Add test group to skip integration tests relying on internet connection

Author: clue

README.md

@@ -1359,6 +1359,14 @@ To run the test suite, go to the project root and run:
 $ php vendor/bin/phpunit
 ```
 
+The test suite also contains a number of functional integration tests that rely
+on a stable internet connection.
+If you do not want to run these, they can simply be skipped like this:
+
+```bash
+$ php vendor/bin/phpunit --exclude-group internet
+```
+
 ## License
 
 MIT, see [LICENSE file](LICENSE).

tests/IntegrationTest.php

@@ -10,6 +10,7 @@
 use React\Socket\SecureConnector;
 use React\Socket\TcpConnector;
 
+/** @group internet */
 class IntegrationTest extends TestCase
 {
     const TIMEOUT = 5.0;