add: Stubs for Page and PageController to ensure these symbols also exist for modules

bootstrap.php

@@ -17,6 +17,16 @@
     exit(1);
 }
 
+// Ensure that the `Page` and `PageController` classes exist, if they don't _(for example when testing a
+// silverstripe module)_ ensure that the symbols are registered.
+if (!class_exists(\Page::class)) {
+    require __DIR__ . '/stubs/Page.php';
+}
+
+if (!class_exists(\PageController::class)) {
+    require __DIR__ . '/stubs/PageController.php';
+}
+
 // Ensure global $_SERVER exists
 global $_SERVER;
 if (!$_SERVER) {

stubs/Page.php

@@ -0,0 +1,8 @@
+<?php
+
+namespace {
+
+    use SilverStripe\CMS\Model\SiteTree;
+
+    class Page extends SiteTree {}
+}

stubs/PageController.php

@@ -0,0 +1,8 @@
+<?php
+
+namespace {
+
+    use SilverStripe\CMS\Controllers\ContentController;
+
+    class PageController extends ContentController {}
+}