diff --git a/tests/tests/class-core.php b/tests/tests/class-core.php
index 3be04c9..df1601d 100644
--- a/tests/tests/class-core.php
+++ b/tests/tests/class-core.php
@@ -1,276 +1,18 @@
 <?php
+// phpcs:ignoreFile
 namespace HM\Cavalcade\Tests;
 
-use WP_UnitTestCase;
+use Tests_Cron;
 
 /**
- * Duplicate the WordPress Core tests
+ * Run the WordPress Core tests
  *
  * This ensures Cavalcade behaves in the same way
  * as WordPress Core.
  */
-class Tests_Core extends WP_UnitTestCase {
-	function setUp() {
-		parent::setUp();
-		// make sure the schedule is clear
-		_set_cron_array(array());
-	}
-
-	function tearDown() {
-		// make sure the schedule is clear
-		_set_cron_array(array());
-		parent::tearDown();
-	}
-
-	function test_wp_get_schedule_empty() {
-		// nothing scheduled
-		$hook = __FUNCTION__;
-		$this->assertFalse(wp_get_schedule($hook));
-	}
-
-	function test_schedule_event_single() {
-		// schedule an event and make sure it's returned by wp_next_scheduled
-		$hook = __FUNCTION__;
-		$timestamp = strtotime('+1 hour');
-
-		wp_schedule_single_event( $timestamp, $hook );
-		$this->assertEquals( $timestamp, wp_next_scheduled($hook) );
-
-		// it's a non recurring event
-		$this->assertEquals( '', wp_get_schedule($hook) );
-
-	}
-
-	function test_schedule_event_single_args() {
-		// schedule an event with arguments and make sure it's returned by wp_next_scheduled
-		$hook = 'event';
-		$timestamp = strtotime('+1 hour');
-		$args = array('foo');
-
-		wp_schedule_single_event( $timestamp, $hook, $args );
-		// this returns the timestamp only if we provide matching args
-		$this->assertEquals( $timestamp, wp_next_scheduled($hook, $args) );
-		// these don't match so return nothing
-		$this->assertEquals( false, wp_next_scheduled($hook) );
-		$this->assertEquals( false, wp_next_scheduled($hook, array('bar')) );
-
-		// it's a non recurring event
-		$this->assertEquals( '', wp_get_schedule($hook, $args) );
-	}
-
-	function test_schedule_event() {
-		// schedule an event and make sure it's returned by wp_next_scheduled
-		$hook = __FUNCTION__;
-		$recur = 'hourly';
-		$timestamp = strtotime('+1 hour');
-
-		wp_schedule_event( $timestamp, $recur, $hook );
-		// it's scheduled for the right time
-		$this->assertEquals( $timestamp, wp_next_scheduled($hook) );
-		// it's a recurring event
-		$this->assertEquals( $recur, wp_get_schedule($hook) );
-	}
-
-	function test_schedule_event_args() {
-		// schedule an event and make sure it's returned by wp_next_scheduled
-		$hook = 'event';
-		$timestamp = strtotime('+1 hour');
-		$recur = 'hourly';
-		$args = array('foo');
-
-		wp_schedule_event( $timestamp, 'hourly', $hook, $args );
-		// this returns the timestamp only if we provide matching args
-		$this->assertEquals( $timestamp, wp_next_scheduled($hook, $args) );
-		// these don't match so return nothing
-		$this->assertEquals( false, wp_next_scheduled($hook) );
-		$this->assertEquals( false, wp_next_scheduled($hook, array('bar')) );
-
-		$this->assertEquals( $recur, wp_get_schedule($hook, $args) );
-
-	}
-
-	function test_unschedule_event() {
-		// schedule an event and make sure it's returned by wp_next_scheduled
-		$hook = __FUNCTION__;
-		$timestamp = strtotime('+1 hour');
-
-		wp_schedule_single_event( $timestamp, $hook );
-		$this->assertEquals( $timestamp, wp_next_scheduled($hook) );
-
-		// now unschedule it and make sure it's gone
-		wp_unschedule_event( $timestamp, $hook );
-		$this->assertEquals( false, wp_next_scheduled($hook) );
-	}
-
-	function test_clear_schedule() {
-		$hook = __FUNCTION__;
-		$args = array( 'arg1' );
-
