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1import type os from "node:os";
2import { describe, expect, it } from "vitest";
3import { createCpuLoadTracker, readCpuTimes } from "@/lib/server/modules/system/cpu-activity";
4
5function core(times: Partial<os.CpuInfo["times"]>): os.CpuInfo {
6  return { model: "cpu", speed: 1000, times: { user: 0, nice: 0, sys: 0, idle: 0, irq: 0, ...times } };
7}
8
9describe("cpu activity", () => {
10  it("sums busy and total time over all cores", () => {
11    const times = readCpuTimes([
12      core({ user: 100, nice: 10, sys: 50, irq: 5, idle: 835 }),
13      core({ user: 200, idle: 800 }),
14    ]);
15
16    expect(times).toEqual({ busyMs: 365, totalMs: 2000 });
17  });
18
19  it("turns two readings into a load percent", () => {
20    const track = createCpuLoadTracker();
21
22    expect(track({ busyMs: 1_000, totalMs: 10_000 })).toBeNull();
23    expect(track({ busyMs: 1_250, totalMs: 11_000 })).toBe(25);
24  });
25
26  it("gives no load when no time passed or counters went backwards", () => {
27    const track = createCpuLoadTracker();
28    track({ busyMs: 1_000, totalMs: 10_000 });
29
30    expect(track({ busyMs: 1_000, totalMs: 10_000 })).toBeNull();
31    expect(track({ busyMs: 500, totalMs: 12_000 })).toBeNull();
32  });
33});
34