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Test::More - yet another framework for writing test scripts
use Test::More tests => $Num_Tests; # or use Test::More qw(no_plan); # or use Test::More skip_all => $reason;
BEGIN { use_ok( 'Some::Module' ); }
require_ok( 'Some::Module' );
# Various ways to say "ok" ok($this eq $that, $test_name);
is ($this, $that, $test_name); isnt($this, $that, $test_name);
# Rather than print STDERR "# here's what went wrong\n"
diag("here's what went wrong");
like ($this, qr/that/, $test_name); unlike($this, qr/that/, $test_name);
cmp_ok($this, '==', $that, $test_name);
is_deeply($complex_structure1, $complex_structure2, $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;
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.
The preferred way to do this is to declare a plan when you "use Test::More".
use Test::More tests => $Num_Tests;
There are rare cases when you will not know beforehand how many tests your script is going to run. In this case, you can declare that you have no plan. (Try to avoid using this as it weakens your test.)
use Test::More qw(no_plan);
NOTE: using no_plan requires a Test::Harness upgrade else it will think everything has failed. See ``CAVEATS and NOTES'').
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( $^O eq 'MacOS' ) {
plan skip_all => 'Test irrelevant on MacOS';
}
else {
plan tests => 42;
}
ok 4 not ok 5 ok 6
or
ok 4 - basic multi-variable not ok 5 - simple exponential ok 6 - force == mass * acceleration
The later gives you some idea of what failed. It also makes it easier to find the test in your script, simply search for ``simple exponential''.
All test functions take a name argument. It's optional, but highly suggested that you use it.
All of the following print ``ok'' or ``not ok'' depending on if the test succeeded or failed. They all also return true or false, respectively.
ok($this eq $that, $test_name);
This simply evaluates any expression ("$this eq $that" 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 actually Test::Simple's ok() routine.
is ( $this, $that, $test_name ); isnt( $this, $that, $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" );
(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' );
For those grammatical pedants out there, there's an "isn't()" function which is an alias of isnt().
like( $this, qr/that/, $test_name );
Similar to ok(), like() matches $this against the regex "qr/that/".
So this:
like($this, qr/that/, 'this is like that');
is similar to:
ok( $this =~ /that/, '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( $this, '/that/', 'this is like that' );
Regex options may be placed on the end ('/that/i').
Its advantages over ok() are similar to that of is() and isnt(). Better diagnostics on failure.
unlike( $this, qr/that/, $test_name );
Works exactly as like(), only it checks if $this does not match the given pattern.
cmp_ok( $this, $op, $that, $test_name );
Halfway between ok() and is() lies cmp_ok(). This allows you to compare two arguments using any binary perl operator.
# ok( $this eq $that );
cmp_ok( $this, 'eq', $that, 'this eq that' );
# ok( $this == $that );
cmp_ok( $this, '==', $that, 'this == that' );
# ok( $this && $that );
cmp_ok( $this, '&&', $that, 'this && that' );
...etc...
Its advantage over ok() is when the test fails you'll know what $this and $that 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, '==', $another_big_hairy_number );
can_ok($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', $meth);
}
isa_ok($object, $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.
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 $object_name (for example 'Test customer').
pass($test_name); fail($test_name);
Sometimes you just want to say that the tests have passed. Usually the case is you've got some complicated condition that is difficult to wedge into an ok(). In this case, you can simply use pass() (to declare the test ok) or fail (for not ok). They are synonyms for ok(1) and ok(0).
Use these very, very, very sparingly.
BEGIN { use_ok($module); }
BEGIN { use_ok($module, @imports); }
These simply use the given $module and test to make sure the load happened ok. It's recommended that you run use_ok() inside a BEGIN block so its functions are exported at compile-time and prototypes are properly honored.
If @imports are given, they are passed through to the use. So this:
BEGIN { use_ok('Some::Module', qw(foo bar)) }
is like doing this:
use Some::Module qw(foo bar);
Version numbers can be checked like so:
# Just like "use Some::Module 1.02"
BEGIN { use_ok('Some::Module', 1.02) }
Don't try to do this:
BEGIN {
use_ok('Some::Module');
...some code that depends on the use...
...happening at compile time...
}
because the notion of ``compile-time'' is relative. Instead, you want:
BEGIN { use_ok('Some::Module') }
BEGIN { ...some code that depends on the use... }
require_ok($module); require_ok($file);
Like use_ok(), except it requires the $module or $file.
NOTE I'm not quite sure what will happen with filehandles.
is_deeply( $this, $that, $test_name );
Similar to is(), except that if $this and $that 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() current 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.
diag(@diagnostic_message);
Prints a diagnostic message which is guaranteed not to interfere with test output. Like "print" @diagnostic_message is simply concatenated together.
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.
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: {
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: {
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.
NOTE: TODO tests require a Test::Harness upgrade else it will treat it as a normal failure. See ``CAVEATS and NOTES'').
TODO: {
todo_skip $why, $how_many if $condition;
...normal testing code...
}
With todo tests, it's best to have the tests actually run. That way you'll know when they start passing. Sometimes this isn't possible. Often a failing test will cause the whole program to die or hang, even inside an "eval BLOCK" with and using "alarm". In these extreme cases you have no choice but to skip over the broken tests entirely.
The syntax and behavior is similar to a "SKIP: BLOCK" except the tests will be marked as failing but todo. Test::Harness will interpret them as passing.
If it's something the programmer hasn't done yet, use TODO. This is for any code you haven't written yet, or bugs you have yet to fix, but want to put tests in your testing script (always a good idea).
BAIL_OUT($reason);
Incidates to the harness that things are going so badly all testing should terminate. This includes the running 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.
These functions are usually used inside an ok().
ok( eq_array(\@this, \@that) );
"is_deeply()" can do that better and with diagnostics.
is_deeply( \@this, \@that );
They may be deprecated in future versions.
my $is_eq = eq_array(\@this, \@that);
Checks if two arrays are equivalent. This is a deep check, so multi-level structures are handled correctly.
my $is_eq = eq_hash(\%this, \%that);
Determines if the two hashes contain the same keys and values. This is a deep check.
my $is_eq = eq_set(\@this, \@that);
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(\@this, \@that) );
Is better written:
is_deeply( [sort @this], [sort @that] );
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.
If you simply want to do a little tweaking of how the tests behave, you can access the underlying Test::Builder object like so:
my $test_builder = Test::More->builder;
Returns the Test::Builder object underlying Test::More for you to play with.
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.
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.
use threads;
use Test::More;
This may cause problems:
use Test::More
use threads;
Installing Test::More should also upgrade Test::Harness.
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.
Test is the old testing module. Its main benefit is that it has been distributed with Perl since 5.004_05.
Test::Harness for details on how your test results are interpreted by Perl.
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::Unit is XUnit style testing.
Test::Inline shows the idea of embedded testing.
Bundle::Test installs a whole bunch of useful test modules.
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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