feat: implement prepareSqlitePath function and add tests for database path handling

src/db/sqlitePath.test.ts

@@ -0,0 +1,23 @@
+import { mkdtemp, rm } from "node:fs/promises";
+import { existsSync } from "node:fs";
+import { join } from "node:path";
+import { tmpdir } from "node:os";
+import { describe, expect, test } from "bun:test";
+import { prepareSqlitePath } from "./sqlitePath";
+
+describe("prepareSqlitePath", () => {
+  test("creates parent directory for file database urls", async () => {
+    const root = await mkdtemp(join(tmpdir(), "booster-role-db-"));
+    const dbPath = join(root, "nested", "booster-role.sqlite");
+
+    expect(existsSync(join(root, "nested"))).toBe(false);
+    expect(prepareSqlitePath(`file:${dbPath}`)).toBe(dbPath);
+    expect(existsSync(join(root, "nested"))).toBe(true);
+
+    await rm(root, { recursive: true, force: true });
+  });
+
+  test("does not create a directory for in-memory databases", () => {
+    expect(prepareSqlitePath(":memory:")).toBe(":memory:");
+  });
+});