public function testInstantiationWithDefaults()
{
$defaults = ['channel' => '#random', 'username' => 'Archer', 'icon' => ':ghost:', 'link_names' => true, 'unfurl_links' => true, 'unfurl_media' => false, 'allow_markdown' => false, 'markdown_in_attachments' => ['text']];
$client = new Client('http://fake.endpoint', $defaults);
$this->assertSame($defaults['channel'], $client->getDefaultChannel());
$this->assertSame($defaults['username'], $client->getDefaultUsername());
$this->assertSame($defaults['icon'], $client->getDefaultIcon());
$this->assertTrue($client->getLinkNames());
$this->assertTrue($client->getUnfurlLinks());
$this->assertFalse($client->getUnfurlMedia());
$this->assertSame($defaults['allow_markdown'], $client->getAllowMarkdown());
$this->assertSame($defaults['markdown_in_attachments'], $client->getMarkdownInAttachments());
}