restructure package, rename module/repo

ntp/ntp_test.go

@@ -0,0 +1,60 @@
+package ntp
+
+import (
+	"encoding/binary"
+	"testing"
+	"time"
+)
+
+func TestTimestamp(t *testing.T) {
+	now := time.Now()
+	nowp1 := now.Add(time.Second)
+	t1, err := TimestampFromTime(now)
+	if err != nil {
+		t.Fatal(err)
+	}
+	t2, _ := TimestampFromTime(nowp1)
+	gotnow := t1.Time()
+	if gotnow.Sub(now) > time.Microsecond {
+		t.Fatalf("got %v, want %v", gotnow, now)
+	}
+
+	d := t2.Sub(t1)
+	if d != time.Second {
+		t.Fatalf("expected 1s, got %s", d)
+	}
+	d = t1.Sub(t2)
+	if d != -time.Second {
+		t.Fatalf("expected -1s, got %s", d)
+	}
+
+	var b [8]byte
+	t1.Put(b[:])
+	readback := binary.BigEndian.Uint64(b[:])
+	t1got := TimestampFromUint64(readback)
+	if t1got != t1 {
+		t.Fatalf("got %v, want %v", t1got, t1)
+	}
+}
+
+func TestTimestampOverflow(t *testing.T) {
+	const tol = time.Microsecond
+	var now = time.Now() // time.Date(2035, 2, 7, 6, 28, 16, 0, time.UTC)
+	told, err := TimestampFromTime(baseTime)
+	if err != nil {
+		t.Fatal(err)
+	}
+	tmodern, err := TimestampFromTime(now)
+	if err != nil {
+		t.Fatal(err)
+	}
+	diff := tmodern.Sub(told)
+	if diff < 0 {
+		t.Fatalf("got %v, want positive", diff)
+	}
+	diffwant := now.Sub(baseTime)
+	differr := (diff - diffwant).Abs()
+	if differr > tol {
+		t.Fatalf("got diff %v", differr)
+	}
+}