-		// schedule several events with and without arguments
-		wp_schedule_single_event( strtotime('+1 hour'), $hook );
-		wp_schedule_single_event( strtotime('+2 hour'), $hook );
-		wp_schedule_single_event( strtotime('+3 hour'), $hook, $args );
-		wp_schedule_single_event( strtotime('+4 hour'), $hook, $args );
-
-		// make sure they're returned by wp_next_scheduled()
-		$this->assertTrue( wp_next_scheduled($hook) > 0 );
-		$this->assertTrue( wp_next_scheduled($hook, $args) > 0 );
-
-		// clear the schedule for the no args events and make sure it's gone
-		wp_clear_scheduled_hook($hook);
-		$this->assertFalse( wp_next_scheduled($hook) );
-		// the args events should still be there
-		$this->assertTrue( wp_next_scheduled($hook, $args) > 0 );
-
-		// clear the schedule for the args events and make sure they're gone too
-		// note: wp_clear_scheduled_hook() expects args passed directly, rather than as an array
-		wp_clear_scheduled_hook($hook, $args);
-		$this->assertFalse( wp_next_scheduled($hook, $args) );
-	}
-
-	function test_clear_schedule_multiple_args() {
-		$hook = __FUNCTION__;
-		$args = array( 'arg1', 'arg2' );
-
-		// schedule several events with and without arguments
-		wp_schedule_single_event( strtotime('+1 hour'), $hook );
-		wp_schedule_single_event( strtotime('+2 hour'), $hook );
-		wp_schedule_single_event( strtotime('+3 hour'), $hook, $args );
-		wp_schedule_single_event( strtotime('+4 hour'), $hook, $args );
-
-		// make sure they're returned by wp_next_scheduled()
-		$this->assertTrue( wp_next_scheduled($hook) > 0 );
-		$this->assertTrue( wp_next_scheduled($hook, $args) > 0 );
-
-		// clear the schedule for the no args events and make sure it's gone
-		wp_clear_scheduled_hook($hook);
-		$this->assertFalse( wp_next_scheduled($hook) );
-		// the args events should still be there
-		$this->assertTrue( wp_next_scheduled($hook, $args) > 0 );
-
-		// clear the schedule for the args events and make sure they're gone too
-		// note: wp_clear_scheduled_hook() used to expect args passed directly, rather than as an array pre WP 3.0
-		wp_clear_scheduled_hook($hook, $args);
-		$this->assertFalse( wp_next_scheduled($hook, $args) );
-	}
-
-	/**
-	 * @ticket WordPress Core 10468
+class Tests_Core extends Tests_Cron {
+	/*
+	 * This is intentionally an empty class to trigger
+	 * the WordPress core tests run.
 	 */
-	function test_clear_schedule_new_args() {
-		$hook = __FUNCTION__;
-		$args = array( 'arg1' );
-		$multi_hook = __FUNCTION__ . '_multi';
-		$multi_args = array( 'arg2', 'arg3' );
-
-		// schedule several events with and without arguments
-		wp_schedule_single_event( strtotime('+1 hour'), $hook );
-		wp_schedule_single_event( strtotime('+2 hour'), $hook );
-		wp_schedule_single_event( strtotime('+3 hour'), $hook, $args );
-		wp_schedule_single_event( strtotime('+4 hour'), $hook, $args );
-		wp_schedule_single_event( strtotime('+5 hour'), $multi_hook, $multi_args );
-		wp_schedule_single_event( strtotime('+6 hour'), $multi_hook, $multi_args );
-
-		// make sure they're returned by wp_next_scheduled()
-		$this->assertTrue( wp_next_scheduled($hook) > 0 );
-		$this->assertTrue( wp_next_scheduled($hook, $args) > 0 );
-
-		// clear the schedule for the no args events and make sure it's gone
-		wp_clear_scheduled_hook($hook);
-		$this->assertFalse( wp_next_scheduled($hook) );
-		// the args events should still be there
-		$this->assertTrue( wp_next_scheduled($hook, $args) > 0 );
-
-		// clear the schedule for the args events and make sure they're gone too
-		// wp_clear_scheduled_hook() should take args as an array like the other functions.
