openssl/test/README-dev.md

Guidelines for test developers
==============================

How to add recipes
------------------

For any test that you want to perform, you write a script located in
`test/recipes/`, named `{nn}-test_{name}.t`,
where `{nn}` is a two digit number and
`{name}` is a unique name of your choice.

Please note that if a test involves a new testing executable, you will need to
do some additions in test/build.info. Please refer to the section
["Changes to test/build.info"](README.md#changes-to-testbuildinfo) below.

Naming conventions
------------------

A test executable is named `test/{name}test.c`

A test recipe is named `test/recipes/{nn}-test_{name}.t`, where `{nn}` is a two
digit number and `{name}` is a unique name of your choice.

The number `{nn}` is (somewhat loosely) grouped as follows:

    00-04  sanity, internal and essential API tests
    05-09  individual symmetric cipher algorithms
    10-14  math (bignum)
    15-19  individual asymmetric cipher algorithms
    20-24  openssl commands (some otherwise not tested)
    25-29  certificate forms, generation and verification
    30-35  engine and evp
    60-79  APIs:
       60  X509 subsystem
       61  BIO subsystem
       65  CMP subsystem
       70  PACKET layer
    80-89  "larger" protocols (CA, CMS, OCSP, SSL, TSA)
    90-98  misc
    99     most time consuming tests [such as test_fuzz]

A recipe that just runs a test executable
-----------------------------------------

A script that just runs a program looks like this:

    #! /usr/bin/perl

    use OpenSSL::Test::Simple;

    simple_test("test_{name}", "{name}test", "{name}");

`{name}` is the unique name you have chosen for your test.

The second argument to `simple_test` is the test executable, and `simple_test`
expects it to be located in `test/`

For documentation on `OpenSSL::Test::Simple`,
do `perldoc util/perl/OpenSSL/Test/Simple.pm`.

A recipe that runs a more complex test
--------------------------------------

For more complex tests, you will need to read up on Test::More and
OpenSSL::Test.  Test::More is normally preinstalled, do `man Test::More` for
documentation.  For OpenSSL::Test, do `perldoc util/perl/OpenSSL/Test.pm`.

A script to start from could be this:

    #! /usr/bin/perl

    use strict;
    use warnings;
    use OpenSSL::Test;

    setup("test_{name}");

    plan tests => 2;                # The number of tests being performed

    ok(test1, "test1");
    ok(test2, "test1");

    sub test1
    {
        # test feature 1
    }

    sub test2
    {
        # test feature 2
    }

Changes to test/build.info
--------------------------

Whenever a new test involves a new test executable you need to do the
following (at all times, replace {NAME} and {name} with the name of your
test):

 * add `{name}` to the list of programs under `PROGRAMS_NO_INST`

 * create a three line description of how to build the test, you will have
   to modify the include paths and source files if you don't want to use the
   basic test framework:

       SOURCE[{name}]={name}.c
       INCLUDE[{name}]=.. ../include ../apps/include
       DEPEND[{name}]=../libcrypto libtestutil.a

Generic form of C test executables
----------------------------------

    #include "testutil.h"

    static int my_test(void)
    {
        int testresult = 0;                 /* Assume the test will fail    */
        int observed;

        observed = function();              /* Call the code under test     */
        if (!TEST_int_eq(observed, 2))      /* Check the result is correct  */
            goto end;                       /* Exit on failure - optional   */

        testresult = 1;                     /* Mark the test case a success */
    end:
        cleanup();                          /* Any cleanup you require      */
        return testresult;
    }

    int setup_tests(void)
    {
        ADD_TEST(my_test);                  /* Add each test separately     */
        return 1;                           /* Indicate success             */
    }

You should use the `TEST_xxx` macros provided by `testutil.h` to test all failure
conditions.  These macros produce an error message in a standard format if the
condition is not met (and nothing if the condition is met).  Additional
information can be presented with the `TEST_info` macro that takes a `printf`
format string and arguments.  `TEST_error` is useful for complicated conditions,
it also takes a `printf` format string and argument.  In all cases the `TEST_xxx`
macros are guaranteed to evaluate their arguments exactly once.  This means
that expressions with side effects are allowed as parameters.  Thus,

    if (!TEST_ptr(ptr = OPENSSL_malloc(..)))

works fine and can be used in place of:

    ptr = OPENSSL_malloc(..);
    if (!TEST_ptr(ptr))

The former produces a more meaningful message on failure than the latter.

Note that the test infrastructure automatically sets up all required environment
variables (such as `OPENSSL_MODULES`, `OPENSSL_CONF`, etc.) for the tests.
Individual tests may choose to override the default settings as required.