verify seq is always unique

weed/sequence/snowflake_sequencer_test.go

@@ -0,0 +1,25 @@
+package sequence
+
+import (
+	"encoding/hex"
+	"github.com/chrislusf/seaweedfs/weed/storage/types"
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestSequencer(t *testing.T) {
+	seq, err := NewSnowflakeSequencer("for_test", 1)
+	assert.Equal(t, nil, err)
+	last := uint64(0)
+	bytes := make([]byte, types.NeedleIdSize)
+	for i := 0; i < 100; i++ {
+		next := seq.NextFileId(1)
+		types.NeedleIdToBytes(bytes, types.NeedleId(next))
+		println(hex.EncodeToString(bytes))
+		if last == next {
+			t.Errorf("last %d next %d", last, next)
+		}
+		last = next
+	}
+
+}