Tests that show register shutdown function issue (#70) is invalid

features/cron-event.feature

@@ -85,3 +85,54 @@ Feature: Manage WP Cron events
       """
       Error: Unscheduling events is only supported from WordPress 4.9.0 onwards.
       """
+
+  Scenario: Run cron event with a registered shutdown function
+    Given a wp-content/mu-plugins/setup_shutdown_function.php file:
+      """
+      add_action('mycron', function() {
+        breakthings();
+      });
+
+      register_shutdown_function(function() {
+        $error = error_get_last();
+        if ($error['type'] === E_ERROR) {
+          WP_CLI::line('MY SHUTDOWN FUNCTION');
+        }
+        });
+      """
+
+    When I run `wp cron event schedule mycron now`
+    And I try `wp cron event run --due-now`
+    Then STDOUT should contain:
+      """
+      MY SHUTDOWN FUNCTION
+      """
+
+  Scenario: Run cron event with a registered shutdown function that logs to a file
+    Given a wp-content/mu-plugins/setup_shutdown_function_log.php file:
+      """
+      <?php
+      add_action('mycronlog', function() {
+        breakthings();
+      });
+
+      register_shutdown_function(function() {
+        error_log('LOG A SHUTDOWN FROM ERROR');
+        // file_put_contents( dirname( __FILE__ ) . '/log.log', print_r( 'Shutdown called correctly', true ) . "\r\n\r\n", FILE_APPEND );
+      });
+      """
+
+    And I run `wp config set WP_DEBUG true --raw`
+    And I run `wp config set WP_DEBUG_LOG '{RUN_DIR}/server.log'`
+
+    When I try `wp cron event schedule mycronlog now`
+    And I try `wp cron event run --due-now`
+    Then STDERR should contain:
+      """
+      Call to undefined function breakthings()
+      """
+    Then the {RUN_DIR}/server.log file should exist
+    And the {RUN_DIR}/server.log file should contain:
+      """
+      LOG A SHUTDOWN FROM ERROR
+      """