Add CLI and infra test coverage

src/infra/binaries.test.ts

@@ -0,0 +1,38 @@
+import { describe, expect, it, vi } from "vitest";
+
+import type { runExec } from "../process/exec.js";
+import type { RuntimeEnv } from "../runtime.js";
+import { ensureBinary } from "./binaries.js";
+
+describe("ensureBinary", () => {
+	it("passes through when binary exists", async () => {
+		const exec: typeof runExec = vi.fn().mockResolvedValue({
+			stdout: "",
+			stderr: "",
+		});
+		const runtime: RuntimeEnv = {
+			log: vi.fn(),
+			error: vi.fn(),
+			exit: vi.fn(),
+		};
+		await ensureBinary("node", exec, runtime);
+		expect(exec).toHaveBeenCalledWith("which", ["node"]);
+	});
+
+	it("logs and exits when missing", async () => {
+		const exec: typeof runExec = vi
+			.fn()
+			.mockRejectedValue(new Error("missing"));
+		const error = vi.fn();
+		const exit = vi.fn(() => {
+			throw new Error("exit");
+		});
+		await expect(
+			ensureBinary("ghost", exec, { log: vi.fn(), error, exit }),
+		).rejects.toThrow("exit");
+		expect(error).toHaveBeenCalledWith(
+			"Missing required binary: ghost. Please install it.",
+		);
+		expect(exit).toHaveBeenCalledWith(1);
+	});
+});