Using the Power to Prove

Using the
Power to Prove
DeNA Co., Ltd.
Kazuho Oku

Do you know prove?
Have you ever used it?
Sep 20 2013 Using the Power to Prove 2

Prove is…
command-line interface of Test::Harness
Test::Harness is the test runner
$ make test
PERL_DL_NONLAZY=1 /usr/bin/perl "-MExtUtils::Command::MM" "-e"
"test_harness(0, 'inc', 'blib/lib', 'blib/arch')" t/00-base.t t/01-new.t t/02-use.t
t/03-use-error.t t/04-use-defaults.t
t/00-base.t .......... ok
t/01-new.t ........... ok
…
$ prove
t/00-base.t .......... ok
t/01-new.t ........... ok
…

Test Anything Protocol (TAP)
Test::Harness runs the scripts and
aggregates the results
test scripts return the data using TAP
$ perl t/00-base.t
1..14
ok 1 - use Class::Accessor::Lite;
ok 2 - call mk_accessors
ok 3
ok 4
…

History of Test::Harness and TAP
TAP exists since Perl 1
Test::Harness is part of Perl core
and is part of Linux Standards Base
bindings exist for many programming
languages
 http://en.wikipedia.org/wiki/Test_Anything_Protocol

Prove has many powerful options
$ prove -j 8 --state hot,fast,save
- runs 8 tests in parallel
- run the tests that failed first
- run the fast tests first,
and then others that takes time
- update the test stats

Can we write tests in other programming
languages, and aggregate the results
using prove?

Prove runs scripts written in any language
but how?
$ cat bf.t
#! /usr/local/bin/yabi
-[----->+<]>--.---..+++.>++++++++++.-[------->+<]>.----.-[++>---<]>+.[--
>+++<]>+.>++++++++++.
$ yabi bf.t
1..1
ok 1
$ prove bf.t
bf.t .. ok
All tests successful.
Files=1, Tests=1, 0 wallclock secs ( 0.02 usr + 0.00 sys = 0.02 CPU)
Result: PASS

PerlProve runs scripts written in any language
Perl understands the shebang
$ cat bf.t
#! /usr/local/bin/yabi
-[----->+<]>--.---..+++.>++++++++++.-[------->+<]>.----.-[++>---<]>+.[--
>+++<]>+.>++++++++++.
$ perl bf.t
1..1
ok 1

PerlProve runs scripts written in any language
but not binary executables…
$ cat bin.c
#include <stdio.h>
int main(int argc, char** argv)
{
printf("1..1n");
printf("ok 1n");
return 0;
}
$ perl bin
Unrecognized character xCF; marked by <-- HERE after <-- HERE near
column 1 at bin line 1.

prove --exec '' solves the problem
why?
$ prove –h
…
-e, --exec Interpreter to run the tests ('' for compiled tests.)
…
$ prove --exec '' bin
bin .. open3: exec of bin failed at
/System/Library/Perl/5.12/TAP/Parser/Iterator/Process.pm line 163.
bin .. Dubious, test returned 255 (wstat 65280, 0xff00)
No subtests run

prove --exec '' solves the problem
specify the paths, or add . to $PATH
but would test scripts stop running on Windows
$ prove --exec '' t/bin
t/bin .. ok
Result: PASS
$ PATH=".:$PATH" prove --exec '' bin
bin .. ok
Result: PASS

Extensions can be other than .t
use: --ext ""
$ prove --ext '' --exec '' .
./test.bf ... ok
./test.out .. ok
./test.sh ... ok
Result: PASS

.proverc
Save the prove options for the project
$ cat .proverc
--ext '' --exec ''
$ prove .
./test.bf ... ok
./test.out .. ok
./test.sh ... ok
Result: PASS

Test scripts are searched by default from t/
$ cat .proverc
--ext '' --exec ''
$ prove
t/test.bf ... ok
t/test.out .. ok
t/test.sh ... ok
Result: PASS

Prove is powerful! Can we run programs
other than test scripts?

Running things other than test scripts
cron tasks
service monitoring
$ ls t
http.t memcached.t mysql.t ping.t
smtp.t
$ prove
t/http.t ....... ok
t/memcached.t .. ok
t/mysql.t ...... ok
t/ping.t ....... ok
t/smtp.t ....... ok

Conclusion

Conclusion
Prove is a proven task runner
can run any kind of tasks and generate a report
preinstalled on most systems
uses TAP - an established protocol

Using the Power to Prove

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