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package ksuid
import (
"encoding/binary"
"math"
"testing"
)
func TestSequence(t *testing.T) {
seq := Sequence{Seed: New()}
if min, max := seq.Bounds(); min == max {
t.Error("min and max of KSUID range must differ when no ids have been generated")
}
for i := 0; i <= math.MaxUint16; i++ {
id, err := seq.Next()
if err != nil {
t.Fatal(err)
}
if j := int(binary.BigEndian.Uint16(id[len(id)-2:])); j != i {
t.Fatalf("expected %d but got %d in %s", i, j, id)
}
}
if _, err := seq.Next(); err == nil {
t.Fatal("no error returned after exhausting the id generator")
}
if min, max := seq.Bounds(); min != max {
t.Error("after all KSUIDs were generated the min and max must be equal")
}
}
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