MDL-75913 behat: Add support for file uploads in generators

lib/testing/generator/module_generator.php

@@ -200,6 +200,7 @@ abstract class testing_module_generator extends component_generator_base {
             'conditionfieldgroup' => array(),
             'conditioncompletiongroup' => array()
         );
+
         foreach ($defaults as $key => $value) {
             if (!isset($moduleinfo->$key)) {
                 $moduleinfo->$key = $value;
@@ -277,9 +278,21 @@ abstract class testing_module_generator extends component_generator_base {
         $moduleinfo = add_moduleinfo($record, $course);
 
         // Prepare object to return with additional field cmid.
-        $instance = $DB->get_record($this->get_modulename(), array('id' => $moduleinfo->instance), '*', MUST_EXIST);
+        $modulename = $this->get_modulename();
+        $instance = $DB->get_record($modulename, ['id' => $moduleinfo->instance], '*', MUST_EXIST);
         $instance->cmid = $moduleinfo->coursemodule;
 
+        // Insert files for the 'intro' file area.
+        $instance = $this->insert_files(
+            $instance,
+            $record,
+            $modulename,
+            \context_module::instance($instance->cmid),
+            "mod_{$modulename}",
+            'intro',
+            0
+        );
+
         // If the theme was initialised while creating the module instance, something somewhere called an output
         // function. Rather than leaving this as a hard-to-debug situation, let's make it fail with a clear error.
         $outputstartedafter = $PAGE->get_where_theme_was_initialised();