DpExchange.Robinhood.Fake (DpExchangeRobinhood v0.2.3)

An in-process Robinhood, for a consumer's tier-1 tests and for the conformance suite.

It is not a mock. A real implementation of DpExchange.Core.Venue answering from memory, running the same conformance suite as the real adapter.

What it models that is specific to this venue

Credentials are required for market data, because the real venue signs every call and has no anonymous endpoint. Without them: {:refused, :missing_credentials}.
Coverage is :internal_poll, not :stream — the one place a consumer can see that this venue has no socket, and it shows up as what is arriving, never as how.
No candles, no order book, no volume. The venue serves none, so neither does this.

Failure injection and anonymous mode

Every function below that has a real success path (not an unconditional Venue.not_supported()) checks DpExchange.Core.FakeInjection.next_outcome/1 or /2 first — a queued or always-set outcome from FakeInjection.queue_failures/2,3 or fail_always/2,3 short-circuits the fake's normal logic and is returned as-is. authenticated/1 also checks FakeInjection.credentials_bypassed?/1 before its normal {:refused, :missing_credentials} path. Neither changes anything for a test that never calls FakeInjection — see that module for the full contract.

subscribe/2, unsubscribe/2 and update_symbols/2 are NOT wired: each takes a list of symbols in one call, and "this one symbol in the batch fails, the rest succeed" is a case whole-call injection cannot express — see FakeInjection's own moduledoc.

Summary

Functions

coverage_by_kind(opts \\ [])

coverage/1, split by kind. Same single-key shape as the real venue, and for the same reason: get_top_of_book/2 above is this fake's only source of subscription data and it produces exclusively Types.TopOfBook, so :top_of_book is the only kind there is to report — see DpExchange.Robinhood.coverage_by_kind/1 for why the family requires this callback even where a venue has nothing to split.

Functions

coverage_by_kind(opts \\ [])

@spec coverage_by_kind(keyword()) :: %{
  required(DpExchange.Core.Capabilities.data_kind()) => %{
    required(DpExchange.Core.Venue.symbol()) => DpExchange.Core.Venue.route()
  }
}