func cas(kv kvdb.Kvdb, t *testing.T) {
fmt.Println("\ncas")
key := "foo/docker"
val := "great"
defer func() {
kv.Delete(key)
}()
kvPair, err := kv.Put(key, []byte(val), 0)
assert.NoError(t, err, "Unxpected error in Put")
kvPair, err = kv.Get(key)
assert.NoError(t, err, "Failed in Get")
_, err = kv.CompareAndSet(kvPair, kvdb.KVFlags(0), []byte("badval"))
assert.Error(t, err, "CompareAndSet should fail on an incorrect previous value")
//assert.EqualError(t, err, kvdb.ErrValueMismatch.Error(), "CompareAndSet should return value mismatch error")
copyKVPair := *kvPair
copyKVPair.ModifiedIndex++
_, err = kv.CompareAndSet(©KVPair, kvdb.KVModifiedIndex, nil)
assert.Error(t, err, "CompareAndSet should fail on an incorrect modified index")
//kvPair.ModifiedIndex--
copyKVPair.ModifiedIndex--
kvPair, err = kv.CompareAndSet(©KVPair, kvdb.KVModifiedIndex, nil)
assert.NoError(t, err, "CompareAndSet should succeed on an correct modified index")
kvPairNew, err := kv.CompareAndSet(kvPair, kvdb.KVFlags(0), []byte(val))
if err != nil {
// consul does not handle this kind of compare and set
assert.EqualError(t, err, kvdb.ErrNotSupported.Error(), "Invalid error returned : %v", err)
} else {
assert.NoError(t, err, "CompareAndSet should succeed on an correct value")
}
if kvPairNew != nil {
kvPair = kvPairNew
}
kvPair, err = kv.CompareAndSet(kvPair, kvdb.KVModifiedIndex, []byte(val))
assert.NoError(t, err, "CompareAndSet should succeed on an correct value and modified index")
}