Tests: Move dbDelta() tests to the db directory.

This aims to bring some consistency with other database-related tests.

Includes adding a missing `@covers` tag to the class DocBlock.

Follow-up to [30345], [32108], [32770], [51798].

Props pbearne, SergeyBiryukov.
See #56793, #56782.

git-svn-id: https://develop.svn.wordpress.org/trunk@54711 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/tests/db/dbDelta.php

@@ -5,8 +5,10 @@
  *
  * @group upgrade
  * @group dbdelta
+ *
+ * @covers ::dbDelta
  */
-class Tests_dbDelta extends WP_UnitTestCase {
+class Tests_DB_dbDelta extends WP_UnitTestCase {
 
 	/**
 	 * The maximum size of an index with utf8mb4 collation and charset with a standard

tests/phpunit/tests/db/realEscape.php

@@ -3,7 +3,8 @@
 /**
  * Test WPDB _real_escape() method.
  *
- * @group  wpdb
+ * @group wpdb
+ *
  * @covers wpdb::_real_escape
  */
 class Tests_DB_RealEscape extends WP_UnitTestCase {