nmon/internal/clock/clock_test.go

package clock

import (
	"testing"
	"time"
)

func TestFakeAdvanceFiresInOrder(t *testing.T) {
	f := NewFake(time.Unix(0, 0))
	a := f.After(2 * time.Second)
	tk := f.NewTicker(time.Second)
	defer tk.Stop()
	f.Advance(1500 * time.Millisecond)
	select {
	case <-tk.C():
	default:
		t.Fatal("ticker should have fired at 1s")
	}
	select {
	case <-a:
		t.Fatal("After(2s) fired early")
	default:
	}
	f.Advance(time.Second)
	if got := <-a; !got.Equal(time.Unix(2, 0)) {
		t.Fatalf("After fired at %v", got)
	}
	if !f.Now().Equal(time.Unix(2, 500_000_000)) {
		t.Fatalf("now = %v", f.Now())
	}
}