test: add infra coverage and fix web logging

src/infra/tailscale.test.ts

@@ -0,0 +1,61 @@
+import { describe, expect, it, vi } from "vitest";
+
+import {
+	getTailnetHostname,
+	ensureGoInstalled,
+	ensureTailscaledInstalled,
+} from "./tailscale.js";
+
+describe("tailscale helpers", () => {
+	it("parses DNS name from tailscale status", async () => {
+		const exec = vi.fn().mockResolvedValue({
+			stdout: JSON.stringify({
+				Self: { DNSName: "host.tailnet.ts.net.", TailscaleIPs: ["100.1.1.1"] },
+			}),
+		});
+		const host = await getTailnetHostname(exec);
+		expect(host).toBe("host.tailnet.ts.net");
+	});
+
+	it("falls back to IP when DNS missing", async () => {
+		const exec = vi.fn().mockResolvedValue({
+			stdout: JSON.stringify({ Self: { TailscaleIPs: ["100.2.2.2"] } }),
+		});
+		const host = await getTailnetHostname(exec);
+		expect(host).toBe("100.2.2.2");
+	});
+
+	it("ensureGoInstalled installs when missing and user agrees", async () => {
+		const exec = vi
+			.fn()
+			.mockRejectedValueOnce(new Error("no go"))
+			.mockResolvedValue({}); // brew install go
+		const prompt = vi.fn().mockResolvedValue(true);
+		const runtime = {
+			error: vi.fn(),
+			log: vi.fn(),
+			exit: ((code: number) => {
+				throw new Error(`exit ${code}`);
+			}) as (code: number) => never,
+		};
+		await ensureGoInstalled(exec as never, prompt, runtime);
+		expect(exec).toHaveBeenCalledWith("brew", ["install", "go"]);
+	});
+
+	it("ensureTailscaledInstalled installs when missing and user agrees", async () => {
+		const exec = vi
+			.fn()
+			.mockRejectedValueOnce(new Error("missing"))
+			.mockResolvedValue({});
+		const prompt = vi.fn().mockResolvedValue(true);
+		const runtime = {
+			error: vi.fn(),
+			log: vi.fn(),
+			exit: ((code: number) => {
+				throw new Error(`exit ${code}`);
+			}) as (code: number) => never,
+		};
+		await ensureTailscaledInstalled(exec as never, prompt, runtime);
+		expect(exec).toHaveBeenCalledWith("brew", ["install", "tailscale"]);
+	});
+});