func TestPrefixLength(t *testing.T) {
list := samples
m := mockBackend{}
m.list = func(t backend.Type, done <-chan struct{}) <-chan string {
ch := make(chan string)
go func() {
defer close(ch)
for _, id := range list {
select {
case ch <- id.String():
case <-done:
return
}
}
}()
return ch
}
l, err := backend.PrefixLength(m, backend.Snapshot)
OK(t, err)
Equals(t, 19, l)
list = samples[:3]
l, err = backend.PrefixLength(m, backend.Snapshot)
OK(t, err)
Equals(t, 19, l)
list = samples[3:]
l, err = backend.PrefixLength(m, backend.Snapshot)
OK(t, err)
Equals(t, 8, l)
}
// PrefixLength returns the number of bytes required so that all prefixes of
// all IDs of type t are unique.
func (r *Repository) PrefixLength(t backend.Type) (int, error) {
return backend.PrefixLength(r.be, t)
}