feat: add settings config UI

src/config.test.ts

@@ -0,0 +1,38 @@
+import { mkdtemp, readFile, rm, writeFile } from "node:fs/promises";
+import { join } from "node:path";
+import { tmpdir } from "node:os";
+import { afterEach, beforeEach, describe, expect, it } from "vitest";
+import { loadPiWebConfig, savePiWebConfig } from "./config.js";
+
+let tempDir: string;
+let configPath: string;
+
+beforeEach(async () => {
+  tempDir = await mkdtemp(join(tmpdir(), "pi-web-config-test-"));
+  configPath = join(tempDir, "config.json");
+});
+
+afterEach(async () => {
+  await rm(tempDir, { recursive: true, force: true });
+});
+
+describe("PI WEB config persistence", () => {
+  it("writes and reads the configured PI WEB config path", () => {
+    const saved = savePiWebConfig({ host: "0.0.0.0", port: 9000, allowedHosts: ["example.local"] }, testOptions());
+
+    expect(saved).toEqual({ path: configPath, exists: true, config: { host: "0.0.0.0", port: 9000, allowedHosts: ["example.local"] } });
+    expect(loadPiWebConfig(testOptions())).toEqual(saved);
+  });
+
+  it("preserves unrelated config keys while replacing managed keys", async () => {
+    await writeFile(configPath, `${JSON.stringify({ host: "old", port: 8504, allowedHosts: true, future: { enabled: true } }, null, 2)}\n`, "utf8");
+
+    savePiWebConfig({ port: 9000, allowedHosts: [] }, testOptions());
+
+    expect(JSON.parse(await readFile(configPath, "utf8"))).toEqual({ future: { enabled: true }, port: 9000, allowedHosts: [] });
+  });
+});
+
+function testOptions(): { env: NodeJS.ProcessEnv } {
+  return { env: { PI_WEB_CONFIG: configPath } };
+}