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README

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The curl Test Suite

1. Running
1.1 Requires to run
1.2 Port numbers used by test servers
1.3 Test servers
1.4 Run
1.5 Shell startup scripts
1.6 Memory test
1.7 Debug
1.8 Logs
1.9 Test input files
1.10 Code coverage
1.11 Remote testing

2. Numbering
2.1 Test case numbering

3. Write tests
3.1 test data
3.2 curl tests
3.3 libcurl tests
3.4 unit tests

4. TODO
4.1 More protocols
4.2 SOCKS auth

==============================================================================

1. Running

1.1 Requires to run

perl (and a unix-style shell)
python (and a unix-style shell)
diff (when a test fails, a diff is shown)
stunnel (for HTTPS and FTPS tests)
OpenSSH or SunSSH (for SCP, SFTP and SOCKS4/5 tests)
nghttpx (for HTTP/2 tests)
nroff (for --manual tests)

1.2 Port numbers used by test servers

- TCP/8990 for HTTP
- TCP/8991 for HTTPS
- TCP/8992 for FTP
- TCP/8993 for FTPS
- TCP/8994 for HTTP IPv6
- TCP/8995 for FTP (2)
- TCP/8996 for FTP IPv6
- UDP/8997 for TFTP
- UDP/8998 for TFTP IPv6
- TCP/8999 for SCP/SFTP
- TCP/9000 for SOCKS
- TCP/9001 for POP3
- TCP/9002 for POP3 IPv6
- TCP/9003 for IMAP
- TCP/9004 for IMAP IPv6
- TCP/9005 for SMTP
- TCP/9006 for SMTP IPv6
- TCP/9007 for RTSP
- TCP/9008 for RTSP IPv6
- TCP/9009 for GOPHER
- TCP/9010 for GOPHER IPv6
- TCP/9011 for HTTPS server with TLS-SRP support
- TCP/9012 for HTTPS IPv6 server with TLS-SRP support
- TCP/9013 for HTTP proxy server for CONNECT
- TCP/9014 for HTTP pipelining server
- TCP/9015 for HTTP/2 server
- TCP/9016 for DICT server
- TCP/9017 for SMB server
- TCP/9018 for SMBS server (reserved)
- TCP/9019 for TELNET server with negotiation support

1.3 Test servers

The test suite runs simple FTP, POP3, IMAP, SMTP, HTTP and TFTP stand-alone
servers on the ports listed above to which it makes requests. For SSL tests,
it runs stunnel to handle encryption to the regular servers. For SSH, it
runs a standard OpenSSH server. For SOCKS4/5 tests SSH is used to perform
the SOCKS functionality and requires a SSH client and server.

The base port number (8990), which all the individual port numbers are
indexed from, can be set explicitly using runtests.pl' -b option to allow
running more than one instance of the test suite simultaneously on one
machine, or just move the servers in case you have local services on any of
those ports.

The HTTP server supports listening on a Unix domain socket, the default
location is 'http.sock'.

1.4 Run

'./configure && make && make test'. This builds the test suite support code
and invokes the 'runtests.pl' perl script to run all the tests. Edit the top
variables of that script in case you have some specific needs, or run the
script manually (after the support code has been built).

The script breaks on the first test that doesn't do OK. Use -a to prevent
the script from aborting on the first error. Run the script with -v for more
verbose output. Use -d to run the test servers with debug output enabled as
well. Specifying -k keeps all the log files generated by the test intact.

Use -s for shorter output, or pass test numbers to run specific tests only
(like "./runtests.pl 3 4" to test 3 and 4 only). It also supports test case
ranges with 'to', as in "./runtests 3 to 9" which runs the seven tests from
3 to 9. Any test numbers starting with ! are disabled, as are any test
numbers found in the files data/DISABLED or data/DISABLED.local (one per
line). The latter is meant for local temporary disables and will be ignored
by git.

When -s is not present, each successful test will display on one line the
test number and description and on the next line a set of flags, the test
result, current test sequence, total number of tests to be run and an
estimated amount of time to complete the test run. The flags consist of
these letters describing what is checked in this test:

s stdout
d data
u upload
p protocol
o output
e exit code
m memory
v valgrind

1.5 Shell startup scripts

Tests which use the ssh test server, SCP/SFTP/SOCKS tests, might be badly
influenced by the output of system wide or user specific shell startup
scripts, .bashrc, .profile, /etc/csh.cshrc, .login, /etc/bashrc, etc. which
output text messages or escape sequences on user login. When these shell
startup messages or escape sequences are output they might corrupt the
expected stream of data which flows to the sftp-server or from the ssh
client which can result in bad test behaviour or even prevent the test
server from running.

