Add command "charge" to charge up the rover's energy store

pkg/game/command.go

@@ -9,6 +9,9 @@ const (
 
 	// CommandRepair Will attempt to repair the rover with an inventory object
 	CommandRepair = "repair"
+
+	// CommandCharge Will use one tick to charge the rover
+	CommandCharge = "charge"
 )
 
 // Command represends a single command to execute

pkg/game/command_test.go

@@ -32,3 +32,38 @@ func TestCommand_Move(t *testing.T) {
 	pos.Add(vector.Vector{X: 0.0, Y: 1})
 	assert.Equal(t, pos, newPos, "Failed to correctly set position for rover")
 }
+
+func TestCommand_Charge(t *testing.T) {
+	world := NewWorld(8)
+	a, err := world.SpawnRover()
+	assert.NoError(t, err)
+	pos := vector.Vector{
+		X: 1.0,
+		Y: 2.0,
+	}
+
+	err = world.WarpRover(a, pos)
+	assert.NoError(t, err, "Failed to set position for rover")
+
+	// Move to use up some charge
+	moveCommand := Command{Command: CommandMove, Bearing: "N"}
+	assert.NoError(t, world.Enqueue(a, moveCommand), "Failed to queue move command")
+
+	// Tick the world
+	world.EnqueueAllIncoming()
+	world.ExecuteCommandQueues()
+
+	rover, _ := world.GetRover(a)
+	assert.Equal(t, rover.MaximumCharge-1, rover.Charge)
+
+	chargeCommand := Command{Command: CommandCharge}
+	assert.NoError(t, world.Enqueue(a, chargeCommand), "Failed to queue charge command")
+
+	// Tick the world
+	world.EnqueueAllIncoming()
+	world.ExecuteCommandQueues()
+
+	rover, _ = world.GetRover(a)
+	assert.Equal(t, rover.MaximumCharge, rover.Charge)
+
+}

pkg/game/world.go

@@ -371,6 +371,7 @@ func (w *World) Enqueue(rover string, commands ...Command) error {
 			}
 		case CommandStash:
 		case CommandRepair:
+		case CommandCharge:
 			// Nothing to verify
 		default:
 			return fmt.Errorf("unknown command: %s", c.Command)
@@ -458,6 +459,11 @@ func (w *World) ExecuteCommand(c *Command, rover string) (err error) {
 			r.Integrity = r.Integrity + 1
 			w.Rovers[rover] = r
 		}
+	case CommandCharge:
+		_, err := w.ChargeRover(rover)
+		if err != nil {
+			return err
+		}
 	default:
 		return fmt.Errorf("unknown command: %s", c.Command)
 	}

proto/rove/rove.proto

@@ -65,6 +65,7 @@ message Command {
     // "move" - Move the rover in a direction, requires bearing
     // "stash" - Stashes item at current location in rover inventory
     // "repair" - Repairs the rover using an inventory object
+    // "charge" - Waits a tick to add more charge to the rover
     string command = 1;
 
     // The bearing, example: NE