Add @group CacheLive to tests

* test: add `@group CacheLive`

* docs: add about CacheLive

Author: kenjis

tests/README.md

@@ -49,9 +49,9 @@ Individual tests can be run by including the relative path to the test file.
 
 	> ./phpunit tests/system/HTTP/RequestTest.php
 
-You can run the tests without running the live database tests.
+You can run the tests without running the live database and the live cache tests.
 
-	> ./phpunit --exclude-group DatabaseLive
+	> ./phpunit --exclude-group DatabaseLive,CacheLive
 
 ## Generating Code Coverage
 

tests/system/Cache/Handlers/MemcachedHandlerTest.php

@@ -16,6 +16,8 @@
 use Exception;
 
 /**
+ * @group CacheLive
+ *
  * @internal
  */
 final class MemcachedHandlerTest extends AbstractHandlerTest

tests/system/Cache/Handlers/PredisHandlerTest.php

@@ -15,6 +15,8 @@
 use Config\Cache;
 
 /**
+ * @group CacheLive
+ *
  * @internal
  */
 final class PredisHandlerTest extends AbstractHandlerTest

tests/system/Cache/Handlers/RedisHandlerTest.php

@@ -15,6 +15,8 @@
 use Config\Cache;
 
 /**
+ * @group CacheLive
+ *
  * @internal
  */
 final class RedisHandlerTest extends AbstractHandlerTest