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Test::More(3) User Contributed Perl Documentation Test::More(3)
NAME
Test::More - yet another framework for writing test scripts
SYNOPSIS
use Test::More tests => 23;
# or
use Test::More skip_all => $reason;
# or
use Test::More; # see done_testing()
BEGIN { use_ok( 'Some::Module' ); }
require_ok( 'Some::Module' );
# Various ways to say "ok"
ok($got eq $expected, $test_name);
is ($got, $expected, $test_name);
isnt($got, $expected, $test_name);
# Rather than print STDERR "# here's what went wrong\n"
diag("here's what went wrong");
like ($got, qr/expected/, $test_name);
unlike($got, qr/expected/, $test_name);
cmp_ok($got, '==', $expected, $test_name);
is_deeply($got_complex_structure, $expected_complex_structure, $test_name);
SKIP: {
skip $why, $how_many unless $have_some_feature;
ok( foo(), $test_name );
is( foo(42), 23, $test_name );
};
TODO: {
local $TODO = $why;
ok( foo(), $test_name );
is( foo(42), 23, $test_name );
};
can_ok($module, @methods);
isa_ok($object, $class);
pass($test_name);
fail($test_name);
BAIL_OUT($why);
# UNIMPLEMENTED!!!
my @status = Test::More::status;
DESCRIPTION
STOP! If you're just getting started writing tests, have a look at Test::Simple first.
This is a drop in replacement for Test::Simple which you can switch to once you get the
hang of basic testing.
The purpose of this module is to provide a wide range of testing utilities. Various ways
to say "ok" with better diagnostics, facilities to skip tests, test future features and
compare complicated data structures. While you can do almost anything with a simple
"ok()" function, it doesn't provide good diagnostic output.
I love it when a plan comes together
Before anything else, you need a testing plan. This basically declares how many tests
your script is going to run to protect against premature failure.
The preferred way to do this is to declare a plan when you "use Test::More".
use Test::More tests => 23;
There are cases when you will not know beforehand how many tests your script is going to
run. In this case, you can declare your tests at the end.
use Test::More;
... run your tests ...
done_testing( $number_of_tests_run );
Sometimes you really don't know how many tests were run, or it's too difficult to
calculate. In which case you can leave off $number_of_tests_run.
In some cases, you'll want to completely skip an entire testing script.
use Test::More skip_all => $skip_reason;
Your script will declare a skip with the reason why you skipped and exit immediately with
a zero (success). See Test::Harness for details.
If you want to control what functions Test::More will export, you have to use the 'import'
option. For example, to import everything but 'fail', you'd do:
use Test::More tests => 23, import => ['!fail'];
Alternatively, you can use the plan() function. Useful for when you have to calculate the
number of tests.
use Test::More;
plan tests => keys %Stuff * 3;
or for deciding between running the tests at all:
use Test::More;
if( $^O eq 'MacOS' ) {
plan skip_all => 'Test irrelevant on MacOS';
}
else {
plan tests => 42;
}
done_testing
done_testing();
done_testing($number_of_tests);
If you don't know how many tests you're going to run, you can issue the plan when
you're done running tests.
$number_of_tests is the same as plan(), it's the number of tests you expected to run.
You can omit this, in which case the number of tests you ran doesn't matter, just the
fact that your tests ran to conclusion.
This is safer than and replaces the "no_plan" plan.
Test names
By convention, each test is assigned a number in order. This is largely done
automatically for you. However, it's often very useful to assign a name to each test.
Which would you rather see:
ok 4
not ok 5
ok 6
or
ok 4 - basic multi-variable
not ok 5 - simple exponential
ok 6 - force == mass * acceleration
The later gives you some idea of what failed. It also makes it easier to find the test in
your script, simply search for "simple exponential".
All test functions take a name argument. It's optional, but highly suggested that you use
it.
I'm ok, you're not ok.
The basic purpose of this module is to print out either "ok #" or "not ok #" depending on
if a given test succeeded or failed. Everything else is just gravy.
All of the following print "ok" or "not ok" depending on if the test succeeded or failed.
They all also return true or false, respectively.
ok
ok($got eq $expected, $test_name);
This simply evaluates any expression ("$got eq $expected" is just a simple example)
and uses that to determine if the test succeeded or failed. A true expression passes,
a false one fails. Very simple.
