--- /dev/null
+<?php
+
+/**
+ * @file
+ * Test PHP file.
+ *
+ * This file is part of the 'test_php_file_library' test library.
+ *
+ * @see \Drupal\Tests\libraries\Kernel\ExternalLibrary\PhpFile\PhpFileLibraryTest
+ */
+
+/**
+ * A test function to be able to test whether this file was loaded or not.
+ */
+function _libraries_test_php_function() {
+}