package backend_test import ( "testing" "github.com/restic/restic/backend" . "github.com/restic/restic/test" ) type mockBackend struct { list func(backend.Type, <-chan struct{}) <-chan string } func (m mockBackend) List(t backend.Type, done <-chan struct{}) <-chan string { return m.list(t, done) } var samples = backend.IDs{ ParseID("20bdc1402a6fc9b633aaffffffffffffffffffffffffffffffffffffffffffff"), ParseID("20bdc1402a6fc9b633ccd578c4a92d0f4ef1a457fa2e16c596bc73fb409d6cc0"), ParseID("20bdc1402a6fc9b633ffffffffffffffffffffffffffffffffffffffffffffff"), ParseID("20ff988befa5fc40350f00d531a767606efefe242c837aaccb80673f286be53d"), ParseID("326cb59dfe802304f96ee9b5b9af93bdee73a30f53981e5ec579aedb6f1d0f07"), ParseID("86b60b9594d1d429c4aa98fa9562082cabf53b98c7dc083abe5dae31074dd15a"), ParseID("96c8dbe225079e624b5ce509f5bd817d1453cd0a85d30d536d01b64a8669aeae"), ParseID("fa31d65b87affcd167b119e9d3d2a27b8236ca4836cb077ed3e96fcbe209b792"), } 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) }