Reduce MMU2 code, add test

Marlin/src/gcode/bedlevel/abl/G29.cpp

       for (uint8_t i = 0; i < 3; ++i) {
         if (verbose_level) SERIAL_ECHOLNPAIR("Probing point ", int(i), "/3.");
         #if HAS_DISPLAY
-          ui.status_printf_P(0, PSTR(S_FMT" %i/3"), GET_TEXT(MSG_PROBING_MESH), int(i));
+          ui.status_printf_P(0, PSTR(S_FMT " %i/3"), GET_TEXT(MSG_PROBING_MESH), int(i));
         #endif
 
         // Retain the last probe position

Marlin/src/lcd/menu/menu_mmu2.cpp

   START_MENU();
   BACK_ITEM(MSG_MMU2_MENU);
   ACTION_ITEM(MSG_MMU2_ALL, action_mmu2_load_all);
-  ACTION_ITEM_N(0, MSG_MMU2_FILAMENT_N, []{ _mmu2_load_filament(0); });
-  ACTION_ITEM_N(1, MSG_MMU2_FILAMENT_N, []{ _mmu2_load_filament(1); });
-  ACTION_ITEM_N(2, MSG_MMU2_FILAMENT_N, []{ _mmu2_load_filament(2); });
-  ACTION_ITEM_N(3, MSG_MMU2_FILAMENT_N, []{ _mmu2_load_filament(3); });
-  ACTION_ITEM_N(4, MSG_MMU2_FILAMENT_N, []{ _mmu2_load_filament(4); });
+  LOOP_L_N(i, 5) ACTION_ITEM_N(i, MSG_MMU2_FILAMENT_N, []{ _mmu2_load_filament(MenuItemBase::itemIndex); });
   END_MENU();
 }
 
 void menu_mmu2_load_to_nozzle() {
   START_MENU();
   BACK_ITEM(MSG_MMU2_MENU);
-  ACTION_ITEM_N(0, MSG_MMU2_FILAMENT_N, []{ action_mmu2_load_filament_to_nozzle(0); });
-  ACTION_ITEM_N(1, MSG_MMU2_FILAMENT_N, []{ action_mmu2_load_filament_to_nozzle(1); });
-  ACTION_ITEM_N(2, MSG_MMU2_FILAMENT_N, []{ action_mmu2_load_filament_to_nozzle(2); });
-  ACTION_ITEM_N(3, MSG_MMU2_FILAMENT_N, []{ action_mmu2_load_filament_to_nozzle(3); });
-  ACTION_ITEM_N(4, MSG_MMU2_FILAMENT_N, []{ action_mmu2_load_filament_to_nozzle(4); });
+  LOOP_L_N(i, 5) ACTION_ITEM_N(i, MSG_MMU2_FILAMENT_N, []{ action_mmu2_load_filament_to_nozzle(MenuItemBase::itemIndex); });
   END_MENU();
 }
 
 void menu_mmu2_eject_filament() {
   START_MENU();
   BACK_ITEM(MSG_MMU2_MENU);
-  ACTION_ITEM_N(0, MSG_MMU2_FILAMENT_N, []{ _mmu2_eject_filament(0); });
-  ACTION_ITEM_N(1, MSG_MMU2_FILAMENT_N, []{ _mmu2_eject_filament(1); });
-  ACTION_ITEM_N(2, MSG_MMU2_FILAMENT_N, []{ _mmu2_eject_filament(2); });
-  ACTION_ITEM_N(3, MSG_MMU2_FILAMENT_N, []{ _mmu2_eject_filament(3); });
-  ACTION_ITEM_N(4, MSG_MMU2_FILAMENT_N, []{ _mmu2_eject_filament(4); });
+  LOOP_L_N(i, 5) ACTION_ITEM_N(i, MSG_MMU2_FILAMENT_N, []{ _mmu2_eject_filament(MenuItemBase::itemIndex); });
   END_MENU();
 }
 
   #if LCD_HEIGHT > 2
     STATIC_ITEM(MSG_MMU2_CHOOSE_FILAMENT_HEADER, SS_CENTER|SS_INVERT);
   #endif
-  ACTION_ITEM_N(0, MSG_MMU2_FILAMENT_N, []{ action_mmu2_choose(0); });
-  ACTION_ITEM_N(1, MSG_MMU2_FILAMENT_N, []{ action_mmu2_choose(1); });
-  ACTION_ITEM_N(2, MSG_MMU2_FILAMENT_N, []{ action_mmu2_choose(2); });
-  ACTION_ITEM_N(3, MSG_MMU2_FILAMENT_N, []{ action_mmu2_choose(3); });
-  ACTION_ITEM_N(4, MSG_MMU2_FILAMENT_N, []{ action_mmu2_choose(4); });
+  LOOP_L_N(i, 5) ACTION_ITEM_N(i, MSG_MMU2_FILAMENT_N, []{ action_mmu2_choose(MenuItemBase::itemIndex); });
   END_MENU();
 }
 

buildroot/share/tests/megaatmega2560-tests

 #
 restore_configs
 opt_set LCD_LANGUAGE zh_CN
+opt_set EXTRUDERS 5
 opt_set NUM_SERVOS 1
 opt_enable ZONESTAR_LCD Z_PROBE_SERVO_NR Z_SERVO_ANGLES DEACTIVATE_SERVOS_AFTER_MOVE BOOT_MARLIN_LOGO_ANIMATED \
            AUTO_BED_LEVELING_3POINT DEBUG_LEVELING_FEATURE EEPROM_SETTINGS EEPROM_CHITCHAT M114_DETAIL \
-           NO_VOLUMETRICS EXTENDED_CAPABILITIES_REPORT AUTO_REPORT_TEMPERATURES AUTOTEMP G38_PROBE_TARGET JOYSTICK
-exec_test $1 $2 "RAMPS | ZONESTAR_LCD | Servo Probe | ABL 3-Pt | Debug Leveling | EEPROM | G38 ..."
+           NO_VOLUMETRICS EXTENDED_CAPABILITIES_REPORT AUTO_REPORT_TEMPERATURES AUTOTEMP G38_PROBE_TARGET JOYSTICK \
+           PRUSA_MMU2 MMU2_MENUS NOZZLE_PARK_FEATURE ADVANCED_PAUSE_FEATURE
+exec_test $1 $2 "RAMPS | ZONESTAR_LCD | MMU2 | Servo Probe | ABL 3-Pt | Debug Leveling | EEPROM | G38 ..."
 
 #
 # Test MINIRAMBO with PWM_MOTOR_CURRENT and many features