-		wp_clear_scheduled_hook($hook, $args);
-		$this->assertFalse( wp_next_scheduled($hook, $args) );
-
-		// clear the schedule for the args events and make sure they're gone too
-		// wp_clear_scheduled_hook() should take args as an array like the other functions and does from WP 3.0
-		wp_clear_scheduled_hook($multi_hook, $multi_args);
-		$this->assertFalse( wp_next_scheduled($multi_hook, $multi_args) );
-	}
-
-	/**
-	 * @ticket WordPress Core 18997
-	 */
-	function test_unschedule_hook() {
-		$hook = __FUNCTION__;
-		$args = array( rand_str() );
-
-		// schedule several events with and without arguments.
-		wp_schedule_single_event( strtotime( '+1 hour' ), $hook );
-		wp_schedule_single_event( strtotime( '+2 hour' ), $hook );
-		wp_schedule_single_event( strtotime( '+3 hour' ), $hook, $args );
-		wp_schedule_single_event( strtotime( '+4 hour' ), $hook, $args );
-
-		// make sure they're returned by wp_next_scheduled().
-		$this->assertTrue( wp_next_scheduled( $hook ) > 0 );
-		$this->assertTrue( wp_next_scheduled( $hook, $args ) > 0 );
-
-		// clear the schedule and make sure it's gone.
-		wp_unschedule_hook( $hook );
-		$this->assertFalse( wp_next_scheduled( $hook ) );
-	}
-
-	/**
-	 * @ticket WordPress Core 6966
-	 */
-	function test_duplicate_event() {
-		// duplicate events close together should be skipped
-		$hook = __FUNCTION__;
-		$args = array( 'arg1' );
-		$ts1 = strtotime('+5 minutes');
-		$ts2 = strtotime('+3 minutes');
-
-		// first one works
-		wp_schedule_single_event( $ts1, $hook, $args );
-		// second one is ignored
-		wp_schedule_single_event( $ts2, $hook, $args );
-
-		// the next event should be at +5 minutes, not +3
-		$this->assertEquals( $ts1, wp_next_scheduled($hook, $args) );
-	}
-
-	/**
-	 * @ticket WordPress Core 6966
-	 */
-	function test_not_duplicate_event() {
-		// duplicate events far apart should work normally
-		$hook = __FUNCTION__;
-		$args = array( 'arg1' );
-		$ts1 = strtotime( '+30 minutes' );
-		$ts2 = strtotime( '+3 minutes' );
-
-		// first one works
-		wp_schedule_single_event( $ts1, $hook, $args );
-		// second works too
-		wp_schedule_single_event( $ts2, $hook, $args );
-
-		// the next event should be at +3 minutes, even though that one was scheduled second
-		$this->assertEquals( $ts2, wp_next_scheduled( $hook, $args ) );
-		wp_unschedule_event( $ts2, $hook, $args );
-		// following event at +30 minutes should be there too
-		$this->assertEquals( $ts1, wp_next_scheduled( $hook, $args ) );
-	}
-
-	function test_not_duplicate_event_reversed() {
-		// duplicate events far apart should work normally regardless of order
-		$hook = __FUNCTION__;
-		$args = array( 'arg1' );
-		$ts1 = strtotime( '+3 minutes' );
-		$ts2 = strtotime( '+30 minutes' );
-
-		// first one works
-		wp_schedule_single_event( $ts1, $hook, $args );
-		// second works too
-		wp_schedule_single_event( $ts2, $hook, $args );
-
-		// the next event should be at +3 minutes
-		$this->assertEquals( $ts1, wp_next_scheduled( $hook, $args ) );
-		wp_unschedule_event( $ts1, $hook, $args );
-		// following event should be there too
-		$this->assertEquals( $ts2, wp_next_scheduled( $hook, $args ) );
-	}
 }