public function testMetadataSetGetDelete()
{
$catalogue = new MessageCatalogue('en');
$catalogue->setMetadata('key', 'value');
$this->assertEquals('value', $catalogue->getMetadata('key', 'messages'), "Metadata 'key' = 'value'");
$catalogue->setMetadata('key2', array());
$this->assertEquals(array(), $catalogue->getMetadata('key2', 'messages'), 'Metadata key2 is array');
$catalogue->deleteMetadata('key2', 'messages');
$this->assertNull($catalogue->getMetadata('key2', 'messages'), 'Metadata key2 should is deleted.');
$catalogue->deleteMetadata('key2', 'domain');
$this->assertNull($catalogue->getMetadata('key2', 'domain'), 'Metadata key2 should is deleted.');
}
