//go:build linux

package stats

import "testing"

func TestParseProcStatCPU(t *testing.T) {
	idle, total, ok := parseProcStatCPU("cpu  4705 0 1234 8123 45 0 12 0 0 0")
	if !ok {
		t.Fatal("expected ok")
	}
	if idle != 8123+45 {
		t.Fatalf("idle=%d", idle)
	}
	wantTotal := uint64(4705 + 0 + 1234 + 8123 + 45 + 0 + 12 + 0 + 0 + 0)
	if total != wantTotal {
		t.Fatalf("total=%d want %d", total, wantTotal)
	}
}

func TestParseProcStatCPUBadLine(t *testing.T) {
	if _, _, ok := parseProcStatCPU("meminfo"); ok {
		t.Fatal("expected false for non-cpu line")
	}
}

func TestSystemCPUPercentLinuxSecondSample(t *testing.T) {
	r := NewReporter()
	_ = r.SystemCPUPercent() // first sample seeds baseline
	pct := r.SystemCPUPercent()
	if pct < 0 || pct > 100 {
		t.Fatalf("cpu percent out of range: %v", pct)
	}
}