Add context data tests for @fedify/elysia

This commit includes the following changes:

- Added two tests with a minimal fake federation: fedify() calls the
  context data factory when handling a request, and the factory's
  return value reaches federation.fetch() as its contextData option.
- Added the test and test:bun scripts to package.json because
  `mise run test-each elysia` did not pick up the new tests without
  them.  The tests now run on Node.js and Bun, the runtimes Elysia
  targets.

Assisted-by: Claude Code:claude-fable-5

Author: dktsudgg

packages/elysia/package.json

@@ -46,7 +46,9 @@
     "build:self": "tsdown",
     "build": "pnpm --filter @fedify/elysia... run build:self",
     "prepack": "pnpm build",
-    "prepublish": "pnpm build"
+    "prepublish": "pnpm build",
+    "test": "node --experimental-transform-types --test",
+    "test:bun": "bun test src/"
   },
   "peerDependencies": {
     "elysia": "^1.3.6",

packages/elysia/src/index.test.ts

@@ -0,0 +1,49 @@
+import { Elysia } from "elysia";
+import { strict as assert } from "node:assert";
+import { describe, test } from "node:test";
+import { fedify } from "./index.ts";
+
+interface MockFederation {
+  fetch(request: Request, options: unknown): Promise<Response>;
+}
+
+describe("[elysia] fedify() plugin", () => {
+  test("fedify() calls the context data factory when handling a request", async () => {
+    const elysia = new Elysia();
+    const mockFederation: MockFederation = {
+      fetch: () => Promise.resolve(new Response("OK")),
+    };
+    let count = 0;
+    const mockContextDataFactory = () => {
+      // increases count if this method called
+      count++;
+    };
+
+    elysia.use(fedify(mockFederation as never, mockContextDataFactory));
+    await elysia.handle(new Request("http://localhost/"));
+
+    assert.strictEqual(count, 1, "the context data factory must be called");
+  });
+
+  test("fedify() calls federation.fetch() with the context data", async () => {
+    const elysia = new Elysia();
+    const mockFederation: MockFederation = {
+      fetch: (_req, opts) => {
+        // return context data
+        const contextData = (opts as { contextData: string }).contextData;
+        return Promise.resolve(new Response(contextData));
+      },
+    };
+    const mockContextDataFactory = () => "Hello World";
+
+    elysia.use(fedify(mockFederation as never, mockContextDataFactory));
+    const actual = await elysia.handle(new Request("http://localhost/"))
+      .then((res) => res.text());
+
+    assert.strictEqual(
+      actual,
+      "Hello World",
+      "federation.fetch() must receive the context data returned by the factory",
+    );
+  });
+});