refactor: destroy ship_group item

internal/controller/ship_group_test.go

@@ -526,3 +526,16 @@ func TestDisassembleGroup(t *testing.T) {
 	assert.Equal(t, uint(7), c.ShipGroup(2).Number)
 	assert.Equal(t, 56.0, c.ShipGroup(2).Load.F())
 }
+
+func TestShipGroupDestroyItem(t *testing.T) {
+	c, _ := newCache()
+
+	assert.NoError(t, c.CreateShips(Race_0_idx, Race_0_Freighter, R0_Planet_0_num, 10))
+	c.ShipGroup(0).CargoType = game.CargoColonist.Ref()
+	c.ShipGroup(0).Load = 100.0
+
+	for c.ShipGroup(0).Number > 0 {
+		c.ShipGroupDestroyItem(0)
+		assert.Equal(t, float64(c.ShipGroup(0).Number)*10, c.ShipGroup(0).Load.F())
+	}
+}