For example:
ok( $exp{9} == 81, 'simple exponential' );
ok( Film->can('db_Main'), 'set_db()' );
ok( $p->tests == 4, 'saw tests' );
ok( !grep !defined $_, @items, 'items populated' );
(Mnemonic: "This is ok.")
$test_name is a very short description of the test that will be printed out. It makes
it very easy to find a test in your script when it fails and gives others an idea of
your intentions. $test_name is optional, but we very strongly encourage its use.
Should an ok() fail, it will produce some diagnostics:
not ok 18 - sufficient mucus
# Failed test 'sufficient mucus'
# in foo.t at line 42.
This is the same as Test::Simple's ok() routine.
is
isnt
is ( $got, $expected, $test_name );
isnt( $got, $expected, $test_name );
Similar to ok(), is() and isnt() compare their two arguments with "eq" and "ne"
respectively and use the result of that to determine if the test succeeded or failed.
So these:
# Is the ultimate answer 42?
is( ultimate_answer(), 42, "Meaning of Life" );
# $foo isn't empty
isnt( $foo, '', "Got some foo" );
are similar to these:
ok( ultimate_answer() eq 42, "Meaning of Life" );
ok( $foo ne '', "Got some foo" );
"undef" will only ever match "undef". So you can test a value agains "undef" like
this:
is($not_defined, undef, "undefined as expected");
(Mnemonic: "This is that." "This isn't that.")
So why use these? They produce better diagnostics on failure. ok() cannot know what
you are testing for (beyond the name), but is() and isnt() know what the test was and
why it failed. For example this test:
my $foo = 'waffle'; my $bar = 'yarblokos';
is( $foo, $bar, 'Is foo the same as bar?' );
Will produce something like this:
not ok 17 - Is foo the same as bar?
# Failed test 'Is foo the same as bar?'
# in foo.t at line 139.
# got: 'waffle'
# expected: 'yarblokos'
So you can figure out what went wrong without rerunning the test.
You are encouraged to use is() and isnt() over ok() where possible, however do not be
tempted to use them to find out if something is true or false!
# XXX BAD!
is( exists $brooklyn{tree}, 1, 'A tree grows in Brooklyn' );
This does not check if "exists $brooklyn{tree}" is true, it checks if it returns 1.
Very different. Similar caveats exist for false and 0. In these cases, use ok().
ok( exists $brooklyn{tree}, 'A tree grows in Brooklyn' );
A simple call to isnt() usually does not provide a strong test but there are cases
when you cannot say much more about a value than that it is different from some other
value:
new_ok $obj, "Foo";
my $clone = $obj->clone;
isa_ok $obj, "Foo", "Foo->clone";
isnt $obj, $clone, "clone() produces a different object";
For those grammatical pedants out there, there's an "isn't()" function which is an
alias of isnt().
like
like( $got, qr/expected/, $test_name );
Similar to ok(), like() matches $got against the regex "qr/expected/".
So this:
like($got, qr/expected/, 'this is like that');
is similar to:
ok( $got =~ /expected/, 'this is like that');
(Mnemonic "This is like that".)
The second argument is a regular expression. It may be given as a regex reference
(i.e. "qr//") or (for better compatibility with older perls) as a string that looks
like a regex (alternative delimiters are currently not supported):
like( $got, '/expected/', 'this is like that' );
Regex options may be placed on the end ('/expected/i').
Its advantages over ok() are similar to that of is() and isnt(). Better diagnostics
on failure.
unlike
unlike( $got, qr/expected/, $test_name );
Works exactly as like(), only it checks if $got does not match the given pattern.
cmp_ok
cmp_ok( $got, $op, $expected, $test_name );
Halfway between ok() and is() lies cmp_ok(). This allows you to compare two arguments
using any binary perl operator.
# ok( $got eq $expected );
cmp_ok( $got, 'eq', $expected, 'this eq that' );
# ok( $got == $expected );
cmp_ok( $got, '==', $expected, 'this == that' );
# ok( $got && $expected );
cmp_ok( $got, '&&', $expected, 'this && that' );
...etc...
