Tests: Prevent state leaks in functions tests

tests/phpunit/tests/functions/forceSslAdmin.php

@@ -16,6 +16,12 @@ public function set_up() {
 		force_ssl_admin( false );
 	}
 
+	public function tear_down() {
+		force_ssl_admin( false );
+
+		parent::tear_down();
+	}
+
 	/**
 	 * Tests that force_ssl_admin() returns expected values based on various inputs.
 	 *

tests/phpunit/tests/functions/wpTimezoneChoice.php

@@ -10,10 +10,23 @@
 class Tests_Functions_WpTimezoneChoice extends WP_UnitTestCase {
 
 	/**
-	 * Restores the current locale after each test runs.
+	 * Whether timezone translations need to be restored after the test.
+	 *
+	 * @var bool
+	 */
+	private $restore_timezone_translations = false;
+
+	/**
+	 * Restores the current locale and timezone translations after each test runs.
 	 */
 	public function tear_down(): void {
 		restore_current_locale();
+
+		if ( $this->restore_timezone_translations ) {
+			// Synchronize the function's static locale tracking with the restored translations.
+			wp_timezone_choice( '', get_locale() );
+		}
+
 		parent::tear_down();
 	}
 
@@ -98,7 +111,8 @@
 	 * @param string $expected Expected string HTML fragment.
 	 */
 	public function test_wp_timezone_choice_es( string $expected ): void {
+		$this->restore_timezone_translations = true;
 		$timezone_list = wp_timezone_choice( '', 'es_ES' );
 		$this->assertStringContainsString( $expected, $timezone_list );
 	}
 
@@ -125,6 +139,7 @@
 	 * @param string $expected Expected string HTML fragment.
 	 */
 	public function test_wp_timezone_choice_es_set( string $expected ): void {
+		$this->restore_timezone_translations = true;
 		switch_to_locale( 'es_ES' );
 		$timezone_list = wp_timezone_choice( '' );
 		$this->assertStringContainsString( $expected, $timezone_list );