Automated testing: PHPUnit passes Behat passes Manual testing Execute the following:  $ git grep -A1 "\( question_preview_url\| question_preview_popup_params\|question_hash\| question_make_export_url\| question_get_export_single_question_url\|question_get_export_single_question_url\|question_remove_stale_questions_from_category\|flatten_category_tree\| add_indented_names\| question_category_select_menu\| get_categories_for_contexts\| question_category_options\| question_add_context_in_key\| question_fix_top_names\|get_slot_tags_for_slot_id\|quiz_retrieve_tags_for_slot_ids\|submit_tags_form\|get_bulk_action_key\|preview_question_url\|process_actions\|process_actions_needing_ui\| question_is_only_child_of_top_category_in_context\|question_is_top_category\|question_can_delete_cat\| print_choose_qtype_to_add_form\| create_new_question_button\|question_preview_link\|core_question_output_fragment_tags_form\|render_qbank_chooser\|question_hash\| qbank_chooser\|qbank_chooser_types\|qbank_chooser_qtype\|qbank_chooser_title\| question_preview_question_pluginfile\| question_preview_action_url\| question_preview_form_url\| restart_preview\)" -- ":(exclude)lib/listlib.php" ":(exclude)mod/quiz/classes/local/reports/attempts_report.php" ":(exclude)mod/quiz/classes/question/bank/filter/custom_category_condition_helper.php" ":(exclude)mod/quiz/report/*" ":(exclude)question/bank/editquestion/*" ":(exclude)question/bank/exportquestions/*" ":(exclude)question/bank/exporttoxml/*" ":(exclude)question/bank/managecategories/*" ":(exclude)question/bank/previewquestion/*" ":(exclude)question/bank/tagquestion/*" ":(exclude)question/behaviour/*" ":(exclude)question/type/*" ":(exclude)lib/form/questioncategory.php" ":(exclude)lib/deprecatedlib.php" ":(exclude)mod/quiz/classes/output/renderer.php" ":(exclude)mod/quiz/classes/quiz_attempt.php" Confirm it returns only function stubs (that throw exception), and upgrade notes regarding the functions Execute the following:  $ git log --diff-filter=D --summary --oneline -- question/category_class.php $ git log --diff-filter=D --summary --oneline -- question/category_form.php $ git log --diff-filter=D --summary --oneline -- question/export_form.php $ git log --diff-filter=D --summary --oneline -- question/import_form.php $ git log --diff-filter=D --summary --oneline -- question/move_form.php $ git log --diff-filter=D --summary --oneline -- question/previewlib.php $ git log --diff-filter=D --summary --oneline -- question/yui/src/preview/js/preview.js $ git log --diff-filter=D --summary --oneline -- question/amd/src/selectors.js $ git log --diff-filter=D --summary --oneline -- question/amd/src/repository.js $ git log --diff-filter=D --summary --oneline -- question/amd/src/edit_tags.js Confirm  it returns only "delete mode 100644 <filename>"