Its advantage over ok() is when the test fails you'll know what $got and $expected
were:
not ok 1
# Failed test in foo.t at line 12.
# '23'
# &&
# undef
It's also useful in those cases where you are comparing numbers and is()'s use of "eq"
will interfere:
cmp_ok( $big_hairy_number, '==', $another_big_hairy_number );
It's especially useful when comparing greater-than or smaller-than relation between
values:
cmp_ok( $some_value, '<=', $upper_limit );
can_ok
can_ok($module, @methods);
can_ok($object, @methods);
Checks to make sure the $module or $object can do these @methods (works with
functions, too).
can_ok('Foo', qw(this that whatever));
is almost exactly like saying:
ok( Foo->can('this') &&
Foo->can('that') &&
Foo->can('whatever')
);
only without all the typing and with a better interface. Handy for quickly testing an
interface.
No matter how many @methods you check, a single can_ok() call counts as one test. If
you desire otherwise, use:
foreach my $meth (@methods) {
can_ok('Foo', $meth);
}
isa_ok
isa_ok($object, $class, $object_name);
isa_ok($subclass, $class, $object_name);
isa_ok($ref, $type, $ref_name);
Checks to see if the given "$object->isa($class)". Also checks to make sure the
object was defined in the first place. Handy for this sort of thing:
my $obj = Some::Module->new;
isa_ok( $obj, 'Some::Module' );
where you'd otherwise have to write
my $obj = Some::Module->new;
ok( defined $obj && $obj->isa('Some::Module') );
to safeguard against your test script blowing up.
You can also test a class, to make sure that it has the right ancestor:
isa_ok( 'Vole', 'Rodent' );
It works on references, too:
isa_ok( $array_ref, 'ARRAY' );
The diagnostics of this test normally just refer to 'the object'. If you'd like them
to be more specific, you can supply an $object_name (for example 'Test customer').
new_ok
my $obj = new_ok( $class );
my $obj = new_ok( $class => \@args );
my $obj = new_ok( $class => \@args, $object_name );
A convenience function which combines creating an object and calling isa_ok() on that
object.
It is basically equivalent to:
my $obj = $class->new(@args);
isa_ok $obj, $class, $object_name;
If @args is not given, an empty list will be used.
This function only works on new() and it assumes new() will return just a single
object which isa $class.
subtest
subtest $name => \&code;
subtest() runs the &code as its own little test with its own plan and its own result.
The main test counts this as a single test using the result of the whole subtest to
determine if its ok or not ok.
For example...
use Test::More tests => 3;
pass("First test");
subtest 'An example subtest' => sub {
plan tests => 2;
pass("This is a subtest");
pass("So is this");
};
pass("Third test");
This would produce.
1..3
ok 1 - First test
1..2
ok 1 - This is a subtest
ok 2 - So is this
ok 2 - An example subtest
ok 3 - Third test
A subtest may call "skip_all". No tests will be run, but the subtest is considered a
skip.
subtest 'skippy' => sub {
plan skip_all => 'cuz I said so';
pass('this test will never be run');
};
Returns true if the subtest passed, false otherwise.
Due to how subtests work, you may omit a plan if you desire. This adds an implicit
"done_testing()" to the end of your subtest. The following two subtests are
equivalent:
subtest 'subtest with implicit done_testing()', sub {
ok 1, 'subtests with an implicit done testing should work';
ok 1, '... and support more than one test';
ok 1, '... no matter how many tests are run';
};
subtest 'subtest with explicit done_testing()', sub {
ok 1, 'subtests with an explicit done testing should work';
ok 1, '... and support more than one test';
ok 1, '... no matter how many tests are run';
done_testing();
};
pass
fail
pass($test_name);
fail($test_name);
Sometimes you just want to say that the tests have passed. Usually the case is you've
got some complicated condition that is difficult to wedge into an ok(). In this case,
you can simply use pass() (to declare the test ok) or fail (for not ok). They are
synonyms for ok(1) and ok(0).
Use these very, very, very sparingly.
Module tests
You usually want to test if the module you're testing loads ok, rather than just vomiting
if its load fails. For such purposes we have "use_ok" and "require_ok".
use_ok
BEGIN { use_ok($module); }
BEGIN { use_ok($module, @imports); }
These simply use the given $module and test to make sure the load happened ok. It's
recommended that you run use_ok() inside a BEGIN block so its functions are exported
at compile-time and prototypes are properly honored.
