public function testGetConfigValueByKey()
{
$config = $this->createConfig();
$this->assertEquals($this->homedir . '/gush', $config->get('home'));
$this->assertEquals($this->homedir . '/gush/.gush.yml', $config->get('home_config'));
$this->assertNull($config->get('no-key'));
$this->assertEquals([], $config->get('adapters', Config::CONFIG_ALL));
$this->assertEquals([], $config->get('adapters', Config::CONFIG_SYSTEM));
$this->assertNull($config->get('adapters', Config::CONFIG_LOCAL));
}