Test::Harness(3perl) - phpMan

Test::Harness(3perl) Perl Programmers Reference Guide Test::Harness(3perl)

NAME
Test::Harness - Run Perl standard test scripts with statistics

VERSION
Version 2.64

SYNOPSIS
use Test::Harness;

runtests(@test_files);

DESCRIPTION
STOP! If all you want to do is write a test script, consider using Test::Simple.
Test::Harness is the module that reads the output from Test::Simple, Test::More and other
modules based on Test::Builder. You don't need to know about Test::Harness to use those
modules.

Test::Harness runs tests and expects output from the test in a certain format. That
format is called TAP, the Test Anything Protocol. It is defined in Test::Harness::TAP.

"Test::Harness::runtests(@tests)" runs all the testscripts named as arguments and checks
standard output for the expected strings in TAP format.

The prove utility is a thin wrapper around Test::Harness.

Taint mode
Test::Harness will honor the "-T" or "-t" in the #! line on your test files. So if you
begin a test with:

#!perl -T

the test will be run with taint mode on.

Configuration variables.
These variables can be used to configure the behavior of Test::Harness. They are exported
on request.

$Test::Harness::Verbose
The package variable $Test::Harness::Verbose is exportable and can be used to let
"runtests()" display the standard output of the script without altering the behavior
otherwise. The prove utility's "-v" flag will set this.

$Test::Harness::switches
The package variable $Test::Harness::switches is exportable and can be used to set
perl command line options used for running the test script(s). The default value is
"-w". It overrides "HARNESS_PERL_SWITCHES".

$Test::Harness::Timer
If set to true, and "Time::HiRes" is available, print elapsed seconds after each test
file.

Failure
When tests fail, analyze the summary report:

t/base..............ok
t/nonumbers.........ok
t/ok................ok
t/test-harness......ok
t/waterloo..........dubious
Test returned status 3 (wstat 768, 0x300)
DIED. FAILED tests 1, 3, 5, 7, 9, 11, 13, 15, 17, 19
Failed 10/20 tests, 50.00% okay
Failed Test Stat Wstat Total Fail List of Failed
---------------------------------------------------------------
t/waterloo.t 3 768 20 10 1 3 5 7 9 11 13 15 17 19
Failed 1/5 test scripts, 80.00% okay. 10/44 subtests failed, 77.27% okay.

Everything passed but t/waterloo.t. It failed 10 of 20 tests and exited with non-zero
status indicating something dubious happened.

The columns in the summary report mean:

Failed Test
The test file which failed.

Stat
If the test exited with non-zero, this is its exit status.

Wstat
The wait status of the test.

Total
Total number of tests expected to run.

Fail
Number which failed, either from "not ok" or because they never ran.

List of Failed
A list of the tests which failed. Successive failures may be abbreviated (ie. 15-20
to indicate that tests 15, 16, 17, 18, 19 and 20 failed).

FUNCTIONS
The following functions are available.

runtests( @test_files )
This runs all the given @test_files and divines whether they passed or failed based on
their output to STDOUT (details above). It prints out each individual test which failed
along with a summary report and a how long it all took.

It returns true if everything was ok. Otherwise it will "die()" with one of the messages
in the DIAGNOSTICS section.

execute_tests( tests => \@test_files, out => \*FH )
Runs all the given @test_files (just like "runtests()") but doesn't generate the final
report. During testing, progress information will be written to the currently selected
output filehandle (usually "STDOUT"), or to the filehandle given by the "out" parameter.
The out is optional.

Returns a list of two values, $total and $failed, describing the results. $total is a
hash ref summary of all the tests run. Its keys and values are this:

bonus Number of individual todo tests unexpectedly passed
max Number of individual tests ran
ok Number of individual tests passed
sub_skipped Number of individual tests skipped
todo Number of individual todo tests

files Number of test files ran
good Number of test files passed
bad Number of test files failed
tests Number of test files originally given
skipped Number of test files skipped

If "$total->{bad} == 0" and "$total->{max} > 0", you've got a successful test.