If @imports are given, they are passed through to the use. So this:
BEGIN { use_ok('Some::Module', qw(foo bar)) }
is like doing this:
use Some::Module qw(foo bar);
Version numbers can be checked like so:
# Just like "use Some::Module 1.02"
BEGIN { use_ok('Some::Module', 1.02) }
Don't try to do this:
BEGIN {
use_ok('Some::Module');
...some code that depends on the use...
...happening at compile time...
}
because the notion of "compile-time" is relative. Instead, you want:
BEGIN { use_ok('Some::Module') }
BEGIN { ...some code that depends on the use... }
If you want the equivalent of "use Foo ()", use a module but not import anything, use
"require_ok".
BEGIN { require_ok "Foo" }
require_ok
require_ok($module);
require_ok($file);
Like use_ok(), except it requires the $module or $file.
Complex data structures
Not everything is a simple eq check or regex. There are times you need to see if two data
structures are equivalent. For these instances Test::More provides a handful of useful
functions.
NOTE I'm not quite sure what will happen with filehandles.
is_deeply
is_deeply( $got, $expected, $test_name );
Similar to is(), except that if $got and $expected are references, it does a deep
comparison walking each data structure to see if they are equivalent. If the two
structures are different, it will display the place where they start differing.
is_deeply() compares the dereferenced values of references, the references themselves
(except for their type) are ignored. This means aspects such as blessing and ties are
not considered "different".
is_deeply() currently has very limited handling of function reference and globs. It
merely checks if they have the same referent. This may improve in the future.
Test::Differences and Test::Deep provide more in-depth functionality along these
lines.
Diagnostics
If you pick the right test function, you'll usually get a good idea of what went wrong
when it failed. But sometimes it doesn't work out that way. So here we have ways for you
to write your own diagnostic messages which are safer than just "print STDERR".
diag
diag(@diagnostic_message);
Prints a diagnostic message which is guaranteed not to interfere with test output.
Like "print" @diagnostic_message is simply concatenated together.
Returns false, so as to preserve failure.
Handy for this sort of thing:
ok( grep(/foo/, @users), "There's a foo user" ) or
diag("Since there's no foo, check that /etc/bar is set up right");
which would produce:
not ok 42 - There's a foo user
# Failed test 'There's a foo user'
# in foo.t at line 52.
# Since there's no foo, check that /etc/bar is set up right.
You might remember "ok() or diag()" with the mnemonic "open() or die()".
NOTE The exact formatting of the diagnostic output is still changing, but it is
guaranteed that whatever you throw at it it won't interfere with the test.
note
note(@diagnostic_message);
Like diag(), except the message will not be seen when the test is run in a harness.
It will only be visible in the verbose TAP stream.
Handy for putting in notes which might be useful for debugging, but don't indicate a
problem.
note("Tempfile is $tempfile");
explain
my @dump = explain @diagnostic_message;
Will dump the contents of any references in a human readable format. Usually you want
to pass this into "note" or "diag".
Handy for things like...
is_deeply($have, $want) || diag explain $have;
or
note explain \%args;
Some::Class->method(%args);
Conditional tests
Sometimes running a test under certain conditions will cause the test script to die. A
certain function or method isn't implemented (such as fork() on MacOS), some resource
isn't available (like a net connection) or a module isn't available. In these cases it's
necessary to skip tests, or declare that they are supposed to fail but will work in the
future (a todo test).
For more details on the mechanics of skip and todo tests see Test::Harness.
The way Test::More handles this is with a named block. Basically, a block of tests which
can be skipped over or made todo. It's best if I just show you...
SKIP: BLOCK
SKIP: {
skip $why, $how_many if $condition;
...normal testing code goes here...
}
This declares a block of tests that might be skipped, $how_many tests there are, $why
and under what $condition to skip them. An example is the easiest way to illustrate:
SKIP: {
eval { require HTML::Lint };
skip "HTML::Lint not installed", 2 if $@;
my $lint = new HTML::Lint;
isa_ok( $lint, "HTML::Lint" );
$lint->parse( $html );
is( $lint->errors, 0, "No errors found in HTML" );
}
If the user does not have HTML::Lint installed, the whole block of code won't be run
at all. Test::More will output special ok's which Test::Harness interprets as
skipped, but passing, tests.
