CHECKMK(1) CHECKMK(1)
NAME
checkmk - Awk script for generating C unit tests for use with the
Check unit testing framework.
SYNOPSIS
checkmk [ clean_mode=1 ] [ input-file ]
DESCRIPTION
Generate C-language source files containing unit tests for use with the
Check unit testing framework. The aim of this script is to automate
away some of the typical boilerplate one must write when writing a test
suite using Check: specifically, the instantiation of an SRunner,
Suite(s), and TCase(s), and the building of relationships between these
objects and the test functions.
This tool is intended to be used by those who are familiar with the
Check unit testing framework. Familiarity with the framework will be
assumed throughout this manual.
The Check framework, along with information regarding it, is available
at https://libcheck.github.io/check/
<URL:https://libcheck.github.io/check/>.
The input-file argument to checkmk uses a simple, C-preprocessor-like
syntax to declare test functions, and to describe their relationships
to Suites and TCases in Check. checkmk then uses this information to
automatically write a main() function containing all of the necessary
declarations, and whatever code is needed to run the test suites. The
final C-language output is printed to checkmk's standard output.
Facilities are provided for the insertion of user code into the gener-
ated main() function, to provide for the use of logging, test fixtures
or specialized exit values.
While it is possible to omit the input-file argument to checkmk and
provide the input file on checkmk's standard input instead, it is gen-
erally recommended to provide it as an argument. Doing this allows
checkmk to be aware of the file's name, to place references to it in
the initial comments of the C-language output, and to intersperse C
#line directives throughout, to facilitate in debugging problems by di-
recting the user to the original input file.
OPTIONS
The only officially supported option is specifying a true value (using
Awk's definition for "true") for the variable clean_mode. This causes
checkmk not to place appropriate #line directives in the source code,
which some might find to be unnecessary clutter.
The author recommends against the use of this option, as it will cause
C compilers and debugging tools to refer to lines in the automatically
generated output, rather than the original input files to checkmk. This
would encourage users to edit the output files instead of the original
input files, would make it difficult for intelligent editors or IDEs to
pull up the right file to edit, and could result in the fixes being
overwritten when the output files are regenerated.
#line directives are automatically suppressed when the input file is
provided on standard input instead of as a command-line argument.
BASIC EXAMPLE
In its most basic form, an input file can be simply a prologue and a
test function. Anything that appears before the first test function is
in the prologue, and will be copied into the output verbatim. The test
function is begun by a line in the form:
#test test_name
Where test_name is the name of your test function. This will be used to
name a C function, so it must be a valid C identifier.
Here is a small, complete example:
--------------------------------------------------
/* A complete test example */
#include <stdio.h>
#test the_test
int nc;
const char msg[] = "\n\n Hello, world!\n";
nc = printf("%s", msg);
ck_assert(nc == (sizeof(msg) - 1)); /* for terminating NUL. */
--------------------------------------------------
If you place the above into a file named basic_complete.ts and process
it using the following command:
$ checkmk basic_complete.ts > basic_complete.c
basic_complete.c will contain output similar to:
--------------------------------------------------
/*
* DO NOT EDIT THIS FILE. Generated by checkmk.
* Edit the original source file "in" instead.
*/
#include <check.h>
/* A complete test example */
#include <stdio.h>
START_TEST(the_test)
{
int nc;
const char msg[] = "\n\n Hello, world!\n";
nc = printf("%s", msg);
ck_assert(nc == (sizeof(msg) - 1)); /* for terminating NUL. */
}
END_TEST
int main(void)
{
Suite *s1 = suite_create("Core");
TCase *tc1_1 = tcase_create("Core");
SRunner *sr = srunner_create(s1);
int nf;
suite_add_tcase(s1, tc1_1);
tcase_add_test(tc1_1, the_test);
srunner_run_all(sr, CK_ENV);
nf = srunner_ntests_failed(sr);
srunner_free(sr);
return nf == 0 ? 0 : 1;
}
--------------------------------------------------
In real usage, basic_complete.c would also contain #line directives.
DIRECTIVE SUMMARY
Here is a complete summary of all the C-preprocessor-style directives
that are understood by checkmk. See below for more details.
# test test_name
# test-signal(signal) test_name
# test-exit(exit_code) test_name
# test-loop(start, end) test_name
# test-loop-signal(signal, start, end) test_name
# test-loop-exit(exit_code, start, end) test_name
# suite TestSuiteName
# tcase TestCaseName
# main-pre
# main-post
All directives are case-insensitive. Whitespace may appear at the be-
ginning of the line before the #, between the # and the directive, be-
tween the directive and any argument, and at the end of the line.