$failed is a hash ref of all the test scripts that failed. Each key is the name of a test
script, each value is another hash representing how that script failed. Its keys are
these:

name Name of the test which failed
estat Script's exit value
wstat Script's wait status
max Number of individual tests
failed Number which failed
canon List of tests which failed (as string).

$failed should be empty if everything passed.

my($leader, $ml) = _mk_leader($test_file, $width);

Generates the 't/foo........' leader for the given $test_file as well as a similar version
which will overwrite the current line (by use of \r and such). $ml may be empty if
Test::Harness doesn't think you're on TTY.

The $width is the width of the "yada/blah.." string.

my($width) = _leader_width(@test_files);

Calculates how wide the leader should be based on the length of the longest test name.

EXPORT
&runtests is exported by Test::Harness by default.

&execute_tests, $verbose, $switches and $debug are exported upon request.

DIAGNOSTICS
"All tests successful.\nFiles=%d, Tests=%d, %s"
If all tests are successful some statistics about the performance are printed.

"FAILED tests %s\n\tFailed %d/%d tests, %.2f%% okay."
For any single script that has failing subtests statistics like the above are printed.

"Test returned status %d (wstat %d)"
Scripts that return a non-zero exit status, both "$? >> 8" and $? are printed in a
message similar to the above.

"Failed 1 test, %.2f%% okay. %s"
"Failed %d/%d tests, %.2f%% okay. %s"
If not all tests were successful, the script dies with one of the above messages.

"FAILED--Further testing stopped: %s"
If a single subtest decides that further testing will not make sense, the script dies
with this message.

ENVIRONMENT VARIABLES THAT TEST::HARNESS SETS
Test::Harness sets these before executing the individual tests.

"HARNESS_ACTIVE"
This is set to a true value. It allows the tests to determine if they are being
executed through the harness or by any other means.

"HARNESS_VERSION"
This is the version of Test::Harness.

ENVIRONMENT VARIABLES THAT AFFECT TEST::HARNESS
"HARNESS_COLUMNS"
This value will be used for the width of the terminal. If it is not set then it will
default to "COLUMNS". If this is not set, it will default to 80. Note that users of
Bourne-sh based shells will need to "export COLUMNS" for this module to use that
variable.

"HARNESS_COMPILE_TEST"
When true it will make harness attempt to compile the test using "perlcc" before
running it.

NOTE This currently only works when sitting in the perl source directory!

"HARNESS_DEBUG"
If true, Test::Harness will print debugging information about itself as it runs the
tests. This is different from "HARNESS_VERBOSE", which prints the output from the
test being run. Setting $Test::Harness::Debug will override this, or you can use the
"-d" switch in the prove utility.

"HARNESS_FILELEAK_IN_DIR"
When set to the name of a directory, harness will check after each test whether new
files appeared in that directory, and report them as

LEAKED FILES: scr.tmp 0 my.db

If relative, directory name is with respect to the current directory at the moment
runtests() was called. Putting absolute path into "HARNESS_FILELEAK_IN_DIR" may give
more predictable results.

"HARNESS_NOTTY"
When set to a true value, forces it to behave as though STDOUT were not a console.
You may need to set this if you don't want harness to output more frequent progress
messages using carriage returns. Some consoles may not handle carriage returns
properly (which results in a somewhat messy output).

"HARNESS_PERL"
Usually your tests will be run by $^X, the currently-executing Perl. However, you may
want to have it run by a different executable, such as a threading perl, or a
different version.

If you're using the prove utility, you can use the "--perl" switch.

"HARNESS_PERL_SWITCHES"
Its value will be prepended to the switches used to invoke perl on each test. For
example, setting "HARNESS_PERL_SWITCHES" to "-W" will run all tests with all warnings
enabled.