It's important that $how_many accurately reflects the number of tests in the SKIP
block so the # of tests run will match up with your plan. If your plan is "no_plan"
$how_many is optional and will default to 1.
It's perfectly safe to nest SKIP blocks. Each SKIP block must have the label "SKIP",
or Test::More can't work its magic.
You don't skip tests which are failing because there's a bug in your program, or for
which you don't yet have code written. For that you use TODO. Read on.
TODO: BLOCK
TODO: {
local $TODO = $why if $condition;
...normal testing code goes here...
}
Declares a block of tests you expect to fail and $why. Perhaps it's because you
haven't fixed a bug or haven't finished a new feature:
TODO: {
local $TODO = "URI::Geller not finished";
my $card = "Eight of clubs";
is( URI::Geller->your_card, $card, 'Is THIS your card?' );
my $spoon;
URI::Geller->bend_spoon;
is( $spoon, 'bent', "Spoon bending, that's original" );
}
With a todo block, the tests inside are expected to fail. Test::More will run the
tests normally, but print out special flags indicating they are "todo". Test::Harness
will interpret failures as being ok. Should anything succeed, it will report it as an
unexpected success. You then know the thing you had todo is done and can remove the
TODO flag.
The nice part about todo tests, as opposed to simply commenting out a block of tests,
is it's like having a programmatic todo list. You know how much work is left to be
done, you're aware of what bugs there are, and you'll know immediately when they're
fixed.
Once a todo test starts succeeding, simply move it outside the block. When the block
is empty, delete it.
todo_skip
TODO: {
todo_skip $why, $how_many if $condition;
...normal testing code...
}
With todo tests, it's best to have the tests actually run. That way you'll know when
they start passing. Sometimes this isn't possible. Often a failing test will cause
the whole program to die or hang, even inside an "eval BLOCK" with and using "alarm".
In these extreme cases you have no choice but to skip over the broken tests entirely.
The syntax and behavior is similar to a "SKIP: BLOCK" except the tests will be marked
as failing but todo. Test::Harness will interpret them as passing.
When do I use SKIP vs. TODO?
If it's something the user might not be able to do, use SKIP. This includes optional
modules that aren't installed, running under an OS that doesn't have some feature
(like fork() or symlinks), or maybe you need an Internet connection and one isn't
available.
If it's something the programmer hasn't done yet, use TODO. This is for any code you
haven't written yet, or bugs you have yet to fix, but want to put tests in your
testing script (always a good idea).
Test control
BAIL_OUT
BAIL_OUT($reason);
Indicates to the harness that things are going so badly all testing should terminate.
This includes the running of any additional test scripts.
This is typically used when testing cannot continue such as a critical module failing
to compile or a necessary external utility not being available such as a database
connection failing.
The test will exit with 255.
For even better control look at Test::Most.
Discouraged comparison functions
The use of the following functions is discouraged as they are not actually testing
functions and produce no diagnostics to help figure out what went wrong. They were
written before is_deeply() existed because I couldn't figure out how to display a useful
diff of two arbitrary data structures.
These functions are usually used inside an ok().
ok( eq_array(\@got, \@expected) );
"is_deeply()" can do that better and with diagnostics.
is_deeply( \@got, \@expected );
They may be deprecated in future versions.
eq_array
my $is_eq = eq_array(\@got, \@expected);
Checks if two arrays are equivalent. This is a deep check, so multi-level structures
are handled correctly.
eq_hash
my $is_eq = eq_hash(\%got, \%expected);
Determines if the two hashes contain the same keys and values. This is a deep check.
eq_set
my $is_eq = eq_set(\@got, \@expected);
Similar to eq_array(), except the order of the elements is not important. This is a
deep check, but the irrelevancy of order only applies to the top level.
ok( eq_set(\@got, \@expected) );
Is better written:
is_deeply( [sort @got], [sort @expected] );
NOTE By historical accident, this is not a true set comparison. While the order of
elements does not matter, duplicate elements do.
NOTE eq_set() does not know how to deal with references at the top level. The
following is an example of a comparison which might not work:
eq_set([\1, \2], [\2, \1]);
Test::Deep contains much better set comparison functions.
