Add support for fusing/unfusing JellyLMS zones into synchronized

multi-room groups, addressed by MAC (derived from the `lms-{mac}` device id).

src/lib/stores/lmsSync.test.ts

@@ -0,0 +1,91 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { get } from "svelte/store";
+import type { Session } from "$lib/api/types";
+
+const mockInvoke = vi.fn();
+vi.mock("$lib/api/bindings", () => ({
+  commands: {
+    lmsGetSyncGroups: () => mockInvoke("lms_get_sync_groups"),
+    lmsCreateSyncGroup: (masterMac: string, slaveMacs: string[]) =>
+      mockInvoke("lms_create_sync_group", { masterMac, slaveMacs }),
+    lmsUnsyncPlayer: (mac: string) => mockInvoke("lms_unsync_player", { mac }),
+    lmsDissolveSyncGroup: (masterMac: string) =>
+      mockInvoke("lms_dissolve_sync_group", { masterMac }),
+  },
+}));
+
+import { lmsSync, isLmsSession, macForSession } from "./lmsSync";
+
+function session(deviceId: string | null): Session {
+  return { id: "s", deviceId } as unknown as Session;
+}
+
+describe("LMS session detection", () => {
+  it("detects LMS zones by the lms- device-id prefix", () => {
+    expect(isLmsSession(session("lms-aa:bb:cc:dd:ee:ff"))).toBe(true);
+    expect(isLmsSession(session("chromecast-123"))).toBe(false);
+    expect(isLmsSession(session(null))).toBe(false);
+    expect(isLmsSession(null)).toBe(false);
+  });
+
+  it("recovers the MAC from an LMS session, null otherwise", () => {
+    expect(macForSession(session("lms-aa:bb:cc:dd:ee:ff"))).toBe("aa:bb:cc:dd:ee:ff");
+    expect(macForSession(session("web-xyz"))).toBeNull();
+    expect(macForSession(null)).toBeNull();
+  });
+});
+
+describe("lmsSync store", () => {
+  beforeEach(() => {
+    mockInvoke.mockReset();
+    lmsSync.reset();
+  });
+
+  it("fusing preserves existing slaves and adds the new zone", async () => {
+    // Initial group: master M with slave A.
+    mockInvoke.mockResolvedValueOnce([{ masterMac: "M", masterName: "M", slaveMacs: ["A"], slaveNames: [] }]);
+    await lmsSync.refresh();
+
+    // create returns void; refresh after returns the updated group.
+    mockInvoke.mockResolvedValueOnce(undefined);
+    mockInvoke.mockResolvedValueOnce([{ masterMac: "M", masterName: "M", slaveMacs: ["A", "B"], slaveNames: [] }]);
+
+    await lmsSync.fuseZone("M", "B");
+
+    expect(mockInvoke).toHaveBeenCalledWith("lms_create_sync_group", {
+      masterMac: "M",
+      slaveMacs: ["A", "B"],
+    });
+    expect(get(lmsSync).groups[0].slaveMacs).toEqual(["A", "B"]);
+  });
+
+  it("decoupling a slave unsyncs just that player", async () => {
+    mockInvoke.mockResolvedValueOnce([{ masterMac: "M", masterName: "M", slaveMacs: ["A"], slaveNames: [] }]);
+    await lmsSync.refresh();
+
+    mockInvoke.mockResolvedValueOnce(undefined); // unsync
+    mockInvoke.mockResolvedValueOnce([{ masterMac: "M", masterName: "M", slaveMacs: [], slaveNames: [] }]);
+
+    await lmsSync.decoupleZone("A");
+
+    expect(mockInvoke).toHaveBeenCalledWith("lms_unsync_player", { mac: "A" });
+  });
+
+  it("decoupling the master dissolves the whole group", async () => {
+    mockInvoke.mockResolvedValueOnce([{ masterMac: "M", masterName: "M", slaveMacs: ["A"], slaveNames: [] }]);
+    await lmsSync.refresh();
+
+    mockInvoke.mockResolvedValueOnce(undefined); // dissolve
+    mockInvoke.mockResolvedValueOnce([]);
+
+    await lmsSync.decoupleZone("M");
+
+    expect(mockInvoke).toHaveBeenCalledWith("lms_dissolve_sync_group", { masterMac: "M" });
+  });
+
+  it("treats a missing plugin (refresh error) as no groups, not fatal", async () => {
+    mockInvoke.mockRejectedValueOnce(new Error("404"));
+    await lmsSync.refresh();
+    expect(get(lmsSync).groups).toEqual([]);
+  });
+});