TEST-DEFINING DIRECTIVES
Here is a more detailed explanation of the directives that may be used
to define test functions and their containers.
TEST FUNCTIONS
# test test_name
# test-signal(signal) test_name
# test-exit(exit_code) test_name
# test-loop(start, end) test_name
# test-loop-signal(signal, start, end) test_name
# test-loop-exit(exit_code, start, end) test_name
These are the most basic directives for creating a template for input
to checkmk. They are the only directives that are required: there must
be at least one #test* directive appearing in the template, or checkmk
will fail with an error message. The #test* directives may be specified
several times, each one beginning the definition of a new test func-
tion.
The test_name argument will be used as the name of a test function in
the C-language output, so it must be a valid C identifier. That is, it
must begin with an alphabetic character or the underscore (_), followed
by optional alpha-numeric characters and/or underscores.
Universal Character Names (introduced in C99) are also allowed, of the
form \uXXXX or \UXXXXXXXX, where the X's represent hexadecimal digits.
It is an error to specify the same test_name in more than one #test*
directive, regardless of whether they are associated with different
test cases or suites.
See CHECKMK IDENTIFIERS for the list of identifiers which should be
avoided for use as test function names.
TEST SUITES
# suite TestSuiteName
This directive specifies the name of the test suite (Suite object in
the Check test framework) to which all future test cases (and their
test functions) will be added.
The TestSuiteName is a text string, and may contain any sort of charac-
ters at all (other than ASCII NUL character, and the newline, which
would terminate the directive). Any leading or trailing whitespace will
be omitted from the test suite name.
Starting a new test suite also begins a new test case, whose name is
identical to the new test suite. This test case name may be overridden
by a subsequent #tcase directive.
Note that a Suite object won't actually be defined by checkmk in the C
output, unless it is followed at some point by a #test directive (with-
out an intervening #suite). It is not an error for a #suite to have no
associated #test's; the #suite (and any associated #tcase's) simply
won't result in any action on the part of checkmk (and would therefore
be useless).
It is an error for a #suite directive to specify the same (case sensi-
tive) suite multiple times, unless the previous uses were not instanti-
ated by the presence of at least one associated #test directive.
If you do not specify a #suite directive before the first #test direc-
tive, checkmk performs the equivalent of an implicit #suite directive,
with the string "Core" as the value for TestSuiteName (this also im-
plies a "Core" test case object). This is demonstrated above in BASIC
EXAMPLE.
TEST CASES
# tcase TestCaseName
This directive specifies the name of the test case (TCase object in the
Check test framework) to which all future test functions will be added.
The #tcase works very in a way very similar to #suite. The TestCaseName
is a text string, and may contain arbitrary characters; and a TCase ob-
ject won't actually be defined unless it is followed by an associated
#test directive.
It is an error for a #tcase directive to specify the same (case sensi-
tive) test case multiple times, unless the previous uses were not in-
stantiated by the presence of at least one associated #test directive.
See also the #suite directive, described above.
USER CODE IN MAIN()
The C main() is automatically generated by checkmk, defining the neces-
sary SRunner's, Suite's, and TCase's required by the test-defining di-
rectives specified by the user.
For most situations, this completely automated main() is quite suitable
as-is. However, there are situations where one might wish to add custom
code to the main(). For instance, if the user wishes to:
• change the test timeout value via tcase_set_timeout(),
• specify Check's "no-fork-mode" via srunner_set_fork_status(),
• set up test fixtures for some test cases, via tcase_add_checked_fix-
ture() or tcase_add_unchecked_fixture(),
• set up test logging for the suite runner, via srunner_set_log()
or srunner_set_xml(), or
• perform custom wrap-up after the test suites have been run.
For these purposes, the #main-pre and #main-post directives have been
provided.
MAIN() PROLOGUE
# main-pre
The text following this directive will be placed verbatim into the body
of the generated main() function, just after checkmk's own local vari-
able declarations, and before any test running has taken place (indeed,
before even the relationships between the tests, test cases, and test
suites have been set up, though that fact shouldn't make much differ-
ence). Since checkmk has only just finished making its declarations, it
is permissible, even under strict 1990 ISO C guidelines, to make custom
variable declarations here.
Unlike the previously-described directives, #main-pre may be specified
at most once. It may not be preceded by the #main-post directive, and
no #suite, #tcase, or #test directive may appear after it.
#main-pre is a good place to tweak settings or set up test fixtures. Of
course, in order to do so, you need to know what names checkmk has used
to instantiate the SRunner's, Suite's, and TCase's.
