Brad Haywood > Test-Lite > Test::Lite

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NAME ^

Test::Lite - A small Perl Test Library

DESCRIPTION ^

Test::Lite is just that. A minimal test library based on the brilliant Test::Builder. The main focus of this project was to learn more about testing while building this module. A pretty overlooked subject amongst some Perl developers is testing (myself included). I've tried to offer some different features in this module, but you're probably still better off with Test::More, Test::Most or one of the many other testing libraries out there.

SYNOPSIS ^

Using Test::Lite is pretty similar to other test modules (Why break tradition, eh?)

    use Test::Lite;

    my $a = { name => 'World' };
    my $b = { name => 'Worlds' };
    
    diff ($a, $b, "Difference between hash 'a' and hash 'b'");

    my @non_ref qw(not a ref);
    my $true_ref = [1, 2, 3];
    is_ref(@non_ref, 'Name of test');
    is_ref($true_ref => 'HASH', 'Name of test'); # Checks to see if $true_ref returns a HASH

    use_ok [qw( A::Module Another::Module )];

TESTS ^

is

    is ( $a, $b, {}, 'Name of test');

Does $a equal $b? This particular test can match integers or strings. Third parameter takes a hashref. Using this hashref you can make the test a little more 'strict' by setting a type to check for.

    my $a = 1;
    my $b = 'one';
    
    is ($a, $b, { type => 'Int' });

The above will fail because it expects an integer, but $b is a string.

ok

    my $test = "World";
    my $pass = 0;

    ok ( $test, $name ); # passes
    ok ( $pass ); # fails

Checks that the first parameter returns true. If not, it will fail.

cmp_ok

Evaluates the parameters using the operator specified as the second parameter.

    cmp_ok ( 'this', 'eq', 'that', 'Test Name' );
    cmp_ok ( 1, '==', 2, 'Test Name' );

like

    like( 'Hello, World!', qr/Hello/, 'Test Name');

Searches the first parameter for the regex specified in the second. If it's found it will pass the test.

unlike

Similar to like, but the opposite.

diff

Checks the values of two references (HashRef or ArrayRef). If any are different the test will fail and you'll be able to see the output of what diff was expecting, and what it actually got

    my $a = { foo => 'bar' };
    my $b = { baz => 'foo' };
    
    diff $a, $b, 'Test name'; # fail

    my $ary = [1, 2, 3];
    my $ary2 = [1, 2, 3];
    
    diff $ary, $ary2, 'Test name'; # pass

can_ok

Finds out whether the specified module can call on certain methods.

    can_ok 'Foo' => qw/ this that them who what /;

isa_ok

Tests to see if the specified object returns the right class

    my $ob = Foo->new;
    isa_ok $ob, 'Foo', 'Test Name';

diag

Pretty much the same as other Test libraries. Returns output that won't interrupt your tests.

    diag 'Boo!';

methods

Returns a string listing all the methods callable by a module.

    can_ok( Foo => ['test'] ) or diag methods('Foo');

explain

Returns a dump of an object (like a hash/arrayref).

    my $hash = {
        a => 1,
        b => 'foo',
        c => 'baz'
    };
    diag explain $hash;

Will return

    # {
    #   'a' => 1,
    #   'b' => 'foo',
    #   'c' => 'baz'
    # }

use_ok

Attempts to use the module given, or multiple modules if an arrayref is provided

    use_ok 'Foo';
    use_ok [qw( Foo Foo::Bar Baz )];

todo_start

Signifies the beginning of todo tests

    todo_start("Starting todo tests");
    # ...

todo_end

The end of the todo tests. Don't forget to call when you've finished your todo tests.

    todo_end("Finished todo tests");
    todo_end();

is_ref

Checks to see if the value given is a true reference. You can go one step further and prove a reference type to check against.

    my @non_ref qw(not a ref);
    my $true_ref = [1, 2, 3];
    
    is_ref(@non_ref, 'Name of test');
    is_ref($true_ref => 'HASH', 'Name of test'); # Checks to see if $true_ref returns a HASH

subtest

Create subtests within a test.

    use Test::Lite;

    use_ok 'Some::Module';
    
    subtest 'My test name' => sub {
        ok ref({}), 'HASH' => 'Reference type is hash';
    };

    subtest 'Another subtest' => sub {
        my $ob = Some::Module->new;
        isa_ok( $ob, 'Some::Module' => 'Matching class with object' );
    };

has_key

Searches an ArrayRef or HashRef (deeply) for a specific element or key.

    my $hash = {
        name => 'World',
        foo  => 'baz',
        berry => {
            fruit => {
                melon => 'Yum!',
            },
        },
    };

    has_key $hash, 'melon' => 'Found melon!';

    my $ary = [qw(this that there where who what)];

    has_key $ary, 'there' => 'Found "there" in arrayref'; 

plan

Declare how many tests you are going to run. This is not needed if you have included done_testing

    use Test::Lite;

    plan tests => 2;
    plan 'no_plan';
    plan skip_all => 'reason';

is_passing

Detects whether the current test suite is passing.

    is_passing or diag "Uh-Oh. We're currently failing the test..."

note

Just prints text to output(), so it should only be displayed in verbose mode.

    note 'Some note to describe stuff';

count

Counts the number of keys from a hashref, or elements from an arrayref and matches them against the expected value.

    my $h = {
        foo => 'bar',
        baz => 'foo'
    };
    count $h, 2 => 'Expecting 2 keys in hash';

    my $a = [1, 2, 3, 4];
    count $a, $a->[3] => "Expecting $a->[3] elements from array";

extended

Searches the module deeply for extended modules. ie: When you use base 'Module' or extends in most OOP frameworks.

    package Foo;
    
    use base qw/
        Foo::Baz
        Foo::Baz::Foobar
        Foo::Baz::Foobar::Frag
    /;
    
    1;

    # t/01-extends.t

    use Test::Lite;
    
    use_ok 'Foo';
    extended 'Foo' => qw/
        Foo::Baz
        Foo::Baz::Foobar::Frag
    /;
    
    done_testing;

AUTHOR ^

Brad Haywood <brad@geeksware.net>

LICENSE ^

You may distribute this code under the same terms as Perl itself.

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