package stats

import "testing"

func TestStubSystemCPUPercentFirstSampleZero(t *testing.T) {
	r := NewReporter()
	if got := r.stubSystemCPUPercent(); got != 0 {
		t.Fatalf("first sample want 0 got %v", got)
	}
}

func TestStubSystemCPUPercentFallbackBelowIdleThreshold(t *testing.T) {
	r := NewReporter()
	_ = r.stubSystemCPUPercent()
	got := r.stubSystemCPUPercent()
	if got != StubFallbackCPUPercent {
		t.Fatalf("fallback want %v got %v", StubFallbackCPUPercent, got)
	}
	if got >= 20 {
		t.Fatalf("fallback %v must stay below default idle threshold 20", got)
	}
}

func TestStubSystemCPUPercentSubsequentNonZero(t *testing.T) {
	r := NewReporter()
	_ = r.stubSystemCPUPercent()
	if got := r.stubSystemCPUPercent(); got <= 0 {
		t.Fatalf("subsequent stub sample must be >0 for idle guard, got %v", got)
	}
}