Tests: reset timezone related options if the tests change them

The `options` table is **not** reset after each test/test class, so if an option is changed during a tests, it should be reset to the default value _after_ the test.

This commit does so for those tests which didn't have such resetting in place yet, while one or more tests in the class _do_ change the value of the `timezone_string` option.

Follow up on Trac#45821, [45857]

Author: jrfnl

tests/phpunit/tests/date/currentTime.php

@@ -7,6 +7,17 @@
  */
 class Tests_Date_CurrentTime extends WP_UnitTestCase {
 
+	/**
+	 * Clean up.
+	 */
+	public function tear_down() {
+		// Reset changed options to their default value.
+		update_option( 'gmt_offset', 0 );
+		update_option( 'timezone_string', '' );
+
+		parent::tear_down();
+	}
+
 	/**
 	 * @ticket 34378
 	 */

tests/phpunit/tests/date/dateI18n.php

@@ -7,6 +7,17 @@
  */
 class Tests_Date_DateI18n extends WP_UnitTestCase {
 
+	/**
+	 * Clean up.
+	 */
+	public function tear_down() {
+		// Reset changed options to their default value.
+		update_option( 'gmt_offset', 0 );
+		update_option( 'timezone_string', '' );
+
+		parent::tear_down();
+	}
+
 	/**
 	 * @ticket 28636
 	 */

tests/phpunit/tests/date/getFeedBuildDate.php

@@ -11,7 +11,7 @@ class Tests_Date_GetFeedBuildDate extends WP_UnitTestCase {
 	public function tear_down() {
 		global $wp_query;
 
-		update_option( 'timezone_string', 'UTC' );
+		update_option( 'timezone_string', '' );
 
 		unset( $wp_query );
 

tests/phpunit/tests/date/getPermalink.php

@@ -10,7 +10,7 @@ class Tests_Date_GetPermalink extends WP_UnitTestCase {
 
 	public function tear_down() {
 		delete_option( 'permalink_structure' );
-		update_option( 'timezone_string', 'UTC' );
+		update_option( 'timezone_string', '' );
 		// phpcs:ignore WordPress.DateTime.RestrictedFunctions.timezone_change_date_default_timezone_set
 		date_default_timezone_set( 'UTC' );
 

tests/phpunit/tests/date/getPostTime.php

@@ -9,6 +9,16 @@
  */
 class Tests_Date_GetPostTime extends WP_UnitTestCase {
 
+	/**
+	 * Clean up.
+	 */
+	public function tear_down() {
+		// Reset the timezone option to the default value.
+		update_option( 'timezone_string', '' );
+
+		parent::tear_down();
+	}
+
 	/**
 	 * @ticket 28310
 	 */

tests/phpunit/tests/date/mysql2date.php

@@ -11,6 +11,9 @@ public function tear_down() {
 		// phpcs:ignore WordPress.DateTime.RestrictedFunctions.timezone_change_date_default_timezone_set
 		date_default_timezone_set( 'UTC' );
 
+		// Reset the timezone option to the default value.
+		update_option( 'timezone_string', '' );
+
 		parent::tear_down();
 	}
 

tests/phpunit/tests/date/query.php

@@ -21,6 +21,16 @@ public function set_up() {
 		$this->q = new WP_Date_Query( array( 'm' => 2 ) );
 	}
 
+	/**
+	 * Clean up.
+	 */
+	public function tear_down() {
+		// Reset the timezone option to the default value.
+		update_option( 'timezone_string', '' );
+
+		parent::tear_down();
+	}
+
 	public function test_construct_date_query_empty() {
 		$q = new WP_Date_Query( array() );
 		$this->assertSame( 'AND', $q->relation );

tests/phpunit/tests/date/wpTimezone.php

@@ -8,6 +8,17 @@
  */
 class Tests_Date_wpTimezone extends WP_UnitTestCase {
 
+	/**
+	 * Clean up.
+	 */
+	public function tear_down() {
+		// Reset changed options to their default value.
+		update_option( 'gmt_offset', 0 );
+		update_option( 'timezone_string', '' );
+
+		parent::tear_down();
+	}
+
 	/**
 	 * @ticket 24730
 	 *

tests/phpunit/tests/date/xmlrpc.php

@@ -8,6 +8,16 @@
  */
 class Tests_Date_XMLRPC extends WP_XMLRPC_UnitTestCase {
 
+	/**
+	 * Clean up.
+	 */
+	public function tear_down() {
+		// Reset the timezone option to the default value.
+		update_option( 'timezone_string', '' );
+
+		parent::tear_down();
+	}
+
 	/**
 	 * @ticket 30429
 	 *

tests/phpunit/tests/formatting/date.php

@@ -6,6 +6,17 @@
  */
 class Tests_Formatting_Date extends WP_UnitTestCase {
 
+	/**
+	 * Clean up.
+	 */
+	public function tear_down() {
+		// Reset changed options to their default value.
+		update_option( 'gmt_offset', 0 );
+		update_option( 'timezone_string', '' );
+
+		parent::tear_down();
+	}
+
 	/**
 	 * Unpatched, this test passes only when Europe/London is not observing DST.
 	 *