If the test suite ssh or sftp server fails to start up and logs the message
'Received message too long' then you are certainly suffering the unwanted
output of a shell startup script. Locate, cleanup or adjust the shell
script.

1.6 Memory test

The test script will check that all allocated memory is freed properly IF
curl has been built with the CURLDEBUG define set. The script will
automatically detect if that is the case, and it will use the
'memanalyze.pl' script to analyze the memory debugging output.

Also, if you run tests on a machine where valgrind is found, the script will
use valgrind to run the test with (unless you use -n) to further verify
correctness.

runtests.pl's -t option will enable torture testing mode, which runs each
test many times and makes each different memory allocation fail on each
successive run. This tests the out of memory error handling code to ensure
that memory leaks do not occur even in those situations. It can help to
compile curl with CPPFLAGS=-DMEMDEBUG_LOG_SYNC when using this option, to
ensure that the memory log file is properly written even if curl crashes.

1.7 Debug

If a test case fails, you can conveniently get the script to invoke the
debugger (gdb) for you with the server running and the exact same command
line parameters that failed. Just invoke 'runtests.pl <test number> -g' and
then just type 'run' in the debugger to perform the command through the
debugger.

1.8 Logs

All logs are generated in the log/ subdirectory (it is emptied first in the
runtests.pl script). Use runtests.pl -k to force it to keep the temporary
files after the test run since successful runs will clean it up otherwise.

1.9 Test input files

All test cases are put in the data/ subdirectory. Each test is stored in the
file named according to the test number.

See FILEFORMAT for the description of the test case files.

1.10 Code coverage

gcc provides a tool that can determine the code coverage figures for
the test suite. To use it, configure curl with
CFLAGS='-fprofile-arcs -ftest-coverage -g -O0'. Make sure you run the normal
and torture tests to get more full coverage, i.e. do:

make test
make test-torture

The graphical tool ggcov can be used to browse the source and create
coverage reports on *NIX hosts:

ggcov -r lib src

The text mode tool gcov may also be used, but it doesn't handle object files
in more than one directory very well.

1.11 Remote testing

The runtests.pl script provides some hooks to allow curl to be tested on a
machine where perl can not be run. The test framework in this case runs on
a workstation where perl is available, while curl itself is run on a remote
system using ssh or some other remote execution method. See the comments at
the beginning of runtests.pl for details.

2. Numbering

2.1 Test case numbering

1 - 99 HTTP
100 - 199 FTP
200 - 299 FILE
300 - 399 HTTPS
400 - 499 FTPS
500 - 599 libcurl source code tests, not using the curl command tool
600 - 699 SCP/SFTP
700 - 799 SOCKS4 (even numbers) and SOCK5 (odd numbers)
800 - 849 IMAP
850 - 899 POP3
900 - 999 SMTP
1000 - 1299 miscellaneous
1300 - 1399 unit tests
1400 - 1499 miscellaneous
1500 - 1599 libcurl source code tests, not using the curl command tool
(same as 5xx)
1600 - 1699 unit tests
2000 - x multiple sequential protocols per test case

There's nothing in the system that *requires* us to keep within these number
series.

3. Write tests

Here's a quick description on writing test cases. We basically have three
kinds of tests: the ones that test the curl tool, the ones that build small
applications and test libcurl directly and the unit tests that test
individual (possibly internal) functions.

3.1 test data

Each test has a master file that controls all the test data. What to read,
what the protocol exchange should look like, what exit code to expect and
what command line arguments to use etc.

These files are tests/data/test[num] where [num] is described in section 2
of this document, and the XML-like file format of them is described in the
separate tests/FILEFORMAT document.

3.2 curl tests

A test case that runs the curl tool and verifies that it gets the correct
data, it sends the correct data, it uses the correct protocol primitives
etc.

3.3 libcurl tests

The libcurl tests are identical to the curl ones, except that they use a
specific and dedicated custom-built program to run instead of "curl". This
tool is built from source code placed in tests/libtest and if you want to
make a new libcurl test that is where you add your code.

3.4 unit tests

Unit tests are tests in the 13xx sequence and they are placed in tests/unit.
There's a tests/unit/README describing the specific set of checks and macros
that may be used when writing tests that verify behaviors of specific
individual functions.

The unit tests depend on curl being built with debug enabled.

4. TODO

4.1 More protocols

Add tests for TELNET, LDAP, DICT...

4.2 SOCKS auth

SOCKS4/5 test deficiencies - no proxy authentication tests as SSH (the
test mechanism) doesn't support them