adrien
71dad18e8d
Central banks now redeem the national money foreign banks hold, sell reserves to defend a weak rate, and cover part of strategic imports from reserves. Five repeatable technologies raise each commodity's output per unit of energy. Hostile troops on a road or sea lane sever trade, power and unit supply. Middlemen buy food to resell to neighbours at a markup, and starving regions buy before those topping up their buffers, which clears the landlocked famines. The economic map's trade graph gains a colour legend.
44 lines
1.8 KiB
JavaScript
44 lines
1.8 KiB
JavaScript
import { TestCase } from "./framework/test_case.js";
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import { smallState, cityOf } from "./framework/helpers.js";
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import { RESOURCE_IDS, MIDDLEMAN } from "../shared/data.js";
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import { foodNeedPerDay } from "../shared/resources.js";
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export class FoodSecurityTest extends TestCase {
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test_starving_regions_buy_before_stocked_ones() {
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const state = smallState();
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const cities = state.cities.filter((city) => city.civ === 0);
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this.assertGreater(cities.length, 1, "the fixture has two regions");
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const starving = cities[0];
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const stocked = cities[1];
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state.getCityResourceStock(starving).food = 0;
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state.getCityResourceStock(stocked).food =
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foodNeedPerDay(state.getCityEconomy(stocked).population) * 5;
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const order = [];
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const orig = state._procureFromNeighbours.bind(state);
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state._procureFromNeighbours = function (city, ...rest) {
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order.push(city.id);
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return orig(city, ...rest);
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};
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const market = new Map(RESOURCE_IDS.map((id) => [
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id, { supply: 0, demand: 0, price: state.getResourcePrice(id) },
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]));
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state._consumeCityResources(new Map(), market);
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this.assertEqual(order[0], starving.id, "the empty region buys first");
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}
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test_a_middleman_charges_a_margin_on_relayed_food() {
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const state = smallState();
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const city = cityOf(state, 0);
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state._relayStock.set(city.id, 100);
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const price = state.getResourcePrice("food");
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const supplier = { kind: "city", city };
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const markup = state._middlemanMarkup(supplier, "food", 60, price);
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this.assertApprox(markup, 60 * price * MIDDLEMAN.markup);
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this.assertApprox(state._relayStock.get(city.id), 40, 1e-9, "only the sold stock is drawn");
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this.assertEqual(
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state._middlemanMarkup(supplier, "steel", 10, price), 0,
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"only food carries the margin"
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);
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}
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}
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