public function testReturnsSSHKeysInstance()
    {
        $digitalOcean = new DigitalOcean($this->getMockCredentials(), $this->getMockAdapter($this->never()));
        $sshKeys = $digitalOcean->sshKeys();

        $this->assertTrue(is_object($sshKeys));
        $this->assertInstanceOf('\\DigitalOcean\\SSHKeys\\SSHKeys', $sshKeys);
    }