feat: convert file manager into a plugin

plugins/file-manager/tests/backend/helpers.ts

@@ -0,0 +1,91 @@
+import http from "node:http";
+import type { AddressInfo } from "node:net";
+import { fileURLToPath } from "node:url";
+import express, { type Router } from "express";
+import {
+  createMockCtx,
+  createTestDb,
+  type MockPluginContext,
+  type TestDb,
+} from "@termix/plugin-sdk/testing";
+import type { PluginManifest } from "@termix/plugin-sdk/manifest";
+import manifestJson from "../../manifest.json";
+
+export const pluginDir = fileURLToPath(new URL("../..", import.meta.url));
+export const manifest = manifestJson as unknown as PluginManifest;
+
+export interface TestServer {
+  db: TestDb;
+  mock: MockPluginContext;
+  request: (
+    method: string,
+    path: string,
+    options?: { user?: string; body?: unknown },
+    // Route bodies vary per test; asserting on them is the point.
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  ) => Promise<{ status: number; body: any }>;
+  close: () => Promise<void>;
+}
+
+/**
+ * The plugin activated against a real in-memory database, its router mounted
+ * on an express app the way core mounts it: JSON parsed, the acting user set
+ * from the request, everything else left to the plugin.
+ */
+export async function startServer(
+  options: { permissions?: string[]; users?: string[] } = {},
+): Promise<TestServer> {
+  const db = await createTestDb(pluginDir);
+  for (const user of options.users ?? ["user-1", "user-2"]) {
+    db.sqlite
+      .prepare("INSERT INTO users (id, username) VALUES (?, ?)")
+      .run(user, user);
+  }
+
+  let router: Router | null = null;
+  const mock = createMockCtx({
+    pluginId: manifest.id,
+    manifest,
+    capabilities: manifest.capabilities,
+    db: db.database,
+    router: () => (router = express.Router()),
+    permissions: options.permissions ?? ["file-manager.use"],
+  });
+
+  const { activate } = await import("../../src/backend/index.js");
+  await activate(mock.ctx);
+
+  const app = express();
+  app.use(express.json());
+  app.use((req, _res, next) => {
+    mock.setActor(req.header("x-test-user") ?? undefined);
+    next();
+  });
+  app.use((req, res, next) => router!(req, res, next));
+
+  const server = http.createServer(app);
+  await new Promise<void>((resolve) => server.listen(0, resolve));
+  const { port } = server.address() as AddressInfo;
+
+  return {
+    db,
+    mock,
+    async request(method, path, { user = "user-1", body: given } = {}) {
+      const body = method === "GET" ? undefined : given;
+      const response = await fetch(`http://127.0.0.1:${port}${path}`, {
+        method,
+        headers: {
+          "x-test-user": user,
+          ...(body !== undefined ? { "content-type": "application/json" } : {}),
+        },
+        body: body !== undefined ? JSON.stringify(body) : undefined,
+      });
+      const text = await response.text();
+      return { status: response.status, body: text ? JSON.parse(text) : null };
+    },
+    async close() {
+      await new Promise<void>((resolve) => server.close(() => resolve()));
+      db.close();
+    },
+  };
+}