Fix hero balance

Add tests for checking

tests/Core/HeroBalanceTest.ts

@@ -0,0 +1,34 @@
+import { it, describe } from 'mocha';
+import { expect } from 'chai';
+
+import { Resources, ResourceStorage, ResourceType } from '../../src/Game';
+import { Core } from '../../src/Core/HeroBalance';
+
+describe('HeroBalance', function() {
+    it('Get resource for requirement', function() {
+        const current = new Resources(100, 100, 100, 100);
+        const required = new Resources(200, 200, 400, 300);
+        const totalRequired = new Resources(200, 200, 400, 300);
+        const storage = new ResourceStorage(1000, 1000);
+        const heroRes = Core.calcHeroResource(current, required, totalRequired, storage);
+        expect(heroRes).to.equals(ResourceType.Iron);
+    });
+
+    it('Get resource if one is enough', function() {
+        const current = new Resources(100, 100, 100, 500);
+        const required = new Resources(200, 200, 400, 300);
+        const totalRequired = new Resources(200, 200, 400, 300);
+        const storage = new ResourceStorage(1000, 1000);
+        const heroRes = Core.calcHeroResource(current, required, totalRequired, storage);
+        expect(heroRes).to.equals(ResourceType.Iron);
+    });
+
+    it('Get resource if all are enough, but storage non optimal', function() {
+        const current = new Resources(600, 600, 500, 600);
+        const required = new Resources(100, 100, 100, 100);
+        const totalRequired = new Resources(100, 100, 100, 100);
+        const storage = new ResourceStorage(1000, 1000);
+        const heroRes = Core.calcHeroResource(current, required, totalRequired, storage);
+        expect(heroRes).to.equals(ResourceType.Iron);
+    });
+});