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Test::Builder::Tester(3) User Contributed Perl Documentation Test::Builder::Tester(3)
NAME
Test::Builder::Tester - test testsuites that have been built with Test::Builder
SYNOPSIS
use Test::Builder::Tester tests => 1;
use Test::More;
test_out("not ok 1 - foo");
test_fail(+1);
fail("foo");
test_test("fail works");
DESCRIPTION
A module that helps you test testing modules that are built with Test::Builder.
The testing system is designed to be used by performing a three step process for each test
you wish to test. This process starts with using "test_out" and "test_err" in advance to
declare what the testsuite you are testing will output with Test::Builder to stdout and
stderr.
You then can run the test(s) from your test suite that call Test::Builder. At this point
the output of Test::Builder is safely captured by Test::Builder::Tester rather than being
interpreted as real test output.
The final stage is to call "test_test" that will simply compare what you predeclared to
what Test::Builder actually outputted, and report the results back with a "ok" or "not ok"
(with debugging) to the normal output.
Functions
These are the six methods that are exported as default.
test_out
test_err
Procedures for predeclaring the output that your test suite is expected to produce
until "test_test" is called. These procedures automatically assume that each line
terminates with "\n". So
test_out("ok 1","ok 2");
is the same as
test_out("ok 1\nok 2");
which is even the same as
test_out("ok 1");
test_out("ok 2");
Once "test_out" or "test_err" (or "test_fail" or "test_diag") have been called, all
further output from Test::Builder will be captured by Test::Builder::Tester. This
means that you will not be able perform further tests to the normal output in the
normal way until you call "test_test" (well, unless you manually meddle with the
output filehandles)
test_fail
Because the standard failure message that Test::Builder produces whenever a test fails
will be a common occurrence in your test error output, and because it has changed
between Test::Builder versions, rather than forcing you to call "test_err" with the
string all the time like so
test_err("# Failed test ($0 at line ".line_num(+1).")");
"test_fail" exists as a convenience function that can be called instead. It takes one
argument, the offset from the current line that the line that causes the fail is on.
test_fail(+1);
This means that the example in the synopsis could be rewritten more simply as:
test_out("not ok 1 - foo");
test_fail(+1);
fail("foo");
test_test("fail works");
test_diag
As most of the remaining expected output to the error stream will be created by
Test::Builder's "diag" function, Test::Builder::Tester provides a convenience function
"test_diag" that you can use instead of "test_err".
The "test_diag" function prepends comment hashes and spacing to the start and newlines
to the end of the expected output passed to it and adds it to the list of expected
error output. So, instead of writing
test_err("# Couldn't open file");
you can write
test_diag("Couldn't open file");
Remember that Test::Builder's diag function will not add newlines to the end of output
and test_diag will. So to check
Test::Builder->new->diag("foo\n","bar\n");
You would do
test_diag("foo","bar")
without the newlines.
test_test
Actually performs the output check testing the tests, comparing the data (with "eq")
that we have captured from Test::Builder against that that was declared with
"test_out" and "test_err".
This takes name/value pairs that effect how the test is run.
title (synonym 'name', 'label')
The name of the test that will be displayed after the "ok" or "not ok".
skip_out
Setting this to a true value will cause the test to ignore if the output sent by
the test to the output stream does not match that declared with "test_out".
skip_err
Setting this to a true value will cause the test to ignore if the output sent by
the test to the error stream does not match that declared with "test_err".
As a convenience, if only one argument is passed then this argument is assumed to be
the name of the test (as in the above examples.)
Once "test_test" has been run test output will be redirected back to the original
filehandles that Test::Builder was connected to (probably STDOUT and STDERR,) meaning
any further tests you run will function normally and cause success/errors for
Test::Harness.
line_num
A utility function that returns the line number that the function was called on. You
can pass it an offset which will be added to the result. This is very useful for
working out the correct text of diagnostic functions that contain line numbers.
Essentially this is the same as the "__LINE__" macro, but the "line_num(+3)" idiom is
arguably nicer.
In addition to the six exported functions there exists one function that can only be
accessed with a fully qualified function call.
color
When "test_test" is called and the output that your tests generate does not match that
which you declared, "test_test" will print out debug information showing the two
conflicting versions. As this output itself is debug information it can be confusing
which part of the output is from "test_test" and which was the original output from
your original tests. Also, it may be hard to spot things like extraneous whitespace
at the end of lines that may cause your test to fail even though the output looks
similar.
To assist you "test_test" can colour the background of the debug information to
disambiguate the different types of output. The debug output will have its background
coloured green and red. The green part represents the text which is the same between
the executed and actual output, the red shows which part differs.
The "color" function determines if colouring should occur or not. Passing it a true
or false value will enable or disable colouring respectively, and the function called
with no argument will return the current setting.
To enable colouring from the command line, you can use the
Text::Builder::Tester::Color module like so:
perl -Mlib=Text::Builder::Tester::Color test.t
Or by including the Test::Builder::Tester::Color module directly in the PERL5LIB.
BUGS
Calls "<Test::Builder-"no_ending>> turning off the ending tests. This is needed as
otherwise it will trip out because we've run more tests than we strictly should have and
it'll register any failures we had that we were testing for as real failures.
The color function doesn't work unless Term::ANSIColor is compatible with your terminal.
Bugs (and requests for new features) can be reported to the author though the CPAN RT
system: <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Test-Builder-Tester>
AUTHOR
Copyright Mark Fowler <mark AT twoshortplanks.com> 2002, 2004.
Some code taken from Test::More and Test::Catch, written by by Michael G Schwern
<schwern AT pobox.com>. Hence, those parts Copyright Micheal G Schwern 2001. Used and
distributed with permission.
This program is free software; you can redistribute it and/or modify it under the same
terms as Perl itself.
NOTES
Thanks to Richard Clamp <richardc AT unixbeard.net> for letting me use his testing system to
try this module out on.
SEE ALSO
Test::Builder, Test::Builder::Tester::Color, Test::More.
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