first commit

packages/db/test/registry.test.ts

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+import { test, expect } from "bun:test";
+import {
+  createDb,
+  setDb,
+  getDb,
+  hasDb,
+  registerDb,
+  databaseNames,
+  closeDatabases,
+} from "../src/index.ts";
+import { sqlite } from "../src/adapters/sqlite.ts";
+
+test("multi-database registry: default + named connections", async () => {
+  await closeDatabases(); // isolate from any prior state
+
+  const main = createDb(sqlite(":memory:"));
+  const analytics = createDb(sqlite(":memory:"));
+
+  setDb(main); // default
+  registerDb("analytics", analytics); // named
+
+  expect(getDb()).toBe(main);
+  expect(getDb("analytics")).toBe(analytics);
+  expect(hasDb()).toBe(true);
+  expect(hasDb("analytics")).toBe(true);
+  expect(hasDb("missing")).toBe(false);
+  expect(databaseNames().sort()).toEqual(["analytics", "default"]);
+
+  // Each connection is independent — a table in one is not in the other.
+  await main.exec("CREATE TABLE a (id INTEGER)");
+  await analytics.exec("CREATE TABLE b (id INTEGER)");
+  await getDb().exec("INSERT INTO a (id) VALUES (1)");
+  await getDb("analytics").exec("INSERT INTO b (id) VALUES (2)");
+  expect((await getDb().all("SELECT id FROM a")).length).toBe(1);
+  expect((await getDb("analytics").all("SELECT id FROM b")).length).toBe(1);
+
+  await closeDatabases();
+  expect(hasDb()).toBe(false);
+  expect(databaseNames()).toEqual([]);
+});
+
+test("getDb throws a helpful error for an unknown named database", async () => {
+  await closeDatabases();
+  setDb(createDb(sqlite(":memory:")));
+  expect(() => getDb("nope")).toThrow(/No database named 'nope'/);
+  await closeDatabases();
+});