public function testUsesProxyEnvironmentVariables()
{
$http = getenv('HTTP_PROXY');
$https = getenv('HTTPS_PROXY');
$client = new Client();
$this->assertNull($client->getDefaultOption('proxy'));
putenv('HTTP_PROXY=127.0.0.1');
$client = new Client();
$this->assertEquals(['http' => '127.0.0.1'], $client->getDefaultOption('proxy'));
putenv('HTTPS_PROXY=127.0.0.2');
$client = new Client();
$this->assertEquals(['http' => '127.0.0.1', 'https' => '127.0.0.2'], $client->getDefaultOption('proxy'));
putenv("HTTP_PROXY={$http}");
putenv("HTTPS_PROXY={$https}");
}
