refactor: register gateway service adapters

src/daemon/service.test.ts

@@ -0,0 +1,40 @@
+import { afterEach, describe, expect, it } from "vitest";
+import { resolveGatewayService } from "./service.js";
+
+const originalPlatformDescriptor = Object.getOwnPropertyDescriptor(process, "platform");
+
+function setPlatform(value: NodeJS.Platform | "aix") {
+  if (!originalPlatformDescriptor) {
+    throw new Error("missing process.platform descriptor");
+  }
+  Object.defineProperty(process, "platform", {
+    configurable: true,
+    enumerable: originalPlatformDescriptor.enumerable ?? false,
+    value,
+  });
+}
+
+afterEach(() => {
+  if (!originalPlatformDescriptor) {
+    return;
+  }
+  Object.defineProperty(process, "platform", originalPlatformDescriptor);
+});
+
+describe("resolveGatewayService", () => {
+  it.each([
+    { platform: "darwin" as const, label: "LaunchAgent", loadedText: "loaded" },
+    { platform: "linux" as const, label: "systemd", loadedText: "enabled" },
+    { platform: "win32" as const, label: "Scheduled Task", loadedText: "registered" },
+  ])("returns the registered adapter for $platform", ({ platform, label, loadedText }) => {
+    setPlatform(platform);
+    const service = resolveGatewayService();
+    expect(service.label).toBe(label);
+    expect(service.loadedText).toBe(loadedText);
+  });
+
+  it("throws for unsupported platforms", () => {
+    setPlatform("aix");
+    expect(() => resolveGatewayService()).toThrow("Gateway service install not supported on aix");
+  });
+});