Add unit tests for wp-cron.php functionality

tests/phpunit/tests/cron/wp-cron.php

@@ -0,0 +1,131 @@
+<?php
+
+/**
+ * Test wp-cron.php functionality.
+ *
+ * @group cron
+ */
+class Tests_Cron_WPCron extends WP_UnitTestCase {
+	/**
+	 * Set up the test fixture.
+	 */
+	public function set_up() {
+		parent::set_up();
+		_set_cron_array( array() );
+	}
+
+	/**
+	 * Clean up after each test.
+	 */
+	public function tear_down() {
+		_set_cron_array( array() );
+		delete_transient( 'doing_cron' );
+		parent::tear_down();
+	}
+
+	/**
+	 * Test that scheduled events are rescheduled correctly when wp-cron.php is called.
+	 *
+	 * @ticket 47590
+	 */
+	public function test_scheduled_events_are_rescheduled() {
+		$timestamp = time();
+		$hook      = 'test_schedule_event';
+		wp_schedule_event( $timestamp, 'hourly', $hook );
+
+		$initial_timestamp = wp_next_scheduled( $hook );
+		$this->assertNotFalse( $initial_timestamp, 'Event should be scheduled' );
+
+		$this->simulate_wp_cron();
+
+		$next_timestamp = wp_next_scheduled( $hook );
+		$this->assertNotFalse( $next_timestamp, 'Event should be rescheduled' );
+
+		$this->assertEqualsWithDelta(
+			$initial_timestamp + HOUR_IN_SECONDS,
+			$next_timestamp,
+			60,
+			'Next run should be scheduled approximately one hour after the initial run'
+		);
+	}
+
+	/**
+	 * Test that single events are removed after running.
+	 *
+	 * @ticket 47590
+	 */
+	public function test_single_events_are_removed() {
+		$timestamp = time();
+		$hook      = 'test_single_event';
+		wp_schedule_single_event( $timestamp, $hook );
+
+		$this->assertNotFalse( wp_next_scheduled( $hook ), 'Event should be scheduled initially' );
+		$this->simulate_wp_cron();
+		$this->assertFalse( wp_next_scheduled( $hook ), 'Single event should be removed after running' );
+	}
+
+	/**
+	 * Test that future events are not changed when wp-cron.php runs.
+	 *
+	 * @ticket 47590
+	 */
+	public function test_future_events_unchanged() {
+		$timestamp = time() + DAY_IN_SECONDS;
+		$hook      = 'test_future_event';
+		wp_schedule_event( $timestamp, 'daily', $hook );
+
+		$scheduled_time = wp_next_scheduled( $hook );
+		$this->assertNotFalse( $scheduled_time, 'Event should be scheduled' );
+
+		$this->simulate_wp_cron();
+
+		$this->assertEquals(
+			$scheduled_time,
+			wp_next_scheduled( $hook ),
+			'Future event time should remain unchanged'
+		);
+	}
+
+	/**
+	 * Test that the doing_cron transient is deleted after wp-cron.php runs.
+	 *
+	 * @ticket 47590
+	 */
+	public function test_doing_cron_transient_deleted() {
+		set_transient( 'doing_cron', microtime( true ) );
+		$this->simulate_wp_cron();
+		$this->assertFalse( get_transient( 'doing_cron' ) );
+	}
+
+	/**
+	 * Helper function to simulate wp-cron.php running.
+	 */
+	private function simulate_wp_cron() {
+		if ( ! defined( 'DOING_CRON' ) ) {
+			define( 'DOING_CRON', true );
+		}
+
+		$crons = wp_get_ready_cron_jobs();
+		foreach ( $crons as $timestamp => $cronhooks ) {
+			foreach ( $cronhooks as $hook => $keys ) {
+				foreach ( $keys as $k => $v ) {
+					$scheduled_args = $v['args'];
+					wp_unschedule_event( $timestamp, $hook, $scheduled_args );
+					do_action_ref_array( $hook, $scheduled_args );
+
+					if ( isset( $v['schedule'] ) ) {
+						$next_timestamp = wp_next_scheduled( $hook, $scheduled_args );
+						if ( ! $next_timestamp ) {
+							$schedules = wp_get_schedules();
+							if ( isset( $schedules[ $v['schedule'] ] ) ) {
+								$interval = $schedules[ $v['schedule'] ]['interval'];
+								wp_schedule_event( $timestamp + $interval, $v['schedule'], $hook, $scheduled_args );
+							}
+						}
+					}
+				}
+			}
+		}
+		delete_transient( 'doing_cron' );
+	}
+}