fix: guard downloads assets without WooCommerce

composer.json

@@ -22,7 +22,10 @@
         "phpstan/extension-installer": "^1.1"
     },
     "scripts": {
-        "test": "php tests/product-versions-remote-download-regression.php"
+        "test": [
+            "php tests/downloads-page-woocommerce-guard-regression.php",
+            "php tests/product-versions-remote-download-regression.php"
+        ]
     },
     "config": {
         "allow-plugins": {

inc/class-downloads-page.php

@@ -53,7 +53,7 @@ public function override_downloads_template(string $template, string $template_n
 	 */
 	public function enqueue_assets(): void {
 
-		if ( ! is_account_page()) {
+		if ( ! function_exists('is_account_page') || ! \is_account_page()) {
 			return;
 		}
 

tests/downloads-page-woocommerce-guard-regression.php

@@ -0,0 +1,35 @@
+<?php
+/**
+ * Regression checks for Downloads_Page WooCommerce availability guards.
+ *
+ * @package WP_Update_Server_Plugin
+ */
+
+declare(strict_types=1);
+
+namespace WP_Update_Server_Plugin {
+	require_once dirname(__DIR__) . '/inc/class-downloads-page.php';
+}
+
+namespace {
+	/**
+	 * @param bool   $condition Assertion condition.
+	 * @param string $message   Failure message.
+	 * @return void
+	 */
+	function assert_true(bool $condition, string $message): void {
+
+		if ( ! $condition) {
+			throw new RuntimeException($message);
+		}
+	}
+
+	assert_true( ! function_exists('is_account_page'), 'WooCommerce is_account_page() should be unavailable in this regression test');
+
+	$reflection = new ReflectionClass(\WP_Update_Server_Plugin\Downloads_Page::class);
+	$downloads  = $reflection->newInstanceWithoutConstructor();
+
+	$downloads->enqueue_assets();
+
+	fwrite(STDOUT, "Downloads_Page WooCommerce guard regression checks passed.\n");
+}