Add CLI and infra test coverage

src/cli/wait.test.ts

@@ -0,0 +1,16 @@
+import { describe, expect, it, vi } from "vitest";
+
+import { waitForever } from "./wait.js";
+
+describe("waitForever", () => {
+	it("creates an unref'ed interval and returns a pending promise", () => {
+		const setIntervalSpy = vi.spyOn(global, "setInterval");
+		const promise = waitForever();
+		expect(setIntervalSpy).toHaveBeenCalledWith(
+			expect.any(Function),
+			1_000_000,
+		);
+		expect(promise).toBeInstanceOf(Promise);
+		setIntervalSpy.mockRestore();
+	});
+});