AlwaysSuccessfulCollatCheckFn is a collateralization check function that always returns success.

CreateCollatCheckFunction creates a collateralization check function that can be used when calling the `PlaceOrder` function on the memclob.

CreateSimpleCollatCheckFunction creates a collateralization check function that can be used when calling the `PlaceOrder` function on the memclob.

HasMessage checks if OffchainUpdates contains an message for the given OrderId & OffchainUpdateMessageType.

MessageCountOfType counts the number of messages in OffchainUpdates of a given type (Place/Remove/Update).

OrderSideHumanReadable is a testing observability function that translates the boolean side of an order to a human readable string.

CollateralizationCheck is a testing utility struct used to represent a collateralization check.

TODO(DEC-1629): Remove FakeMemClobKeeper struct.