feat: make each plugin an npm workspace built by a termix-plugin CLI

plugins/host-metrics/tests/backend/metrics-shared/host-status.test.ts

@@ -0,0 +1,40 @@
+import { describe, expect, it } from "vitest";
+import {
+  isHostKeyVerificationError,
+  statusAfterAuthentication,
+  statusAfterReachabilityCheck,
+} from "../../../../../src/backend/hosts/metrics-shared/host-status.js";
+
+describe("isHostKeyVerificationError", () => {
+  it.each([
+    "Host denied (verification failed)",
+    "Host key changed - please connect via Terminal to verify the new key",
+  ])("classifies %s", (message) => {
+    expect(isHostKeyVerificationError(new Error(message))).toBe(true);
+  });
+
+  it("does not classify ordinary authentication failures", () => {
+    expect(isHostKeyVerificationError(new Error("Permission denied"))).toBe(
+      false,
+    );
+  });
+});
+
+describe("host availability status", () => {
+  it("does not call a TCP-reachable host online before authentication", () => {
+    expect(statusAfterReachabilityCheck(true)).toBe("reachable");
+  });
+
+  it("keeps a verified host online across later reachability checks", () => {
+    expect(statusAfterReachabilityCheck(true, "online")).toBe("online");
+  });
+
+  it("marks successful authentication online", () => {
+    expect(statusAfterAuthentication(true, "reachable")).toBe("online");
+  });
+
+  it("downgrades failed authentication without hiding reachability", () => {
+    expect(statusAfterAuthentication(false, "online")).toBe("reachable");
+    expect(statusAfterAuthentication(false, "offline")).toBe("offline");
+  });
+});