CHECKMK IDENTIFIERS
Pointers to Suite's are declared using the pattern sX, where X is a
number that starts at 1, and is incremented for each subsequent #suite
directive. s1 always exists, and contains the test function declared
by the first #test directive. If that directive was not preceded by a
#suite, it will be given the name "Core".
Pointers to TCase's are declared using the pattern tcX_Y, where X cor-
responds to the number used for the name of the Suite that will contain
this TCase; and Y is a number that starts at 1 for each new Suite, and
is incremented for each TCase in that Suite.
A pointer to SRunner is declared using the identifier sr; there is also
an integer named nf which holds the number of test failures (after the
tests have run).
For obvious reasons, the user should not attempt to declare local iden-
tifiers in main(), or define any macros or test functions, whose names
might conflict with the local variable names used by checkmk. To summa-
rize, these names are:
sX
tcX_Y
sr
nf.
MAIN() EPILOGUE
# main-post
Though it is not as useful, checkmk also provides a #main-post direc-
tive to insert custom code at the end of main(), after the tests have
run. This could be used to clean up resources that were allocated in
the prologue, or to print information about the failed tests, or to
provide a custom exit status code.
Note that, if you make use of this directive, checkmk will not provide
a return statement: you will need to provide one yourself.
The #main-post directive may not be followed by any other directives
recognized by checkmk.
COMPREHENSIVE EXAMPLE
Now that you've gotten the detailed descriptions of the various direc-
tives, let's see it all put to action with this fairly comprehensive
template.
--------------------------------------------------
#include "mempool.h" /* defines MEMPOOLSZ, prototypes for
mempool_init() and mempool_free() */
void *mempool;
void mp_setup(void)
{
mempool = mempool_init(MEMPOOLSZ);
ck_assert_msg(mempool != NULL, "Couldn't allocate mempool.");
}
void mp_teardown(void)
{
mempool_free(mempool);
}
/* end of prologue */
#suite Mempool
#tcase MP Init
#test mempool_init_zero_test
mempool = mempool_init(0);
ck_assert_msg(mempool == NULL, "Allocated a zero-sized mempool!");
ck_assert_msg(mempool_error(), "Didn't get an error for zero alloc.");
/* "MP Util" TCase uses checked fixture. */
#tcase MP Util
#test mempool_copy_test
void *cp = mempool_copy(mempool);
ck_assert_msg(cp != NULL, "Couldn't perform mempool copy.");
ck_assert_msg(cp != mempool, "Copy returned original pointer!");
#test mempool_size_test
ck_assert(mempool_getsize(mempool) == MEMPOOLSZ);
#main-pre
tcase_add_checked_fixture(tc1_2, mp_setup, mp_teardown);
srunner_set_log(sr, "mplog.txt");
#main-post
if (nf != 0) {
printf("Hey, something's wrong! %d whole tests failed!\n", nf);
}
return 0; /* Harness checks for output, always return success
regardless. */
--------------------------------------------------
Plugging this into checkmk, we'll get output roughly like the follow-
ing:
--------------------------------------------------
/*
* DO NOT EDIT THIS FILE. Generated by checkmk.
* Edit the original source file "comprehensive.ts" instead.
*/
#include <check.h>
#include "mempool.h"
void *mempool;
void mp_setup(void)
{
...
}
void mp_teardown(void)
{
...
}
/* end of prologue */
START_TEST(mempool_init_zero_test)
{
...
}
END_TEST
START_TEST(mempool_copy_test)
{
...
}
END_TEST
START_TEST(mempool_size_test)
{
...
}
END_TEST
int main(void)
{
Suite *s1 = suite_create("Mempool");
TCase *tc1_1 = tcase_create("MP Init");
TCase *tc1_2 = tcase_create("MP Util");
SRunner *sr = srunner_create(s1);
int nf;
/* User-specified pre-run code */
tcase_add_checked_fixture(tc1_2, mp_setup, mp_teardown);
srunner_set_log(sr, "mplog.txt");
suite_add_tcase(s1, tc1_1);
tcase_add_test(tc1_1, mempool_init_zero_test);
suite_add_tcase(s1, tc1_2);
tcase_add_test(tc1_2, mempool_copy_test);
tcase_add_test(tc1_2, mempool_size_test);
srunner_run_all(sr, CK_ENV);
nf = srunner_ntests_failed(sr);
srunner_free(sr);
/* User-specified post-run code */
if (nf != 0) {
printf("Hey, something's wrong! %d whole tests failed!\n", nf);
}
return 0; /* Harness checks for output, always return success
regardless. */
}
--------------------------------------------------
AUTHOR
checkmk and this manual were written by Micah J Cowan.
Copyright (C) 2006, 2010 Micah J Cowan.
09 February 2010 CHECKMK(1)
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