Add draft te st and fix spanByRarity

src/mlpccg/database.ts

@@ -1,10 +1,10 @@
 import Dexie from "dexie";
-import { Card, CardFilter, StoredImages } from "./types";
+import { Card, CardFilter, StoredImage } from "./types";
 import { cardFullName } from "./card";
 
 class CardDatabase extends Dexie {
   public cards: Dexie.Table<Card, string>;
-  public images: Dexie.Table<StoredImages, string>;
+  public images: Dexie.Table<StoredImage, string>;
 
   public constructor() {
     super("CardDatabase");
@@ -20,7 +20,9 @@ class CardDatabase extends Dexie {
 export let Database: CardDatabase | null = null;
 
 export function initDB() {
-  Database = new CardDatabase();
+  if (Database == null) {
+    Database = new CardDatabase();
+  }
 }
 
 export async function getCards(filter: CardFilter) {
@@ -153,6 +155,9 @@ export async function getCards(filter: CardFilter) {
 }
 
 export async function cardFromIDs(cardIDs: string[]): Promise<Card[]> {
+  if (Database == null) {
+    throw new Error("Database was not initialized, init with 'initDB()'");
+  }
   let table = Database.cards;
   //TODO Replace with .bulkGet when upgrading to Dexie 3.x
   return await table

src/mlpccg/draft/booster.ts

@@ -192,7 +192,7 @@ export class PackBuilder {
 }
 
 // Yields random cards from a chosen pool
-function* randomProvider(pool: Card[]) {
+export function* randomProvider(pool: Card[]) {
   while (true) {
     const idx = Math.floor(Math.random() * pool.length);
     yield pool[idx];
@@ -201,12 +201,12 @@ function* randomProvider(pool: Card[]) {
 
 // Divides a list of card to a map of rarities
 // ie. [ff14, ff16, ff17] => { "C" : ["ff14"], "U": ["ff17"], "R": ["ff16"] }
-function spanByRarity(pool: Card[]): Record<string, Card[]> {
+export function spanByRarity(pool: Card[]): Record<string, Card[]> {
   return pool.reduce((map, current) => {
     if (!(current.Rarity in map)) {
       map[current.Rarity] = [];
     }
-    map[current.Rarity] = current;
+    map[current.Rarity].push(current);
     return map;
   }, Object.create(null));
 }

src/mlpccg/draft/index.ts

@@ -0,0 +1,3 @@
+export * from "./cube";
+export * from "./booster";
+export * from "./types";

src/mlpccg/types.ts

@@ -2,7 +2,7 @@ export type Rarity = "C" | "U" | "R" | "SR" | "UR" | "RR";
 
 export type PowerRequirement = { [key: string]: number };
 
-export interface StoredImages {
+export interface StoredImage {
   id: string;
   image: Blob;
 }

src/testing/IDBShim.ts

@@ -0,0 +1,11 @@
+import Dexie from "dexie";
+
+let init = false;
+
+export function setupIDBShim() {
+  if (!init) {
+    const setGlobalVars = require("indexeddbshim");
+    setGlobalVars(Dexie.dependencies);
+    init = true;
+  }
+}

src/tests/unit/database.spec.ts

@@ -1,7 +1,7 @@
 import { loadSets, getCards, Database, initDB, cardFullName } from "@/mlpccg";
-import Dexie from "dexie";
-const setGlobalVars = require("indexeddbshim");
-setGlobalVars(Dexie.dependencies);
+import { setupIDBShim } from "@/testing/IDBShim";
+
+setupIDBShim();
 
 describe("mlpccg/Database", () => {
   beforeAll(async () => {

src/tests/unit/draft.spec.ts

@@ -0,0 +1,25 @@
+import { setupIDBShim } from "@/testing/IDBShim";
+import { initDB, loadSets, Database } from "@/mlpccg";
+import { PackBuilder, spanByRarity } from "@/mlpccg/draft";
+
+setupIDBShim();
+
+describe("mlpccg/draft", () => {
+  beforeAll(async () => {
+    jest.setTimeout(15000);
+    initDB();
+    await loadSets();
+  });
+
+  test("Set booster packs are generated correctly", async () => {
+    expect(Database).toBeTruthy();
+    const builder = await PackBuilder.fromSet("FF");
+    const pack = builder.buildPack();
+    // Check pack size
+    expect(pack).toHaveLength(12);
+    const rarities = spanByRarity(pack);
+    // Check pack distribution
+    expect(rarities["R"]).toHaveLength(1);
+    expect(rarities["U"]).toHaveLength(3);
+  });
+});