Refactoring DBA-mocking tests

- Reducing DB-dependencies
- Creating DB-cache mocks
- Creating DB-lock mocks
- Switching to mocked dependencies for Cache/Lock/App

tests/src/Core/Lock/MemcacheCacheLockDriverTest.php

@@ -15,6 +15,9 @@ class MemcacheCacheLockDriverTest extends LockTest
 {
 	protected function getInstance()
 	{
+		$this->mockConfigGet('system', 'memcache_host', 'localhost', 1);
+		$this->mockConfigGet('system', 'memcache_port', 11211, 1);
+
 		return new CacheLockDriver(CacheDriverFactory::create('memcache'));
 	}
 }