Creating and requiring fixtures

You can create fixtures with normal Moo syntax. You can even make them lazy if you want and require the composing class to provide the builder:

    has fixture => (
        is => 'lazy'
    );
    requires '_build_fixture';

Because this is a Moo::Role, you can require any method you like, not just builders.

See Moo::Role and Role::Tiny for everything you can do with roles.

Setup and teardown

You can add method modifiers around the "setup" and "teardown" methods and these will be run before tests begin and after tests finish (respectively).

    before  setup     => sub { ... };
    after   teardown  => sub { ... };

You can also add method modifiers around "each_test", which will be run before and after every individual test. You could use these to prepare or reset a fixture.

    has fixture => ( is => 'lazy, clearer => 1, predicate => 1 );
    after  each_test => sub { shift->clear_fixture };

Roles may also modify "setup", "teardown", and "each_test", so the order that modifiers will be called will depend on when roles are composed. Be careful with "each_test", though, because the global effect may make composition more fragile.

You can call test functions in modifiers. For example, you could confirm that something has been set up or cleaned up.

    before each_test => sub { ok( ! shift->has_fixture ) };

test

    test $label => sub { ... };

The "test" function adds a subtest. The code reference will be called with the test object as its only argument.

Tests are run in the order declared, so the order of tests from roles will depend on when they are composed relative to other test declarations.