Extending and Embedding Test::More
Sometimes the Test::More interface isn't quite enough. Fortunately, Test::More is built
on top of Test::Builder which provides a single, unified backend for any test library to
use. This means two test libraries which both use Test::Builder can be used together in
the same program.
If you simply want to do a little tweaking of how the tests behave, you can access the
underlying Test::Builder object like so:
builder
my $test_builder = Test::More->builder;
Returns the Test::Builder object underlying Test::More for you to play with.
EXIT CODES
If all your tests passed, Test::Builder will exit with zero (which is normal). If
anything failed it will exit with how many failed. If you run less (or more) tests than
you planned, the missing (or extras) will be considered failures. If no tests were ever
run Test::Builder will throw a warning and exit with 255. If the test died, even after
having successfully completed all its tests, it will still be considered a failure and
will exit with 255.
So the exit codes are...
0 all tests successful
255 test died or all passed but wrong # of tests run
any other number how many failed (including missing or extras)
If you fail more than 254 tests, it will be reported as 254.
NOTE This behavior may go away in future versions.
CAVEATS and NOTES
Backwards compatibility
Test::More works with Perls as old as 5.6.0.
utf8 / "Wide character in print"
If you use utf8 or other non-ASCII characters with Test::More you might get a "Wide
character in print" warning. Using "binmode STDOUT, ":utf8"" will not fix it.
Test::Builder (which powers Test::More) duplicates STDOUT and STDERR. So any changes
to them, including changing their output disciplines, will not be seem by Test::More.
The work around is to change the filehandles used by Test::Builder directly.
my $builder = Test::More->builder;
binmode $builder->output, ":utf8";
binmode $builder->failure_output, ":utf8";
binmode $builder->todo_output, ":utf8";
Overloaded objects
String overloaded objects are compared as strings (or in cmp_ok()'s case, strings or
numbers as appropriate to the comparison op). This prevents Test::More from piercing
an object's interface allowing better blackbox testing. So if a function starts
returning overloaded objects instead of bare strings your tests won't notice the
difference. This is good.
However, it does mean that functions like is_deeply() cannot be used to test the
internals of string overloaded objects. In this case I would suggest Test::Deep which
contains more flexible testing functions for complex data structures.
Threads
Test::More will only be aware of threads if "use threads" has been done before
Test::More is loaded. This is ok:
use threads;
use Test::More;
This may cause problems:
use Test::More
use threads;
5.8.1 and above are supported. Anything below that has too many bugs.
HISTORY
This is a case of convergent evolution with Joshua Pritikin's Test module. I was largely
unaware of its existence when I'd first written my own ok() routines. This module exists
because I can't figure out how to easily wedge test names into Test's interface (along
with a few other problems).
The goal here is to have a testing utility that's simple to learn, quick to use and
difficult to trip yourself up with while still providing more flexibility than the
existing Test.pm. As such, the names of the most common routines are kept tiny, special
cases and magic side-effects are kept to a minimum. WYSIWYG.
SEE ALSO
Test::Simple if all this confuses you and you just want to write some tests. You can
upgrade to Test::More later (it's forward compatible).
Test::Harness is the test runner and output interpreter for Perl. It's the thing that
powers "make test" and where the "prove" utility comes from.
Test::Legacy tests written with Test.pm, the original testing module, do not play well
with other testing libraries. Test::Legacy emulates the Test.pm interface and does play
well with others.
Test::Differences for more ways to test complex data structures. And it plays well with
Test::More.
Test::Class is like xUnit but more perlish.
Test::Deep gives you more powerful complex data structure testing.
Test::Inline shows the idea of embedded testing.
Bundle::Test installs a whole bunch of useful test modules.
AUTHORS
Michael G Schwern <schwern AT pobox.com> with much inspiration from Joshua Pritikin's Test
module and lots of help from Barrie Slaymaker, Tony Bowden, blackstar.co.uk, chromatic,
Fergal Daly and the perl-qa gang.
BUGS
See http://rt.cpan.org to report and view bugs.
SOURCE
The source code repository for Test::More can be found at
http://github.com/schwern/test-more/.
COPYRIGHT
Copyright 2001-2008 by Michael G Schwern <schwern AT pobox.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
perl v5.16.3 2011-02-23 Test::More(3)
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