Function order_book_snapshot 

pub async fn order_book_snapshot<M: OrderBookSource + ?Sized>(
    md: &M,
    id: &InstrumentId,
    depth: u32,
)

REST order book: the right instrument, the asked depth, sorted best-first, not crossed.

Checks on md.order_book(id, depth):

• the call succeeds and returns [brokapi_core::OrderBook::Snapshot] (not an increment);
• the book is for the requested instrument (same [brokapi_core::InstrumentKey]);
• both sides have at least one level;
• neither side has more than depth levels;
• bids are sorted from the highest price, asks from the lowest (equal neighbours pass);
• the best bid is strictly below the best ask.

The mock must serve both sides for id and respect depth.

Panics

With [conformance:order_book_snapshot] <reason> when a check fails or order_book returns an error.

Examples

brokapi_conformance::order_book_snapshot(&md, &sber, 20).await;

A scenario that fails stops the test with its name and the reason. Depth 0 is something no book can satisfy, so this one panics:

// panics with a message that starts with [conformance:order_book_snapshot]
brokapi_conformance::order_book_snapshot(&md, &sber, 0).await;