verify

Also introduce 'notexists' for verifying that directory entries do not
exist after a test. Now an explicit supported feature instead of using
"funny

tests: postcheck is now in verify

Also introduce 'notexists' for verifying that directory entries do not
exist after a test. Now an explicit supported feature instead of using
"funny" perl in postcheck.

Closes #15046

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FTP: partly revert eeb7c1280742f5c8fa48a4340fc1e1a1a2c7075a

Since ASCII transfers on FTP means sending CRLF line endings, we should
still keep converting them to LF-only on platforms whe

FTP: partly revert eeb7c1280742f5c8fa48a4340fc1e1a1a2c7075a

Since ASCII transfers on FTP means sending CRLF line endings, we should
still keep converting them to LF-only on platforms where text files
typically do not use CRLF.

This also DOES NOT convert existing CRLF line endings on ASCII uploads
but only does stand-alone LF => CRLF.

Regression from eeb7c1280742f5c8 shipped in 8.10.0

Reported-by: finkjsc on github
Fixes #14873
Closes #14875

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tests: tweak lock file handling and timers

- when server are killed by a test case, do not wait for the server lock
file to go away. These tests are mostly about client timeouts and th

tests: tweak lock file handling and timers

- when server are killed by a test case, do not wait for the server lock
file to go away. These tests are mostly about client timeouts and the
server will hang until killed.
- when killing a server successfully, check for a remaining lock file,
log its existence and remove it.
- lower the delay timings on SLOWDOWN by half
- add SLOWDOWNDATA server command to only slow down the FTP data bytes,
not the control ones.
- lower some timeout values

Closes #14835

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test475: verify a 72K ASCII FTP upload

Extended the test format and runtest.pl so that the verify/upload part
can be marked using crlf newlines even when the client/file does not
hav

test475: verify a 72K ASCII FTP upload

Extended the test format and runtest.pl so that the verify/upload part
can be marked using crlf newlines even when the client/file does not
have it.

Closes #14717

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GHA: run badwords check on tests/*.md too

With several wording updates accordingly.

Closes #14412

KNOWN_BUGS: mention AppleIDN and WinIDN test problems

Closes #14176
Closes #14387

tidy-up: OS names

Use these words and casing more consistently across text, comments and
one curl tool output:
AIX, ALPN, ANSI, BSD, Cygwin, Darwin, FreeBSD, GitHub, HP-UX, Linux,

tidy-up: OS names

Use these words and casing more consistently across text, comments and
one curl tool output:
AIX, ALPN, ANSI, BSD, Cygwin, Darwin, FreeBSD, GitHub, HP-UX, Linux,
macOS, MS-DOS, MSYS, MinGW, NTLM, POSIX, Solaris, UNIX, Unix, Unicode,
WINE, WebDAV, Win32, winbind, WinIDN, Windows, Windows CE, Winsock.

Mostly OS names and a few more.

Also a couple of other minor text fixups.

Closes #14360

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tests: sync feature names with `curl -V`

Some feature names used in tests had minor differences compared to
the well-known ones from `curl -V`. This patch syncs them to make test
res

tests: sync feature names with `curl -V`

Some feature names used in tests had minor differences compared to
the well-known ones from `curl -V`. This patch syncs them to make test
results easier to grok.

Closes #14183

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runtests: support %DATE for YYYY-MM-DD of right now

runtests: support %VERNUM

For the plain version number of the built curl without -DEV etc. Only
digits and dots.

FILEFORMAT.md: mentioned <file[num]> for "client"

They can be used to create more files.

Closes #14024

runtests: support crlf="yes" for the <stderr> section

tests: add -q as first option when invoking curl for tests

To reduce the risk that the user running the tests has a .curlrc present
that messes things up.

Support 'option="no-q"

tests: add -q as first option when invoking curl for tests

To reduce the risk that the user running the tests has a .curlrc present
that messes things up.

Support 'option="no-q"' for the <command> tag to switch it off on demand.
Use this new feature in test 433 and 436.

Ref: #13284
Closes #13387

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tests: support setting/using blank content env variables

- test450: remove --config from the keywords
- test2080: change return code
- test428: add --config as a keyword
- test42

tests: support setting/using blank content env variables

- test450: remove --config from the keywords
- test2080: change return code
- test428: add --config as a keyword
- test428: disable on Windows due to CI problems

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testutil: make runtests support %include

Using this instruction, a test case can include the contents of a file
into the test during the preprocessing.

Closes #12612

tests: add the timing-dependent keyword on several tests

These are ones likely to fail on heavily-loaded machines that alter the
normal test timing. Most of these tests already had the f

tests: add the timing-dependent keyword on several tests

These are ones likely to fail on heavily-loaded machines that alter the
normal test timing. Most of these tests already had the flaky keyword
since this condition makes them more likely to fail on CI.

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tests: fix formatting errors in `FILEFORMAT.md`.

Without the surrounding backticks, these tags get swallowed when the
markdown is rendered.

Closes #11777