"HARNESS_TIMER"
Setting this to true will make the harness display the number of milliseconds each
test took. You can also use prove's "--timer" switch.

"HARNESS_VERBOSE"
If true, Test::Harness will output the verbose results of running its tests. Setting
$Test::Harness::verbose will override this, or you can use the "-v" switch in the
prove utility.

If true, Test::Harness will output the verbose results of running its tests. Setting
$Test::Harness::verbose will override this, or you can use the "-v" switch in the
prove utility.

"HARNESS_STRAP_CLASS"
Defines the Test::Harness::Straps subclass to use. The value may either be a filename
or a class name.

If HARNESS_STRAP_CLASS is a class name, the class must be in @INC like any other
class.

If HARNESS_STRAP_CLASS is a filename, the .pm file must return the name of the class,
instead of the canonical "1".

EXAMPLE
Here's how Test::Harness tests itself

$ cd ~/src/devel/Test-Harness
$ perl -Mblib -e 'use Test::Harness qw(&runtests $verbose);
$verbose=0; runtests @ARGV;' t/*.t
Using /home/schwern/src/devel/Test-Harness/blib
t/base..............ok
t/nonumbers.........ok
t/ok................ok
t/test-harness......ok
All tests successful.
Files=4, Tests=24, 2 wallclock secs ( 0.61 cusr + 0.41 csys = 1.02 CPU)

SEE ALSO
The included prove utility for running test scripts from the command line, Test and
Test::Simple for writing test scripts, Benchmark for the underlying timing routines, and
Devel::Cover for test coverage analysis.

TODO
Provide a way of running tests quietly (ie. no printing) for automated validation of
tests. This will probably take the form of a version of runtests() which rather than
printing its output returns raw data on the state of the tests. (Partially done in
Test::Harness::Straps)

Document the format.

Fix HARNESS_COMPILE_TEST without breaking its core usage.

Figure a way to report test names in the failure summary.

Rework the test summary so long test names are not truncated as badly. (Partially done
with new skip test styles)

Add option for coverage analysis.

Trap STDERR.

Implement Straps total_results()

Remember exit code

Completely redo the print summary code.

Straps->analyze_file() not taint clean, don't know if it can be

Fix that damned VMS nit.

Add a test for verbose.

Change internal list of test results to a hash.

Fix stats display when there's an overrun.

Fix so perls with spaces in the filename work.

Keeping whittling away at _run_all_tests()

Clean up how the summary is printed. Get rid of those damned formats.

BUGS
Please report any bugs or feature requests to "bug-test-harness at rt.cpan.org", or
through the web interface at
<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Test-Harness>. I will be notified, and
then you'll automatically be notified of progress on your bug as I make changes.

SUPPORT
You can find documentation for this module with the perldoc command.

perldoc Test::Harness

You can get docs for prove with

prove --man

You can also look for information at:

o AnnoCPAN: Annotated CPAN documentation

<http://annocpan.org/dist/Test-Harness>

o CPAN Ratings

<http://cpanratings.perl.org/d/Test-Harness>

o RT: CPAN's request tracker

<http://rt.cpan.org/NoAuth/Bugs.html?Dist=Test-Harness>

o Search CPAN

<http://search.cpan.org/dist/Test-Harness>

SOURCE CODE
The source code repository for Test::Harness is at
<http://svn.perl.org/modules/Test-Harness>.

AUTHORS
Either Tim Bunce or Andreas Koenig, we don't know. What we know for sure is, that it was
inspired by Larry Wall's TEST script that came with perl distributions for ages. Numerous
anonymous contributors exist. Andreas Koenig held the torch for many years, and then
Michael G Schwern.

Current maintainer is Andy Lester "<andy at petdance.com>".

This program is free software; you can redistribute it and/or modify it under the same
terms as Perl itself.

See <http://www.perl.com/perl/misc/Artistic.html>.

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