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diff --git a/src/features/workspaces/logic/view-model.test.ts b/src/features/workspaces/logic/view-model.test.ts
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+++ b/src/features/workspaces/logic/view-model.test.ts
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+import type { WorkspaceEntry } from "@dispatch/wire";
+import { describe, expect, it } from "vitest";
+import { applyStarred, pageTitle, relativeTime, sortWorkspaces } from "./view-model";
+
+describe("relativeTime", () => {
+  const now = 1_000_000_000_000; // 2001-09-09
+
+  it("is 'now' within a minute", () => {
+    expect(relativeTime(now, now)).toBe("now");
+    expect(relativeTime(now - 59_000, now)).toBe("now");
+  });
+
+  it("is minutes under an hour", () => {
+    expect(relativeTime(now - 5 * 60_000, now)).toBe("5m");
+    expect(relativeTime(now - 59 * 60_000, now)).toBe("59m");
+  });
+
+  it("is hours under a day", () => {
+    expect(relativeTime(now - 2 * 60 * 60_000, now)).toBe("2h");
+  });
+
+  it("is days under a week", () => {
+    expect(relativeTime(now - 3 * 24 * 60 * 60_000, now)).toBe("3d");
+  });
+
+  it("is a short date beyond a week", () => {
+    // 7+ days ago: just check it is a MM/DD string.
+    const s = relativeTime(now - 10 * 24 * 60 * 60_000, now);
+    expect(s).toMatch(/^\d{2}\/\d{2}$/);
+  });
+});
+
+describe("pageTitle", () => {
+  // Minimal valid WorkspaceEntry (the irrelevant metadata is zeroed).
+  const ws = (id: string, title: string): WorkspaceEntry => ({
+    id,
+    title,
+    defaultCwd: null,
+    defaultComputerId: null,
+    starred: false,
+    createdAt: 0,
+    lastActivityAt: 0,
+    conversationCount: 0,
+  });
+
+  it("is 'Dispatch' for the home route", () => {
+    expect(pageTitle({ kind: "home" }, [])).toBe("Dispatch");
+    expect(pageTitle({ kind: "home" }, [ws("default", "Default")])).toBe("Dispatch");
+  });
+
+  it("is 'Dispatch: {title}' for a workspace with a display title", () => {
+    const list = [ws("default", "Default"), ws("my-ws", "My Workspace")];
+    expect(pageTitle({ kind: "workspace", id: "my-ws" }, list)).toBe("Dispatch: My Workspace");
+  });
+
+  it("falls back to the slug (id) until the list has loaded the workspace", () => {
+    expect(pageTitle({ kind: "workspace", id: "pending" }, [])).toBe("Dispatch: pending");
+  });
+
+  it("uses the id as the title when it was never customized (defaults to id)", () => {
+    const list = [ws("default", "default")];
+    expect(pageTitle({ kind: "workspace", id: "default" }, list)).toBe("Dispatch: default");
+  });
+
+  it("matches by id, not title", () => {
+    const list = [ws("a", "shared-title"), ws("b", "shared-title")];
+    expect(pageTitle({ kind: "workspace", id: "b" }, list)).toBe("Dispatch: shared-title");
+  });
+});
+
+describe("sortWorkspaces", () => {
+  const entry = (id: string, starred: boolean, lastActivityAt: number): WorkspaceEntry => ({
+    id,
+    title: id,
+    defaultCwd: null,
+    defaultComputerId: null,
+    starred,
+    createdAt: 0,
+    lastActivityAt,
+    conversationCount: 0,
+  });
+
+  it("puts starred workspaces before unstarred", () => {
+    const list = [entry("plain", false, 9_000), entry("star", true, 1_000)];
+    expect(sortWorkspaces(list).map((w) => w.id)).toEqual(["star", "plain"]);
+  });
+
+  it("within the starred group, sorts by lastActivityAt desc", () => {
+    const list = [
+      entry("old-star", true, 1_000),
+      entry("new-star", true, 5_000),
+      entry("plain", false, 9_000),
+    ];
+    expect(sortWorkspaces(list).map((w) => w.id)).toEqual(["new-star", "old-star", "plain"]);
+  });
+
+  it("within the unstarred group, sorts by lastActivityAt desc", () => {
+    const list = [
+      entry("star", true, 1_000),
+      entry("old-plain", false, 1_000),
+      entry("new-plain", false, 5_000),
+    ];
+    expect(sortWorkspaces(list).map((w) => w.id)).toEqual(["star", "new-plain", "old-plain"]);
+  });
+
+  it("returns a new array (does not mutate the input)", () => {
+    const list = [entry("plain", false, 9_000), entry("star", true, 1_000)];
+    const sorted = sortWorkspaces(list);
+    expect(sorted).not.toBe(list);
+    // Input order is preserved (not mutated).
+    expect(list.map((w) => w.id)).toEqual(["plain", "star"]);
+    expect(sorted.map((w) => w.id)).toEqual(["star", "plain"]);
+  });
+
+  it("handles an empty list", () => {
+    expect(sortWorkspaces([])).toEqual([]);
+  });
+
+  it("is stable for equal lastActivityAt within a group", () => {
+    const list = [
+      entry("first", false, 5_000),
+      entry("second", false, 5_000),
+      entry("third", false, 5_000),
+    ];
+    expect(sortWorkspaces(list).map((w) => w.id)).toEqual(["first", "second", "third"]);
+  });
+});
+
+describe("applyStarred", () => {
+  const entry = (id: string, starred: boolean): WorkspaceEntry => ({
+    id,
+    title: id,
+    defaultCwd: null,
+    defaultComputerId: null,
+    starred,
+    createdAt: 0,
+    lastActivityAt: 0,
+    conversationCount: 0,
+  });
+
+  it("sets the named workspace's starred flag", () => {
+    const list = [entry("a", false), entry("b", false)];
+    const next = applyStarred(list, "b", true);
+    expect(next.map((w) => [w.id, w.starred])).toEqual([
+      ["a", false],
+      ["b", true],
+    ]);
+  });
+
+  it("returns a new array (does not mutate the input)", () => {
+    const list = [entry("a", false)];
+    const next = applyStarred(list, "a", true);
+    expect(next).not.toBe(list);
+    expect(list[0]?.starred).toBe(false);
+    expect(next[0]?.starred).toBe(true);
+  });
+
+  it("leaves other entries referentially unchanged (only the target is replaced)", () => {
+    const a = entry("a", false);
+    const b = entry("b", false);
+    const next = applyStarred([a, b], "b", true);
+    expect(next[0]).toBe(a);
+    expect(next[1]).not.toBe(b);
+  });
+
+  it("leaves the list unchanged when the id is absent (not yet loaded)", () => {
+    const list = [entry("a", false)];
+    const next = applyStarred(list, "missing", true);
+    expect(next.map((w) => [w.id, w.starred])).toEqual([["a", false]]);
+  });
+
+  it("can revert by re-applying the previous value", () => {
+    const list = [entry("a", false)];
+    const optimistic = applyStarred(list, "a", true);
+    expect(optimistic[0]?.starred).toBe(true);
+    const reverted = applyStarred(optimistic, "a", false);
+    expect(reverted[0]?.starred).toBe(false);
+  });
+});