Fix execution workspace runtime lifecycle

server/src/__tests__/app-hmr-port.test.ts

@@ -0,0 +1,19 @@
+import { describe, expect, it } from "vitest";
+import { resolveViteHmrPort } from "../app.ts";
+
+describe("resolveViteHmrPort", () => {
+  it("uses serverPort + 10000 when the result stays in range", () => {
+    expect(resolveViteHmrPort(3100)).toBe(13_100);
+    expect(resolveViteHmrPort(55_535)).toBe(65_535);
+  });
+
+  it("falls back below the server port when adding 10000 would overflow", () => {
+    expect(resolveViteHmrPort(55_536)).toBe(45_536);
+    expect(resolveViteHmrPort(63_000)).toBe(53_000);
+  });
+
+  it("never returns a privileged or invalid port", () => {
+    expect(resolveViteHmrPort(65_535)).toBe(55_535);
+    expect(resolveViteHmrPort(9_000)).toBe(19_000);
+  });
+});