Verify random battle and capture routines against the original engine

tests/reference-fixture.ts

@@ -0,0 +1,48 @@
+import type { Page } from "@playwright/test";
+import { readFileSync } from "node:fs";
+import { resolve } from "node:path";
+
+export const romPath = resolve(
+  process.env.CRYSTAL_ROM_PATH ??
+    "Pokemon - Crystal Version (UE) (V1.1) [C][!].gbc",
+);
+export const symbolsPath = ".reference/pokecrystal/pokecrystal11.sym";
+
+/** Banked addresses from the private PRET rebuild's symbol file. */
+export function loadSymbols() {
+  const symbols = new Map(
+    readFileSync(symbolsPath, "utf8")
+      .split("\n")
+      .flatMap((line) => {
+        const match = /^([0-9a-f]{2}):([0-9a-f]{4}) (\S+)$/.exec(line);
+        return match
+          ? [
+              [
+                match[3],
+                {
+                  bank: parseInt(match[1], 16),
+                  address: parseInt(match[2], 16),
+                },
+              ] as const,
+            ]
+          : [];
+      }),
+  );
+  return {
+    at: (name: string) => symbols.get(name)!.address,
+    routine: (name: string) => symbols.get(name)!,
+  };
+}
+
+/** Open the reference page and hand it the ROM through an isolated file
+ * input, without an HTTP ROM endpoint. */
+export async function openReference(page: Page) {
+  await page.goto("/reference.html");
+  await page.evaluate(() => {
+    const input = document.createElement("input");
+    input.type = "file";
+    input.id = "reference-fixture";
+    document.body.append(input);
+  });
+  await page.locator("#reference-fixture").setInputFiles(romPath);
+}